I/Q Mixing

Started by rickman in comp.dsp3 months ago 11 replies

Why is I/Q mixing done in receivers prior to the ADC rather than using a single mixer and converting to complex from a real data stream. Is...

Why is I/Q mixing done in receivers prior to the ADC rather than using a single mixer and converting to complex from a real data stream. Is there some aspect of the signal that is lost if the signal is not down converted with an I/Q local oscillator? -- Rick C


Applications for low-latency closed-loop control

Started by Steve M in comp.dsp3 months ago 6 replies

Folks, This is a question about applications of technology rather than how to design it. An existing application includes an ADC/floating-point...

Folks, This is a question about applications of technology rather than how to design it. An existing application includes an ADC/floating-point processor/DAC controller to provide a closed-loop solution for emulating physical circuit characteristics up to say 100KHz. The closed-loop controller was required to have an effectively negligible delay (say 200ns) up to at least that frequen


Learning Complicated Integrals from a Simple Integral in mathHandbook.com

Started by Anonymous in comp.dsp3 months ago 3 replies

Learning Complicated Integrals from a Simple Integral just define one integral of f(x) is f(x) - x, it will know not only the...

Learning Complicated Integrals from a Simple Integral just define one integral of f(x) is f(x) - x, it will know not only the integral of f(x), but also f(x+1), 2*f(2*x+2), etc. IN: integrate(f(x_), x_) := f(x) - x; integrate(2*f(x+1)) OUT: 2*f(x+1) - 2*(x+1) reference math handbook www.mathHandbook.com


Fractional Calculus

Started by Anonymous in comp.dsp4 months ago 15 replies

Why do we need it? http://mathhandbook.com/

Why do we need it? http://mathhandbook.com/


Estimating transfer function with real poles, complex zeros

Started by Peter Mairhofer in comp.dsp4 months ago 9 replies

Hello, I find it pretty hard to estimate the poles and zeros of the following transfer function: https://snag.gy/LOJA3Q.jpg The raw CSV...

Hello, I find it pretty hard to estimate the poles and zeros of the following transfer function: https://snag.gy/LOJA3Q.jpg The raw CSV data is available here https://pastebin.com/ZBshB6eC (first/third column: frequency in Hz, second column: magnitude in dB, fourth col: angle in deg). It comes from a circuit simulator (ac analysis) and I want to use it with a high level simulation ...


[OT] I got a JOB!!!

Started by Tim Wescott in comp.dsp4 months ago 46 replies

Since this is a newsgroup, and this is news... Wescott Design Services is going into remission, while I pursue a day job. Job title is...

Since this is a newsgroup, and this is news... Wescott Design Services is going into remission, while I pursue a day job. Job title is Software Designer 5 at Planar Systems -- so any circuit design or control systems jones will have to be satisfied by hobby work or on the side. In the near term I'll be finishing up current work with current customers; in the longer term I'll probabl...


Stability in PID Controllers

Started by Randy Yates in comp.dsp4 months ago 18 replies

I know next-to-nothing about this topic, but the following question has popped into my mind several times. It seems like folks generally (and...

I know next-to-nothing about this topic, but the following question has popped into my mind several times. It seems like folks generally (and perhaps this is totally wrong) design PID controllers by basically selecting what they think are "good" constants for the proportional, integral, and derivative terms. That is, they just sorta play with their systems and tweak the terms until it seem...


Geometric Algebra

Started by Anonymous in comp.dsp4 months ago 2 replies

I think this set of 6 introductory videos on geometric algebra is neat. https://youtu.be/srwoPQfWWS8?list=PLLvlxwbzkr7igd6bL7959WWE7XInCCevt

I think this set of 6 introductory videos on geometric algebra is neat. https://youtu.be/srwoPQfWWS8?list=PLLvlxwbzkr7igd6bL7959WWE7XInCCevt


Recreating Undersampled Data

Started by Rob Gaddi in comp.dsp4 months ago 31 replies

I've got a situation coming up that I'm trying to think through in advance. I'm running an ADC at let's say 1 Msps, sampling an input waveform...

I've got a situation coming up that I'm trying to think through in advance. I'm running an ADC at let's say 1 Msps, sampling an input waveform that is known to be a triangle wave at roughly 2 1/16 MHz. So with every ADC sample I advance across the input waveform by about 22.5 degrees, having missed a bit along the way. And I acquire that data and now I'm looking at it offline, and I'd...


How to downsample this signal?

Started by Piotr Wyderski in comp.dsp4 months ago 30 replies

Hello, I have the 50Hz mains voltage signal sampled at 12bit/100kHz. This high frequency is for rapid detection of overvoltage conditions....

Hello, I have the 50Hz mains voltage signal sampled at 12bit/100kHz. This high frequency is for rapid detection of overvoltage conditions. However, for further processing this sample rate is way too high, so I'd like to change the sampling rate by a factor ~100 (not a very critical value, just "sensibly low"). The thing will be implemented on a PSOC5LP, which has a dedicated digital fi...


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