Active Filter IC Distributor in China

RANTLE Active Filter IC can be configured for a wide range of low pass, high pass filters. It uses a classic state variable analog architecture with an inverter amplifier and two integrators.

By using RANTLE Active Filter IC, your amplifier will achieve the improvement of the predictability and performance of the filter.

RANTLE offers all kinds of Active Filter IC. We have Active Filter IC presents continuous time and switched capacitors filters that offers flexibility as well as being easy to use.

They are suitable for use in Phased locked loop, smoothing filters, discrete RC active filter replacement and many more applications.

RANTLE Filter IC is a positive voltage, low noise power filter capable of sourcing a 1-A load suitable for quiet supply solutions. It provides voltage regulation across the input and output terminals with high efficiency and power supply rejection.

RANTLE Active Filter IC uses a classic state-variable analog architecture with an inverting amplifier and two integrators.

The integrators include on-chip 1000pF capacitors trimmed to 0.5%. This architecture solves one of the most difficult problems of active filter design, the obtaining tight tolerance, and low-loss capacitors.

RANTLE Active Filter IC provides 330 mV of input to output voltage regulation if no resistors have been used.

Our Active Filter IC are precisely machined and tested to meet high-quality standards. RANTLE became the best supplier of electronic components coupled with reliability and trustworthiness.

RANTLE offers accurate quotation, excellent credit, reasonable price, reliable quality, fast delivery, and authentic service. For almost 16 years in the industry, RANTLE won the praise of the majority of the customers.

RANTLE Active Filter IC is made up of carefully chosen materials and technology. Hurry and avail now our Active Filter IC and experience its best performance.

We warmly welcome people from all over the world to contact and cooperate with us.

Electronc Components IC Chips Related Components: Logic IC , Interface IC ,  Equalizer IC ,  Driver IC ,  Digital Potentiometer IC , Counter IC ,  Network IC , Timer IC , Multimedia IC ,  Optocoupler IC ,  Power Management IC ,  Security IC ,  Switch IC , RF Integrated Circuit , IC Batteries

Related Electronic Components:  MAX3232EUE , AFBR-57J7APZ , TB62705CP , AD694JN

Active Filter IC: The Ultimate FAQs Guide

Today’s guide will answer all questions you may have about active filter IC.

From active filter components, working principle, troubleshooting process, specifications to features, you will find everything here.

Take a look:

What is an Active Filter IC?

An Active filter Integrated Circuit is an analog electric circuit with active components designed to filter electronic signals.

It amplifies some frequencies and at the same time weakening others in a signal.

Basically, an active filter IC will separate important frequencies from insignificant or disruptive frequencies in a signal.

These types of filter ICs are key components in many applications.

They are useful in radio communication, power supplies, and audio electronics applications.

These ICs require external sources of power that are helpful in amplifying or boosting the output signal.

Which are the Components of Active filter IC?

Active Filters Integrated circuit design consist of two important components namely:

• Active components
• Transistors
• FETs
• Operational amplifiers
• passive elements
• Resistors
• inductor
• Capacitor

Active filter

Which are the different types of Active Filter IC?

There are four essential types of active filter ICs which include the high-pass filter, the low-pass filter, the band-stop filter (or notch filter or the band-reject), and the band-pass filter.

Please note that terms “low” and “high”, as the names suggest, do not indicate the frequency value of the filter IC.

The terms are comparative values applied to frequency levels.

Types of active filter graphs

1. Low-pass Filters

Low-pass filters are circuitry that supplies consistent low-frequency output (gain) within the cutoff frequency.

It operates by blocking all frequencies above the cut-off frequencies.

2. High-pass Filter

A high-pass filter is complementary to the low pass active filter IC.

It maintains constant high-frequency supply at a level greater than the cutoff frequency by obstructing all the frequencies less than the cutoff frequency.

3. Band-pass Filters

Band-pass filter IC allows a medium frequency band to go through while blocking both the low and high

Frequency Band.

