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In Reply to: Re: Try this one instead ... posted by Spartacus on March 25, 2002 at 11:06:45:
... would the value of the current mirror's loading resistor that determine Vout affect linearity at all? I'm wondering, as the concept of going to a lot of trouble to get our 2V rms out of a DAC, only to throw much of it away at the attenuator seems wasteful - maybe the loading resistor could be made variable.
Follow Ups:
in this case it wouldn't work because it is also used to set the DC bias of the output stage. I don't quite follow what is gained by changing the voltage at this point instead of later in the chain since the you will get better signal to noise ratio the farther downstream it is attenuated and you still would need the capability of full voltage output from the DAC so it's not really wasteful. I have my attenuator incorporated into the amplifier input circuit so it's pretty transparent anyway.Dave
Well, with a traditional setup you get added noise from the resistive attenuator, plus it usually needs a drive afterwards. It seems philosophically pleasing to me to get exactly the voltage you need from the I/V stage, then feed it staight to the power amp. Not practical of course. Philosophy may not translate very well into practice, either.
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