Do all substrate of NMOS connect to ground and PMOS to VDD?

[adwxl]

A simple question

I want to design a opamp. Did all substrate of NMOS connect to ground and PMOS connect to VDD?

 

[safwatonline]

Re: A simple question

I want to design a opamp. Did all substrate of NMOS connect to ground and PMOS connect to VDD?

yes

 

[waveronics]

Re: A simple question

some technologies support to make every transistor in a stand alone well if so u can connect the the bulk to the source

 

[fendy]

Re: A simple question

Normally,the the bulk of NMOS is connected to GND.
Of course,I know some process can support the bulk of NMOS connect to it's source(not GND).

Added after 24 minutes:

The transistors must be operation at satuation region,so:
1.M1 operation in satuation region:
Vin,CM<Vdd-Vdsat1-Vsg2
2.M2 operation in satuation region:
Vp-Vin,CM-|Vth2|<Vp-Vth4
--->Vin,CM>Vth4-Vth2
To improve ICMR,connect the M2&M3 bulk to VDD.
To improve PSRR and noise,connect the M2&3 bulk to source.

 

[piao]

A simple question

It depends on the process you are using. if it provides the double well process, you can connnect the bulks of PMOS and NMOS to its source ( well).

However, usually they just provide the NWELL process, that means you can connect the bulk of the NMOS to ground while the bulk of PMOS to its source or VDD. vice versa.

 

[laglead]

Re: A simple question

It depends the process: N-well on P substrate of P well on N substrate.