4. Band-stop Filters

In this active filter IC type, a Specific band of frequencies gets rejected and allows the passing of frequencies outside the band.

Band-stop filters function by blocking the medium frequency while allowing both the low and high frequencies to go through.

What are the uses of the Active Filter Integrated Circuit?

Active Filter Integrated Circuit has a lot of practical applications in electronics including;

· DC Power Supplies

In the power input and output supply system, these type of filter IC is used to eliminate high frequencies thus reducing humming noise.

· Radio Communications

Active Filter Integrated Circuit is used in Transmissions and Receivers of Radio signals.

They are very important for searching or tuning to specific frequencies in the radio.

They help to reduce noise and provide clear reception of radio signals.

· Analog-to-digital Conversion

The filters are helpful in converting data from analog to digital.

· Audio Electronics

In a crossover network you can use active filter ICs to channel high-frequency sounds to tweeters medium-range frequencies to loudspeakers and low-frequency audio to woofers.

Moreover, they help in controlling tones, act as volume equalizers, and pre-amplification in sound systems.

· Medical Equipment

Medical electronic systems and categories of equipment also consist of active filter ICs.

What is the Difference between Active and Passive Filter IC?

Here is what you should note:

a) Components

Passive filter ICs consist of passive elements like inductors, resistors, and capacitors whereas active filters integrated circuits comprise of active elements including transistors and operating amplifiers for filtering signals.

b) Power Supply

You need an external power source inactive filter ICs, however, there is no need of a source of power in passive filters.

c) Frequency Range

Passive filters operate within a limited frequency range between 100 Hz and 300 MHz.

At lower frequencies, the passive filter IC is limited by its design, which would require it to have large inductors and capacitors.

Parasitic effects of capacitances and inductances are the major limiting factor beyond the upper-frequency range.

However, the use of passive filters in the Gigahertz range can be achieved by engineers properly designing the circuit.

d) Low Frequencies

 Frequencies close to 0 Hz and voltage gain can be achieved by the use of active filter IC which is not possible with passive filters, which are suitable for radio frequency circuits.

Very high-frequency usage is not ideal for active filters because of the amplification bandwidth limitation.

e) High Order Filter Design

High-order filters design can be achieved in active filters without incorporating inductors in the design.

Producing an integrated circuit with an inductor as one of the components is a big challenge to manufactures.

What is the Importance of Universal Active Filter ICs in IoT systems?

The conversion of an RF signal or sensor to digital in the design of IoT appears to be very simple but in reality, this is quite the opposite.

Aliasing needs to be prevented by band-limiting the analog input signal by using an analog to digital converters (ADC).

Also, harmonics have to be reduced and spikes need to be eliminated by filtering the digital to analog (DAC) outputs.

The design in terms of roll-offs, filter type, reliability, and accuracy is very challenging.

This challenge is compounded by limits in analog experts and marketing time.

You can incorporate universal active filters ICs in the system to enhance performance and to fulfill the requirement of the designs.

In order to overcome the challenges of band limitations, analogs are filtered by using standard building blocks for analog filters.

The standard building blocks provide fast design cycles, effective band limitation, and flexible filter topologies.

What is -3dB Frequency and Center Frequency in Active Filter IC?

The -3dB frequency is simply known as the cutoff frequency.

At cut off frequency power output is reduced by half.

Therefore, -3dB frequency can also be referred to as the “half-power frequency”.

It can be represented by a simple mathematical formula – input voltage X 1/√2= output voltage.

Band-pass (f₁) and notch filters (f₂) are two -3 dB frequencies. In addition, both low-pass and high-pass filter ICs have a single -3 dB frequency.

The center frequency ( f₁ and f₂ ) is the geometrical mean or arithmetical mean of the upper cutoff frequency and lower cutoff frequency.

It is centrally located between the two frequencies.

What is the Importance of Quality Factor Q in Active filter ICs?

