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.
Hi,
Want to design a fully differential opamp used in active rc leap-frog filter composition. Filter amps has 14pF and 15K resistor in the feedback.
Gain requirement is 45dB min and GB should be 120MHz. 65nm 1.2V supply.
Tried standard 2 stage fully diff topology with miller comp. That consumes...
@upvl,
Using "stb" is fine for Single ended structure. What if I have a fully differential opamp.
How would you suggest I should model the load seen by the opamp.
Thanks
Meghraj
Hello hafez,
I am designing the polyphase filter and am stuck at the exactly same problem as yours.
Cadence recommends following way to do the noise simulation in Complex filters: -
Problem
You are trying to do a Spectre noise simulation of a circuit with multiple inputs and/or outputs...
@ laoud and LvW
Filter is giving out I and Q signals. Since I am doing AC simulation, I and Q itself (each)are complex. Now we are interested in frequency response of I+jQ as a whole from -ve freq to + freq. This will in general create assymmetric frequency response across 0 freq.
How do we do...
For simulation part we can consider to apply 2 ac sources with 90 phase shift. But how would I plot the output with image frequency. How will I see how much Image rejection I am getting.?
Thanks Dick and PaloAlto,
I am going to try putting RC at the output as the bg is going to drive LDO's input cap. This seems like a brute force method (basically killing the BW) though.
BTW @PaloAlto :- Improving BW of the amplifier will shift the peaking frequency but it wont reduce the peak...
banba bandgap
Hello,
Designing a sub volt (Banba Type) bandgap.
I am having problem that my low frequency PSRR is say -40dB and then the PSRR rises to -29dB at say 10MHz and then again starts reducing.
Need to improve this peaking in PSRR curve.
Please help on this.
My understanding is:
1) DC...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
