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I am trying to demodulate an analog video signal of PAL format and encountered a problem in demodulating the color part. So my input data is as follows: I have 2500 spectra, spectrum width 200 MHz, my ...
Женя Трикоз's user avatar
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I have a pulse train with a frequency of 1Khz. Its duty cycle can be anywhere between 5% and 95%. But the voltage level of the pulse can also change and that is the information I would like to convert ...
Monti's user avatar
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I'm working with Delta-Sigma modulation signals for audio ADC/DAC, and I'm curious if there is a best practice when it comes to summing their signals. Demodulation is generally achieved with a simple ...
paraparabolic's user avatar
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1 answer
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From Bluetooth Core spec: The modulation is Gaussian Frequency Shift Keying (GFSK) with a bandwidthbit period product BT=0.5. The modulation index shall be between 0.45 and 0.55. A binary one shall ...
Thanos's user avatar
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The incoming signal is a modulated carrier wave, right? If we only apply a low-pass filter to it, we will get an AC signal that can be passed to a speaker directly, right? Using a diode, we end up ...
Coykto's user avatar
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In the analog switch-based synchronous demodulation of a signal, say 1 MHz, how does the turn-on and turn-off time of the switch impact the demodulated and filtered DC output (demodulation here is ...
dhuwarkesh's user avatar
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This is how I designed the frequency modulation circuit, but I cannot perform the demodulation process. It can be done with a PLL but I couldn't install it. How can I demodulate?
Orhunemre's user avatar
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MattCG's user avatar
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When demodulating an AM waveform why is there a frequency spike on the spectrum analyser of exactly two times the carrier frequency with an upper and lower sideband. It is past the cut off frequency ...
Lost student's user avatar
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I'm teaching myself about polyphase clock sync for demodulation of OQPSK. An article from gnuradio.org entitled "Polyphase Clock Sync" makes references to a 2nd order loop. The context seems ...
James Strieter's user avatar
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I am simulating a block beta modulator, but the problem is to switch uses in that block. What component do I have to use in place of U3? I did not find this type of any component in LTspice library ...
Usha Kumari's user avatar
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1 answer
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I have an application with a 2D array of inductive sensors for position detection of an object on a plane. I have experimented with inductance to digital converters (https://www.ti.com/product/LDC1314)...
learnvst's user avatar
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I have been trying to decode the signal of a keyfob with a cheap 315MHz RF receiver (XY-MK-5V) and a ...
chubakueno's user avatar
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I demodulated a signal using this simple envelope detector. When I checked the output, the amplitude was decreased - it was not the same as the original signal that was modulated (from the forward ...
jbean's user avatar
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I'm doing an FM demodulator circuit. I am copying the circuit from LTspice in the first image) to Multsim (the second image.) Is what I did in Multisim correct? How can I get a graph from Multisim ...
janna urb's user avatar
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I can't remember the name of a demodulation technique I read the whitepaper on. My memory is not exact but I remember the following vaugely: Core to it is a 1:4 demultiplexer run at 4x the desired ...
foreverska's user avatar
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I came across an interesting IC that contains most components of a little lock-in amplifier (except output LPF) - ADA2200. I am curious however why they opted for such a design where instead of ...
Michał B.'s user avatar
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I have a csv file which contains the time and magnitude of the BPSK modulated waveform. I now want to demodulate this. Its bitrate is fc/128 (~106 kbit/s) and the carrier frequency is fc/16 (~847 kHz)....
tan45's user avatar
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I am trying to understand what kind of changes occur to a signal in the chips which sit between the tuner and, for example the FM audio demodulator. Take the attached example - the TDA2546A. It takes ...
Matthew Millman's user avatar
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Assume we have a simple AM signal, which is a mix of the carrier wave and upper/lower bands. If I were to plot its time domain graph, I would get a graph with Y being its amplitude and X as time, ...
Dan's user avatar
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I am working on a circuit project where I need an in-phase/quadrature mixer for acoustic signals in the range of 200 kHz. I have seen that there are a lot of ICs for radio frequencies that implement a ...
PeterO's user avatar
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I've designed following circuit: But let's completely forget the MOSFET and only focus on the optocoupler. The signal provided to the input of the optocoupler (yellow) has following characteristics: ...
Fox's user avatar
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2 answers
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My teacher has a demodulated signal and he removed the DC offset with this one line of code in MATLAB: y_dc = y - mean(y) Can someone please explain how this line ...
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This is not a math question. What I want to know is the physical implementation of the receiver where phase modulated signal is coming to the receiver. How does the receiver decide when the phase ...
onurkirmizi's user avatar
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5 answers
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This is an ASK asynchronous demodulator In the circuit, we can see 3 differentiated parts: One half-wave rectifier, one envelop detector and a comparator. The circuit receives SIG which is a ASK ...
john wickç's user avatar
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I am reading the operation of the ratio detector for FM demodulation. It works on the principle of diode variable damping (please see the figure here). The capacitor C9 restricts the changes in the ...
Userhanu's user avatar
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1 answer
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I have a question with regard to the differences between a PLL on a PCB and on a breadboard. In this test, I have connected the output of the amplifier (LMH6503) to both the PLL on the PCB and the PLL ...
Kwok's user avatar
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Here is what happened to me a few days ago: I own an amplified speaker with a jack plug. Usually, when I touch the jack plug with my finger I hear a "hum" sound. On this specific day, on a ...
J.Mayol's user avatar
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What is the possible value of V3 (voltage controlled switch) and the command to demodulate PAM signal?
Pro Ject's user avatar
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This is one of the exam questions I have come across with. My approach was, To be able to get detected by the envelope detector, $$A\geq |\max(m(t))|$$ Max value of m(t) is 1 right? When t = 0 we get,...
leahnanno's user avatar
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I am designing LPF based differential demodulator(LPF_DDM) to retrieve differentially modulated signals, which are on-chip capacitive isolated [shown]. LPF_DDM includes a differential amplifier, LPF, ...
Bam_Khel's user avatar
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157 views