Quality factor (Q) is the ratio between the -3dB bandwidth and the center frequency in a band-pass or notch filters.

The damping characteristic of an active filter IC is represented by its quality factor.

Damping in the time domain is equivalent to the amount of oscillation in the step reaction in a system.

A Higher Q factor in a domain frequency is a result of many positive or negative peaks in a system’s enormous reaction.

What is the Role of UAF42?

UAF42

The UAF42 is a universal active filter integrated circuit which has a wide range of applications in different filters: band-pass, high pass, and low pass filters.

The designer of UAF42 solved the most difficult challenge of obtaining low loss capacitors and tight tolerance in active filter design.

A combination of classic state variable analog architecture, two integrators, and an inverter amplifier is used in the manufacture of UAF42.

On-chip 1000pf, 0.5% capacitors make up the integrators.

Being a DOS-compatible active filter IC design, it permits easy execution of Bessel, Butterworth, Chebyshev and other filter types.

You can integrate a fourth uncommitted FET-input operational amplifier.

It is similar to the other three, which is useful in the formation of extra stages or for special filters like inverse chebyshev and band rejects.

The UAF42 is designed as a 14-pin plastic DIP and SOIC-16 surface-mount package, with a wide temperature tolerance between –25°C and +85°C.

Its classical design provides continuous filter properties devoid of problems and switching noise common in capacitor filter type.

What are the Benefits of Universal Active Filters IC?

• It is possible to modify the gain and cutoff frequency of a filter as needed.
• With the use of Universal active filter building block IC’s, it is possible to accurately design and manufacture a variety of filters to suit different needs.
• Universal active filter IC gives four outputs: band-reject, high-pass, low pass-band and band-pass filter ICs.
• Compatibility: its small size with the ability to provide 4 different filters from a single input.

How do you Troubleshoot Active Filter IC?

Troubleshooting inactive filter integrated circuit can be broadly classified into two:

Active filter IC

DC Problems

Abnormal behaviors of DC voltage levels in the output of the operational amplifier are generally tackled as follows:

1. You need to ensure the proper connection of the positive and negative terminals. Ensure that they are directly coupled on the right pins of the operating amplifier.
2. Check whether voltage levels are correct.
3. Check the polarities of the different input voltage against the output polarity pins.
4. If polarities are incorrect, then suspect the operational amplifier
5. If polarities are correct, then measure DC input voltage.  Abnormal DC level may appear as a result of abnormal levels from the prior stage.
6. If everything seems okay then check and verify feedback circuit integrity.
7. If the feedback circuit is open operational amplifier voltage output will be different from the expected.

AC Problems

1. When the DC voltages are precise yet the active filter IC is not working properly, then check the elements that determine the frequency.
2. When there is a slight shift in the cutoff frequency or resonant frequency then there might be a modification in the values of elements.

• In case of an extraordinary alteration in the AC functioning of the IC then there might be an open component.

1. Normal DC values and abnormal AC values are an indication of an open capacitor or a resistor isolated from DC.

It is crucial to understand inactive filter integrated circuits troubleshooting to:

• Understand the correct function of the circuitry.
• Carry out a regular comparison of the actual implementation against the anticipated performance.

What are the Advantages of Active Filter IC?

Active filter ICs have some definite advantages that include:

• They have the capacity to give signal gain.
• Uses a single or more active component like an amplifier. The incorporation of an amplifier, usually having negative feedback, substantially modifies the performance of the filter.
• The use of amplifier(s) improves the stability of active filter ICs and eliminates costly inductors.
• Have high input and low impedances in output that facilitate more efficient relations with preceding and succeeding stages.
• Excessive loading does not affect this type of filter ICs.
• Allows modification of certain parameters using affordable variable resistors.

Which are the Specifications to Consider when Designing an Active filter IC?

Active filter circuit

Before utilizing or choosing filter ICs, you have to understand how to specify them.

Here are the key parameters to consider when you specify an active filter integrated circuit:

· Cutoff Frequency

It is described as the frequency (ƒ_C) where there is half the power of the input signal at the output signal.

