who have level shift circuit?

[legend]

I want to shift DC voltage(0v~3v level shift to 0.5v~1.25v). who can help me? thanks in advance.

 

[Btrend]

1.if ur input is only 0 and 3V, u can simply use analog switches to switch 0.5V and 1.25V to the output.
2. if ur input is in range 0 to 3V, u should use ordinary level shifting ckt (can be found on text books talking about CMOS IC design) with top rail supply by 1.25V and bottom clamping at 0.5V

 

[dumbfrog]

two stage inverter
first stage connects to 3V supply
second stage connects to 1.25V supply

 

[richloo]

Use an ordinary inverter with PMOS source to 1.25V while NMOS source to GND. This will produce swing of 0~1.25V swing.
Now, in order to clamp to 0.5V, u need to stacked additional PMOS biased with 0V (assume that your Vtp is 0.5V), on top of the drain of the NMOS.

1.25
|
(P)
|
|---- out
|
(P) <---bias with GND
|
(N)
|
GND

 

[Willebul]

Hi

For pure digital level shifting look at the Texas instruments Sn74LVC1T45 and
Sn74LVC2T45 dual supply buffers.


Regards
W

 

[yeewong_su]

You should gen the 0.5 and 1.25 reference voltage. and using the simple level shift. OK