# Questions tagged [analog-filter]

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### Is there an analog circuit that rounds voltage or current to digital-like values?

Is there a simpler circuit than basically using an ADC followed by a DAC for this?
56 views

### Can you help me understand this transient output of this universal biquad filter? My Bode plot proves that the filter is working perfectly [closed]

I am designing a universal biquad filter in LTSpice and ASLK Pro board with a square wave input: I have taken the Q factor as 1. I'm not convinced it is right. Is it as simple as the ratio of RQ/R6?...
46 views

### LHP zero in voltage buffer compensated opamp

I am observing a LHP zero for the following miller compensated opamp with a unity gain buffer in the miller feedback loop. I am not intuitively being able to analyze the source of this zero. Would ...
145 views

### How do I calculate how to change the cut off frequencies of this bandpass filter? [closed]

I am trying to find the transfer function of this filter to change the cut off frequencies later. When I do the calculations the traditional way the equation is very long and messy. Maybe there is ...
117 views

### Low-pass filter in SPICE [closed]

I have a simple question about a low-pass filter. Without a load I have a resonance effect. /!\ I forgot to delete a modification on the previous screenshot the 0.5 Ohms resistor after V1 that's my ...
1 vote
143 views

### Removing DC in Analog Filter

Overview I am working on an analog circuit that accepts input from four differential microphone inputs, amplifies, completes some basic filtering, and outputs a single rudimentary average of the ...
41 views

### Digital adjustment of the gain of the cut-off points of the analog filter

As seen in the graph, I have a bandpass filter. The problem is that the signal gain decreases at the cutoff points, but I want my gain to create sharp corners, including the cutoff frequencies, and I ...
• 756
1 vote
82 views

### Remove 50Hz noise from a system

I am working on measurement circuitry and one of the challenges I have is the 50Hz noise. Is there some analogue circuitry that could be implemented to eliminate this? I am using multiple LDOs to ...
1 vote
70 views

### Problem with analog passive lowpass filter

I designed a lC low pass filter and instead of getting a frequency response of lowpass, I got a strange frequency response as mentioned in the figure below. Does anyone have an idea ? The circuit: ...
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51 views

### HP filter for MHz pulses

I need a high pass filter for my measuring setup and I'am a total newbie to analog filters. I have weak hf pulses (0.5-1.2 MHz, 10 mV) superimposed on lf sine wave (8-40 kHz, up to 5 V), I'm ...
1 vote
120 views

Theoretical question: I have seen in many analog signal circuits that the analog input pin is pulled down through a resistance. Sometimes it is also pulled up and sometimes there is a capacitor ...
66 views

### Analog filter gain in simulation is not as expected

I want to have a 1 stage analog active filter with a cutoff frequency of 26 kHz. I used the MATLAB analog filter design toolbox to create such a filter. The filter that was provided by MATLAB looks ...
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159 views

### Bessel filter: explicit calculus of the order of the filter

As it is well known Butterworth and Chebyshev filters have explicit ways of calculating the order, derived by its polynomials. For instance, for Butterworth filters:  n \geq \displaystyle \frac{\log\...
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1 vote
218 views

### Confused about the sampling rate of AD7606-4 (analog to digital converter)

I'm using an AD7606-4 which is connected to an STM32 EVB. The connection is in the serial configuration and samples only 4 channels (DOUTA only). The sampling rate in the datasheet is 200 ksps, but I ...
• 441
348 views

I'm trying to design an audio mixer for my friend, and he only needs three stereo channels with volume for each channel as well as a master volume. Additionally, he'd like as high an audio quality as ...