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

help me for design class E power amplifier

Status
Not open for further replies.
R

rezaee

Full Member level 2
Joined
Jul 3, 2009
Messages
129
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,298
Activity points
2,117
help me for design

hi
i have designed a class-E power amplifier and i simulate it in ADS, i used lumped elements instead of capasitors and inductors and i use cmos transistor from TSMC0.18um designkit and i see good result but when i replace inductors and capacitors with TSMC0.18um spiral inductors and mim-capacitors my result is very bad now i dont know what i do? please help me with ur suggestions what is wrong?

Regards
 

help me for design

I would guess that the various parasitics are de-Q-ing the
tuned circuitry, possibly also taxing the drive of it. Be aware
of polarities, driving the bottom plate and taking your "input"
off the top,
using whatever decent isolation structures you might have
available underneath the inductors & caps, that kind of thing.

If you needed inductor Q better than 10 or so, you might be
in the wrong process. I think it's abnormal to see Q>20
except on some SOI (or semi-insulating substrates).

You might find it instructive to put up ideal vs PDK L, C elements
in some testbenches and look at the delivered vs ideal
frequency & transient response, driven ideally & practically.
Maybe there is something to see.
 

    R

    rezaee

    Points: 2
    Helpful Answer Positive Rating
Re: help me for design

thanks
yes you tell truth ,the Q of spiral inductor in TSMC0.18um is smaller than 20 but i see in ieee papers that they used sub-micron processes same TSMC or UMC or others and they reach good result ( for example they reach near 60% PAE)
but what is the reasons that when i substitute one element for example inductor in my tank-circuit with TSMC0.18um spiral inductor vs ideal ADS inductor (from lumped elements library ) my result be very bad . what can i do?

Regards
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top