Resistance in CMOS Process

[Alles Gute]

In a CMOS process, normally we have many different implementation for a resistor. Like Npoly, Ppoly, Nwell, Nactive,Pative etc.
What's the difference betweeen these implementations and how to choose?

 

[lavitaebelle]

main differences are with respect to sheet resistance, temperature coefficient and susceptibility to mismatch.

For ex: Nwell has much higher sheet resistance than poly but has worse tempco.

So it depends on what application we are using the resistor.

 

[Alles Gute]

If for mismatch, which is better? Can u recommand some literature?

 

[Hughes]

For mismatch, poly resistor is better.