switched opamp comparator

[nodame123]

In the circuit of a switched op amp,there are many bias voltages(i guess) to be given. I don't have any idea abt how much to be given.LTspice simulation of the comparator just shows a plain 0 for the dc sweep of input voltage.
Could anyone help me with this..please,it's sort of urgent..

circuit is in pg-76
thank you..

 

[BradtheRad]

Generally the different bias inputs are there for you to adjust until a 'good operating point' is found.

The purpose is so that your circuit will accept a range of input signals which you feed it, and produce a usable output.

Some of the mosfets are like a variable resistor.

One bias might need to be adjusted depending on the supply V.

Another to adjust current through a long-tail pair.

Others might need adjusting depending on how much DC is riding your input signals.

Another to alter gain.

Another to provide a desired positive current range to the output load. Or a negative current range.

Another so you can obtain zero output with zero input. Or else perhaps perform a volt level shift.

Etc.

 

[nodame123]

Ohh.. thank u very much..