A filter modifies signals based on their frequency.

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3 views

How does the ELPF and XTAL inputs on the ADV7180 recommended circuit work?

I am looking at the recommended circuit for the ADV7180 by Analog Devices and trying to understand some of the reasoning behind the design choices. I realize some of these questions may be a lack of ...
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0answers
17 views

how to processing the IF signal ? and how to filter the ghost target? [on hold]

I am developing a FMCW radar level ? I am not clear that the how to processing IF signal using mcu ? how to filt the false signal ?
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3answers
70 views

What do these two omega's say about this filter?

I've got the filter that's given in the picture below, they calculate the pole and the zero of the transfer function but what do these two values for omega say, is it kind of a cut-off frequency? (...
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1answer
36 views

What functions do EMC filters in variable frequency drives serve?

Most VFDs I've seen have EMC filters in them, though in many cases they're optional or can be disabled by the user. Exactly what function do these filters perform? What problem are they intended to ...
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0answers
25 views

Analytically Deriving butterworth Filter [on hold]

I am pretty new to Digital Signal processing, i did my back end research, but i was overwhelmed by the different variance of the solutions i got. I want to Analytically derive a butter worth filter ...
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1answer
61 views

Designing Butterworth Filter [on hold]

I want to design butterworth filter in matlab only based on order of the filter and the cutoff frequency in Hz. the syntax is for returning the ABCD matrix of statespace is ...
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0answers
51 views

How do I analyse this bandpass filter? [closed]

I tried several times but cannot get the same frequencies as the filter. Any help would be much appreciated. Or if I need additional info please let me know.
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1answer
48 views

How to modify this tank circuit to obtain a 3rd order passive band pass filter?

I am very confused about band pass- and band rejectfilters. I have this circuit which represents a bandpass filter. A 2nd order (2 energy exchanging elements) bandpass filter if I am not mistaking: ...
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3answers
148 views

Why filter through hardware?

I am trying to measure a signal with a voltage amplitude between 10-100 microvolts and a frequency between 7-30Hz. The guide I am following suggests filtering out 60Hz noise using a notch filter, as ...
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1answer
37 views

Notch filter ECG

I am using the Sparkfun Development kit based on AD8232 for acquiring the ECG signal from the body. Sparkfun Kit. Now I am getting a perfect ECG signal when I turn off all the power in the house and ...
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2answers
51 views

How good should the regulated AC/DC power supply filter be in tube headphone amp?

I am building a tube headphone amplifier. I built a AC/DC regulated power supply (220v AC to ~250v DC) but I am not sure about how good is the filter. The filter contains 120uF and 68UF capacitors, in ...
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2answers
40 views

What is the meaning of |H(jw)| concerning the transfer function

Noob question here but my books talks about the magnitude of the transfer function |H(jw)| a lot but I don't understand the meaning of |H(jw)| itself. Because of this I can't interpret the meaning of ...
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4answers
98 views

How/Why Do Bode Plots Work?

So when you derive the Bode Plot from the transfer function you plug jw into the transfer function H(s). You then get the magnitude of H(jw) and plot it to get the Bode Plot. My question is why does ...
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1answer
44 views

Active highpass filter design?

How can I design an active highpass filter with |T(0)|=0.1 and |T(inf)|=1 and one critical frequency (either a pole or a zero) at 200 Hz?
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2answers
74 views

filtering 12vdc power [closed]

I have a power supply that outputs 12 V DC when it is connected to 119 V 60 Hz AC supply. However I am getting high ripple of 1.5 volts peak to peak. I think the power supply circuit already has a ...
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0answers
26 views

Inital condition for 1st order derivative

I have a PT2 system filter, $$Y'' = a_0*Y'+a_1*Y+b*u$$ I want to apply this filter to my signal, i have a problem in deriving initial condition for 1st order ...
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1answer
65 views

Low pass filter output

I have a weird but annoying problem. I have an inverting low pass filter as in the figure below: simulate this circuit – Schematic created using CircuitLab I want this circuit to act as ...
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2answers
50 views

Why is the capacitor voltage Vin*D?

I'm trying to understand turning a pwm signal to a analog signal. From what I saw online I found that using a lowpass filter, the capacitor voltage is Vin*DutyCycle. This was given as a fact and I ...
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2answers
62 views

How can we calculate the transfer function from this filter?

I'm trying to calculate the transfer function of this high pass filter : So basically I'm trying to find how I can find \$V_{\text{out}}\$. Due to the amplifier we know that $$V_{in} = V_{\text{...
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2answers
54 views

Do narrow-band single-chip bandpass filters for audio frequencies exist?

I am looking for a single-chip implementation of a bandpass filter for audio frequencies, but unsure if they even exist. All the filters I've seen seem to be at least in hundred KHz range. So my ...
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2answers
31 views

Optimization of component values in LPF

I'm designing a 2nd order low-pass Butterworth filter using a Sallen-Key topology (for reminder) : simulate this circuit – Schematic created using CircuitLab Now, I am trying to find the ...
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2answers
107 views

LC circuit in radio receiver

Why is it required in radio receiver to tune the LC circuit to the the resonant frequency of the station in order to receive the station ? How this tuning filters the desired signal from the other ...
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4answers
81 views

Advantages of filtering signals using analog or digital methods?

