Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

wide range high speed common mode level shifter

Status
Not open for further replies.
S

sainiparvesh

Newbie level 6
Joined
Jul 1, 2009
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
noida
Activity points
1,371
Hello All,
Can anybody suggest some closed loop architecture to level the 500MHz from 0.5-0.65V input common mode to 0.4V-1.3V output common mode. I tried (super)source follower based with dual SSF, first being pmos input and second being nmos input at 2.5V but I couldn't meet the linearity spec(>18dBm OIP3 with -7dBm input power). So now I am looking for some op-amp based level shifter for above spec.. It would great if anybody can suggest some reference or circuit etc.
Regards,
Pravesh
 

Can anybody suggest some closed loop architecture to level the 500MHz from 0.5-0.65V input common mode to 0.4V-1.3V output common mode.
Click to expand...
Rather unclear. Are you talking about an amplifier? If so, which gain? Otherwise the input CM falls already in the output CM range, so no level shift required.
 

FvM said:
Rather unclear. Are you talking about an amplifier? If so, which gain? Otherwise the input CM falls already in the output CM range, so no level shift required.
Click to expand...


Sorry for confusion. 1. Its an unity gain level shifter/buffer, Actually ADC(undecided) to be driven by this level shifter can be 1.1V or 2.5V, so actual range of interest for output CM is ~0.4-0.6V(1.1V ADC) and ~1.1-1.3V(for 2.5V ADC). Thatswhy I wanna design a LS to fulfill above range irrespective of ADC to be selected.
 

True differential amplifiers are the usual means to drive ADC with defined common mode voltage and increase common mode rejection at the same time.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top