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Design >> RF Design >> NQS effect in LNA design
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Message started by ssk_288 on Oct 17^th, 2005, 7:01am

Title: NQS effect in LNA design
Post by ssk_288 on Oct 17^th, 2005, 7:01am

Hi,

I am designing a LNA to operate at 2.4 GHz. I am using the classical LNA design. How do I account for the channel charging resistance due to Non-Quasi static effect. I have set NQSmod = 1 in the model file but I do not see any variation in S11 due to this. I am using 0.13um technology.

regards
SUDHIR

Title: Re: NQS effect in LNA design
Post by Paul on Oct 19^th, 2005, 12:26am

Hi Sudhir,

if you use minimum channel length devices in the technology you use, I would guess the QS assumption holds in the 2.4GHz region. What is your upper frequency limit when running S-parameter simulation?

Paul

Title: Re: NQS effect in LNA design
Post by ssk_288 on Oct 21^st, 2005, 10:41pm

Hi Paul

Thanx for replying

Actually I am designing a Zigbee compliant transceiver. The frequency range of operation is from 2.405 GHz to 2.480 GHz. I am not using minimum length devices because the output impedence is very less for minimum length devices.
Min length - 120nm
transistor length I am using 300nm

Regards
SUDHIR