In my understanding, it seems that there are, broadly speaking, two primary ways in which signals are filtered for analysis by computers, which are software-side filters and hardware-side filters (...
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2answers
40 views

What is the Kuroda method for transmission lines and why is it usefull? [closed]

I recentrly heard about the Kuroda method (when speaking about transmission lines) but didn't understand what it really is and why it might be usefull. Could someone give a brief explanation? why ...
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1answer
53 views

discrete high order filter (passive?) [closed]

Well, not completely passive. But not what's usually meant when one uses the words 'active filter'. It's going to be a filter that consists only of discrete transistors, capacitors and resistors. ...
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3answers
838 views

Are there any quick way to tell if a filter is high-pass, low-pass, or band-pass, just by looking at the transfer function in the s domain?

How can I quicly determine if a given filter's transfer function like: \$ H(s)=\frac{k}{s^2+ks} \$, or \$H(s)=\frac{1}{s+k}\$, is either a low-pass, high-pass, or band-pass ?
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84 views

Decoupling Capacitor (High Frequency Spike)

Wondering if anyone could help me rectify my understanding of decoupling capacitors and their role in suppressing high frequency voltage spikes (particularly increases in supply voltage). Similar ...
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3answers
78 views

Why are ratios relevant, but not the increments when defining center frequency of a band-pass filter?

First of all, here is my directly related previous question: Why is center frequency of a bandpass filter is given by the geometric average of the two cutoff frequencies? Olin Lathrop explained very ...
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2answers
39 views

high frequency noise from multiple feedback op amp

I've built a multiple-feedback low-pass filter with a TL084IN op amp. I've simulated the filter for the chosen R and C values using LTSpice and it looks like I was expecting: . I've also assembled ...
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1answer
29 views

Can I use barrier rectifier as a diode in bulk converter circuit?

I have this LC circuit which will work under 12V and quite high load (10-20A): The diode D1 must be a shottky diode but the only similar thing I have at the moment is actually 3-leg MBR3045CT ...
2
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3answers
484 views

Using LC filter instead of RC filter in mains powered circuits

Above is a dimmer circuit. In some of these circuits I see a toroid inductor together with a capacitor forming a low pass LC filter which is called choke filter. My questions are: Why is RL used ...
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1answer
45 views

Are the terms corner frequency,cutoff frequency and break frequency the same?

I am studying electronics engineering and I came across these terms..how are these terms different from each other?
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4answers
50 views

Remote Controlled Vehicle Design

For our term project we have to design a vehicle which has to have three functions; move forward, turn left and turn right. The vehicle will have two dc motors that will work at the same speed for ...
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1answer
56 views

Avoiding electrolytic capacitors in high-pass filters with sub-Hz cut-off

We need to design a HPF filter to AC couple a bipolar signal to a high gain amplifier. Any substantial DC left would saturate the amplifier, and thus it must be removed with the high-pass filter(HPF)....
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26 views

Active damping for Application in High Power with LC-filter

I am working on a circuit which consists of inverter subsequent by a filter as shown in the figure, the filter consists of LC and RC as branch for the filter. I have gotten after the filter a ...
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1answer
48 views

RC filter with an square wave input (checking my math and find my error, if it is somewhere) [duplicate]

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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1answer
60 views

RC filter with an square wave input

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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1answer
38 views

DC-LVDT Output noise filtering

I am working with the DC-LVDT Omega 620-25 http://www.omega.com/pptst/LD620.html Manual: http://www.omega.com/Manuals/manualpdf/M4345.pdf Specs: http://www.omega.com/pressure/pdf/LD620.pdf I am ...
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1answer
38 views

Narrow bandpass filter using maximally flat LPF prototype design

I'm doing a project involving wireless power transfer, where an LED will be turned on via 2 induction coils (tx and rx). The interfacing power circuitry for this has already been figured out (an ...
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2answers
54 views

Is it OK to combine passive and active filters?

I am a newbie to filter design. I would like to know: is it common to use a first step active filter followed by five or six passive LC-filters for very high orders? Or do people usually don't combine ...
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1answer
17 views

MAX7414 low-pass filter OS pin

The datasheet of the MAX7414 low-pass filter shows the OS pin connected to a voltage divider to set the output offset when the IC is used on a single rail supply. Can the OS pin be supplied by the ...
0
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1answer
79 views

How to simplify opamps in circuits for limit analysis

I know that when simplifying electronic circuits for limit analysis you can e.g. replace capacitors with closed lines and coils with open lines. e.g.: the equivalen at high frequencies would be: ...
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92 views

Circuit for voltage division and DC shift doesn't work

I've connected the circuit below on a breadboard and tested it in the lab: Components: \$R_{1}=1\,M\Omega,\;R_{2}=40\,k\Omega,\;R_{3}=R_{4}=R_{5}=R_{7}=R_{8}=20\,k\Omega,\;R_{6}=49.9\,k\Omega\...
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3answers
79 views

Understanding Ferrite Chokes

I am looking to clean up the power supplied to a video transmitter on the UAV I am building. The video transmitter consumes about 200mA of current at 16V DC. The 16V line has noise from motors and ...
0
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1answer
91 views

What is the purpose of resistance & capacitance in parallel to Load ( refer ckt )

What is the purpose of resistance & capacitance in parallel to Load ( refer ckt ) ? As per my understanding these capacitor & resistor is for filtration purpose ( kindly clarify the same) . ...
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1answer
43 views

Cut-off frequencies for common mode and differential mode filter?

Attached is the circuit section for the differential signal amplification. The circuit is comprising of common mode and differential mode filter capacitors.So there will be two different cut-off ...
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1answer
68 views

What happens if you put two coils in parallel

I want to build an LC-Filter from a tutorial I found (German language, if anyone is interested, I'll add a link). In that tutorial, a 330uH Coil with a max amp of 1A is used. I have some 330uH ...