This is instrumental in specifying the end of pass-band and beginning of stop-band.

The cutoff frequency is also known as the –3 dB frequency since –3 dB is equal to a one-half power ratio.

· Bandwidth

When an active filter IC rejects or passes only a spectrum of frequencies working as both low-pass filter and high-pass filter, it will have two cutoff frequencies.

The lower one is ƒ_L and the higher is ƒ_H. Therefore, the bandwidth of the filter is ƒ_H – ƒ_L = n kHz.

· Ripple

Defined as the variance in attenuation of the input signal in the stop-band or pass-band of the active filter IC, and is designated in dB.

· Rolloff

Described as the active filter IC response gradient in the transition area separating stop-band and pass-band.

It is designated in dB per decade or dB per octave. In case the response changes rapidly with frequency, it will be known as steep.

· Insertion Loss (IL)

The lowest attenuation in the pass-band of the filter.

An ideal filter would not have insertion loss, however, all practical active filter ICs to some extent have insertion loss.

· Stop-band Notch Depth and Attenuation

The active filter IC requires a minimal amount of attenuation in the stop-band.

If the IC rejects a small scope of frequencies with a stop-band in the middle of two pass-bands, the maximal attenuation between the pair of pass-bands is the notch depth.

Both of these variables are denoted in dB.

· Input and Output Impedance

Active filter ICs have a distinctive impedance that influences the performance of a signal load or source when linked to the integrated circuit.

The impedance needs to equal the impedance of the device the filter is linked to for it to have only the required effects.

Also, the active filter chip may not perform as desired in case the impedance does not match.

What are the Features of Active filter ICs?

• Enables setting of the quality factor (Q), the tuned frequency, and shape of response using affordable variable resistors.
• The adjustment of one parameter does not affect others.
• It can have sophisticated zeros and poles without utilizing a bulky or costly inductor.
• Applies a single or multiple active components like an operational amplifier.
• Need a power supply to run amplifier elements.
• Have a restricted bandwidth and are usually unsuitable at high frequencies.

Which are the Electronic Filter Topologies used in Active filter ICs?

Some of the most common topologies include:

· Sallen-key Topology

This is a filter configuration essential in executing second-order active filter integrated circuitry that is particularly favored owing to its user-friendliness.

It is usually a degenerate kind of voltage-controlled voltage source layout.

Normally, a VCVS active filter integrated circuit applies a super-unity-gain voltage amp with no output impedance and infinite input impedance.

These filter IC types can execute a 2-pole high-pass, band-pass or low-pass response.

The type of amplifier used in VCVS topology facilitates gain in the high-pass band and quality factor without the need of an inductor.

Nevertheless, active filter ICs employing Sallen-Key configuration applies a unity-gain amp. This is an authentic buffer amplifier that comes with a gain of 0 dB.

· State-variable Filter Topology

This is among the most flexible filter topologies you can find.

State variable active filter ICs employ three or several operational amplifier circuits arranged in a sequence to generate the output of individual filters.

Nonetheless, it needs an extra summing amplifier to generate an output response of a fourth notch filter.

Filters applying state-variable filter topology are considered as second-order active filter ICs comprising of a pair of similar op-amp integrators.

Each integrator functions as a first-order, single-pole low-pass filter IC – a summing amplifier through which you can damping feedback network and gain of the filters.

This topology feeds back all the 3 op-amp phases output signals to the input enabling you to determine the state of the circuit.

The main advantage of a state-variable filter IC design you can set.

Alternatively, you can adjust independently the main parameters of all the three filters (Gain (A), filters Q and corner frequency, ƒ_C) without impacting on their performance.

Nevertheless, the main disadvantage of state-variable active filter ICs is that they need a number of op-amps compared to other topologies like Sallen-key filter designs.

· Dual Amplifier Band-pass Filter Design

This topology is instrumental in designs that need high frequencies and quality factors.

