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Design >> Analog Design >> On analog filter and PGA
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Message started by ywguo on Aug 2^nd, 2006, 10:39pm

Title: On analog filter and PGA
Post by ywguo on Aug 2^nd, 2006, 10:39pm

Hi, Guys,

I need design a contuous-time filter and a PGA. Would you please tell me some good literatures and tutorials?

Thanks
Yawei

Title: Re: On analog filter and PGA
Post by ACWWong on Aug 3^rd, 2006, 6:24am

there are some tutorials circuitsage.

http://circuitsage.com/filter.html

There are loads of papers detailling continuous time filters and PGA for all types of systems (wireless & wired) at the IEEE.

Title: Re: On analog filter and PGA
Post by loose-electron on Aug 3^rd, 2006, 3:01pm

A little more information please - what frequencies are we talking about here?

Underneath 5 MHz we are probably talking about structures using op-amps.
From 5 MHz to around 300 MHz wer are talking about gm-C filters and wideband amplifiers.
Above 300 MHz, is more wideband amplifiers and LC networks.

All of that is continuous time, if sampled time, you can add switched cap filters and some DSP methods - ADC - FIR - DAC type of structures as well.

The frequencies are not hard and fast, but depend on the silicon that you are on. A few years back, op-amps were not going to fly above 1 MHz, and now they get used at higher frequencies.

Circut Sage has some stuff, and also get a copy of the IEEE - JSSC DVD with all of the JSSC on it. There are a lot of things in there. Likewise, a bunch of textbooks include different sections on filter architectures. Google it.