I have a precision application where I am demodulating two sine waves using an analog mux (ADG613) and then Low pass filter to measure it's amplitude. The ADG613 is a 1:4 MUX made into a DPDT (chosen ...
Josh Girgis's user avatar
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so our TA asked us to simulate this modulator in lTspice but told us to add a capacitor that has a value of 0.1 uF at the output and record the result and confirm the envelope shape from message ...
lolls222's user avatar
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329 views

I have a precision application where I am trying to limit the charge injection on an analog mux that is demodulating a sine wave from 0deg and 180deg components (with a trigger signal from a ...
Josh Girgis's user avatar
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2 answers
82 views

Why is in some cases that the messaged received from the demodulation process has slightly more amplitude then the original message?
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I have read this equation from Savant's book that is used to calculate the capacitor for a demodulator: I've tried to calculate my circuit with this equation, but it didn't work. Then I tried to ...
Aethox's user avatar
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0 answers
214 views

First of all, I'm sorry if my English isn't perfect, that's not my natural language. I'm trying to simulate an electronic system for my project and I want to demodulate a sinusoidal signal. To do that,...
Benjamin M's user avatar
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0 votes
1 answer
103 views

I have simple circuit with ada4891 op amp. I am using it to demodulate ASK modulated signal. But sometimes op amp is pulsing to ground for no reason. These pulses are short (about 1 us). I have ...
andz's user avatar
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0 answers
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I was studying AM signal demodulation using envelope detection with the circuit shown below. In the book it says the low pass filter part is called a post-detection filter and that this filter causes ...
korbey's user avatar
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1 vote
1 answer
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I would appreciate some help to understand a parameter for this device https://www.semtech.com/products/wireless-rf/fsk-transceivers/sx1231h. I'm far from an expert at RF matters and this question has ...
Smarties's user avatar
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0 votes
1 answer
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1st attempt I have a problem. I built the FM demodulator circuit, but i am not sure if this signal is demodulated. This was my first attempt which following an answer, resulted in a 2nd attempt ...
Chuckyy's user avatar
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0 votes
1 answer
180 views

I need some help understanding this discriminator circuit for FM demodulation. (L1, C1) is the primary LC tank which resonates with the carrier frequency, whose FM signal is applied at V12. As the FM ...
Adriaan Berger's user avatar
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2 votes
2 answers
1k views

I am attempting to design an envelope detector, however, I'm having problems with regards to diagonal clipping and negative peak clipping of a certain input. While trying to follow this video's ...
charizo's user avatar
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0 votes
1 answer
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I have to write a thesis about digital communications, and I don't want to write something stupid in it. I also wrote that "most of the digital modulations and signal processing nowadays are done ...
Bálint Csejtei's user avatar
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1 vote
0 answers
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I'm very new to electrical engineering. I'm trying to understand the basic approaches/options to detect symbols after demodulation of BPSK. I found some articles mentioning Maximum Likelihood ...
6cfc1's user avatar
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1 vote
1 answer
2k views

I have understood how the envelope detector works, but I am unable to find the formula for R and C appropriate values. The closest I have found is this link: Explain The Square Law Demodulation and ...
The Force Awakens's user avatar
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2 answers
466 views

I have read that frequency modulation has the advantage that it can be demodulated non-coherently while phase modulation can only be demodulated coherently. I don't find any reason to support this ...
SUNITA GUPTA's user avatar
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2 votes
1 answer
290 views

This is what I mean by simple slope detector: Why can't it be like:
SUNITA GUPTA's user avatar
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0 votes
1 answer
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I want to communicate simple requests and ids over ultrasound. To do this I need to modulate a message onto a 40kHz carrier to drive a ultrasound transducer. Here you can find a simulation of what I ...
le_lemon's user avatar
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1 vote
1 answer
419 views

I have a circuit to demodulate 2KHz Infrared pulsed light which is generated by 555 timer IC and its output drives an IR transmitter circuit, which is received by IR receiver located 10 cm apart which ...
Nitin Kumar's user avatar
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