Double amplifier band-pass active filter ICs have low element spread and sensitivity.

One of the main advantages of this active filter topology is that it allows independent adjustment of the resonant frequency and Q.

Active filter ICs applying this topology has a simple design, though it is hard to determine the values for a specific set of parameters.  These types of active filters are instrumental in analysis, equalization, and other operations like a totally functional Vocoder or sound-to-light converter.

· Wien-Bridge Topology

This is a bridge circuitry comprising of four arms with one arm having a resistor in series with a capacitor and another arm constituting a resistor in parallel with a capacitor.

The other two arms generally have a resistor on each. Often, you can use a Wien bridge to measure undetermined capacitance values, even though you can as well use it as an active filter IC.

In Wien bridge filter topology, it is possible to select and adjust the components so as to balance it at a specific frequency.

When balanced, the responsive impacts of the capacitors in the circuitry counterbalance each other, leaving the two nodes at the same potential.

You should note that this bridge balancing happens only at one frequency.

· Butterworth Filter Topology

In this topology, the design of the active filter IC is in such a manner that it ensures a response to frequency as flat as practical in the pass-band.

They are also known as maximally flat magnitude active filter ICs.

Butterworth is one of the popularly utilized digital filters helpful in motion analysis because of they quick and straightforward to use.

You can easily understand and predict the impacts of filtering because they are based on frequency.

Furthermore, it is easier to choose a cutoff frequency in Butterworth active filter design.

· Akerberg-Mossberg Filter Topology

This electronic active filter IC topology is ideal for applications that need low noise, low voltage low-pass and high-pass active filters.

The configuration facilitates easy implementation of the filter variables even it has challenges with internal stability.

Also, the instabilities are as a result of the internal integrator.

Is there Difference(s) between Notch Filter and Band-stop Filter?

No, notch filters are a form of band-stop filters designed to eliminate a very limited range of signals, normally just a sole-frequency tone as a result of the over-the-air carrier or spurious signal.

DSP notch filters have the ability to automatically detect the presence of the existence of the disrupting pulse and “notch it out”.

It does this even for multiple signals concurrently by applying current technology. On the other hand, analog notch filter ICs need manual adjustment.

What is meant by Active Filter Sensitivity?

You realize the desired functions by interlinking the components of keenly selected values in an active filter IC.

The modules are subject to modification because of aging, tolerances in fabrication and variations in humidity and temperature.

You employ the sensitivity principle to establish the change in the performance of the filter as result of drift or alteration in component values.

Therefore, the sensitivity of active filter IC is a measure of variation in some performance features of the circuitry.

This is due to some alterations in the nominal value of single or multiple components of the IC.

Generally, low-sensitivity integrated circuits are favored over high-sensitivity ones.

Is Active filter IC Attenuation Positive or Negative?

High pass filter graph

The dB ratio will be negative if the out signal of the filter IC is lower than the input signal.

For instance, in case the output is 5 times lower than the input, that is a -7 dB power ratio with the negative (-) sign denoting a ratio below 1.

That designates a loss or attenuation of 7 dB, without the minus sign.

The principle is that dB power ratios have either a negative or positive value, while attenuation or loss are specified with no sign.

The power ratio of -7 dB is attenuation or loss of 7 dB.

Likewise, in case the output was 5 times higher than the input, it would mean a gain of 7 dB.

You do not us the negative sign if the parameter name signifies if it is available or not.

Does Filter order have Effect on an Active Filter Design?

The order of an active filter IC has various effects on its design.

It directly affects the number of modules in the integrated circuit and, thus, its cost and sophistication of the design function.

For that matter, high-order filter ICs are more costly, bulkier, and are very challenging to design.

However, the main advantage of higher-order active filter ICs over lower-order filters is the fact that they have a sharper roll off gradient.

With the information in this guide, you can easily choose a suitable active filter IC.

However, in case you have any questions about active filter integrated circuits, you can contact us now.