configurable analogue blocks

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Anonymous
Not applicable

 a simple question, I understand the concept of PLDs (programmable logic devices) but how can an analogue block be configured?? I am not asking about how to do it in PSOC creator but rather on the technology that creates the block.

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ETRO_SSN583
Level 9
Level 9
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I will give this a try.

   

 

   

Analog is generally speaking founded on sw cap technologies or on continuous time

   

amplifier surrounded by gain and offset setting elements. So for example a PGA type

   

element consists of a gain block amd muxes controlling feedback R's. The gain

   

block may have its bias set via a muxed R, which in term controls GBW, slew rate,

   

etc.. Offsets, by this I mean common mode offsetting, done by another ladder terminated

   

in a reference of some kind. Ratios of R's or absolute values are meaningful depending

   

on architecture.

   

 

   

In the case of sw cap technologies, you are adding capacitors and clocking as a means of control.

   

Classic case is simple switch feeding a cap, and Z becomes a f(F,C), see -

   

 

       

http://en.wikipedia.org/wiki/Switched_capacitor

   

http://technologyinterface.nmsu.edu/3_3/3_3g.html

   

http://www.eecg.toronto.edu/~johns/ece512/lecture_notes/10_switched_capacitor_2_per_page.pdf

   

 

   

so we add clock rate to the control toolbox. And substitute C for R in some cases.

   

 

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 thanks Dana

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