# Questions tagged [filter]

A filter selectively processes input signals in frequency- or time-domain.

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### What are non-reciprocal bandpass filters?

I am not an electrical engineer. I have come to know about a term called as "Non-reciprocal Bandpass filters" which seems to be useful to me. Here are some links to the papers (unfortunately ...
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### How does load resistance affect RC low pass filter?

I am building a low pass filter. This is the equation I'm using to calculate what frequencies I want to pass though, but I have a couple questions on details. $$f_c = \frac{1}{2\pi RC}$$ What goes ...
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### Ripples in the passband of a SAW filter

In SAW Filters we have a phenomenon called TTE, Triple Transit Echos. How does this phenomenon render inband ripples different than in a Chebyshev filter? Am I also correct to assume that the ...
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### Why does this high pass filter behaves like band-pass filter on Multisim AC Sweep simulations?

I have this high-pass filter schematic and its AC Sweep simulation. Until the break through the end, the graph is right but I can't see why the graph breaks on the right hand side and filter behaves ...
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### Median Filter FPGA [duplicate]

I trying to build on my FPGA project median filter for 1-d vector, I need my median filter to be large, the Internet is full with references for 9 points median filter but didn't saw anything for ...
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### Decoupling capacitors inrush current

My question relates to decoupling capacitors on power input rails. I see a lot of designs with MCU boards that use only decoupling capacitors and no chokes, beads, inductors, or resistors. Isn't this ...
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### How can I calculate low and high frequency in my circuit?

How can I calculate low and high frequency in my circuit? I have used an 8-ohm speaker.
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### Why is component spread a figure of merit for analog filters design?

Sometimes I read that in analog filter design, component spread is a figure of merit. The lower the better. What is the advantage (or disadvantage) of having a low (high) component spread? The only ...
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### Second order differential equation implementation using OP-Amp

I am trying to implementat the following equation $$x''+4x'+25=\sin(20t+36)$$ using OP-Amp's. I tried to use state-space technique to implement it in the below circuit x ...
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### 27 points median filter

Edit: I successfully made it work, but the algorithm not efficient I taking the date coming in to my block, pipeline the data for how much points I need to median filter (for example 31), take all ...
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### Low-pass (band-pass) filter for op amp circuit

I have a circuit that amplifies a one-shot inductive trigger pulse of about 1.3Khz (@780 micro sec period) from about 10-200mV to about 3-4V. Between C1 and R3 there is a 0.13uH inductor coil with 11 ...
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### Chebyshev filter - theoretical vs simulation gain

Question is about the gain peak (or maybe more suitable would be growth) ocurring in higher frequencies (>20kHz) in Chebyshev filter 4-th order in simulation (simulated using Bode Analyzer in NI ...
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I have an ADC circuit which uses AD7689. The inputs of the ADC are driven by LT6010 opamp, and have a low pass filter . All 8 channels of the ADC (AD7689) have the same driving circuit. Every other ...
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### Determine output filter using the bode approximation

Given that the carrier frequency Fc and modulation input frequency Fm are known, how would I use the bode approximation to determine an output filter, if the carrier frequency component must receive ...
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### Problem understanding transfer functions of second order filters

The transfer function of any second order filter can be found by analyzing the circuit using the Laplace transform. For example the transfer function of a second order low pass passive RLC filter ...
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### How can I model an optical filter using python?

Say I have an RGB LED which transmit intensity modulated signals, at one symbol transmission I want to send a symbol with all three chips.. Can I just model three bandpass optical filters like RF ...
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### How to flter 70kHz signal with noise

I am trying to filter a noisy 70kHz sinusoide that goes from -2V to +2V. A factor 2 amplification should work. Any suggestion on which circuit to use? I tried to use an active bandpass filter ...
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### Output Voltage Ripple Considerations

I'm working on a full bridge dc-dc converter, following the instructions on power supply cookbook. It has a 350V output and 2kW total power, 30kHz switching frequency I choose inductor current ripple ...
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### Inverter EMI filter design

I'm designing an inverter with a switching frequency range of 10-40kHz. The inverter will run off of a DC power supply at a relatively low voltage (30-80VDC) and low power (~100W) for motor control ...
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### Why signal coming out of a Constant K filter takes 0.5ms to stabilize?

I made a simulation of an audio amplifier with an input signal of 200 microVolts. The question is why my filter does not deliver the desired output, which operates between 512 Hz and 2048 Hz. From ...
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### How to choose input filter component value for power supply

I understand that normally we'll modify the input filter after some measurement to meet the emission standard, but does anyone know on how we can estimate the initial value of this filter components ...
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### Choosing resistors in series to make standard values

I am working on designing a precision analog filter for a university electronics project. The resistance values I am using (to meet the filter specifications) are not E96 values, so I am combining ...
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### Is this output normal for a capacitor filter?

I have a question regarding oscillator outputs and capacitor filters. I'm trying to build a voltage regulator. I've already calculated and tested the transformer and rectifier, and also the filter ...