Low noise and low input capacitance differential MDS LNA

Details Low noise and low input capacitance differential MDS LNA Low noise and low input capacitance differential MDS LNA

2011-05-17

2011-05-17

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S283000

Reexamination Certificate

active

07944298

ABSTRACT:
A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmetrical and cross-coupled fashion. The main transistors are source degenerated. Because the gates of cancel transistors are not coupled to the differential input leads of the LNA, the input capacitance of the LNA is reduced. Noise introduced into the LNA output due to the cancel transistors being biased in the sub-threshold region is reduced because there are two stages. The first stage involves the main transistors, and the second stage involves the cancel transistors. By increasing the gain of the first stage and decreasing the gain of the second stage, overall LNA gain is maintained while reducing the noise that the sub-threshold biased transistors contribute to the LNA output.

REFERENCES:
patent: 7432763 (2008-10-01), Leete
patent: 7746169 (2010-06-01), Deng et al.
patent: 2005/0176399 (2005-08-01), Aparin
patent: 2007/0229154 (2007-10-01), Kim et al.
International Search Report—PCT/US2008/086950—International Search Authority EPO—Mar. 30, 2009.
Aparin, V., et al.: “Modified derivative superposition method for linearizing FET low-noise amplifiers,” IEEE Transaction on Microwave Theory and Techniques, IEEE Service Center, Piscataway, NJ, US, vol. 53, No. 2, Feb. 1, 2005, pp. 571-581
Cho, K-R., et al.,“A novel CMOS operational transconductance amplifier based on a mobility compensation technique,” IEEE Transactions on Circuits and Systems II: Express Briefs, IEEE Service Center, New York, NY, US, vol. 52, No. 1, Jan. 1, 2005, pp. 37-42, ISSN: 1057-7130.
Kim, T-S., et al.: “Linearization of differential CMOS low noise amplifier using cross-coupled post distortion canceller,” Radio Frequency Integrated Circuits Symposium, 2008. RFIC 2008, IEEE, Piscataway, NJ, US, Jun. 17, 2008, pp. 83-86, ISBN: 978-1-4244-1808-4.
Written Opinion—PCT/US2008/086950—International Search Authority—European Patent Office—Mar. 30, 2009.

Affiliated with

Also associated with

Rating

Low noise and low input capacitance differential MDS LNA does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low noise and low input capacitance differential MDS LNA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise and low input capacitance differential MDS LNA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2633879