LNA having a post-distortion mode and a high-gain mode

Details LNA having a post-distortion mode and a high-gain mode LNA having a post-distortion mode and a high-gain mode

2008-02-06

2010-06-29

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

07746169

ABSTRACT:
A differential low noise amplifier (LNA) is operable in a selectable one of two modes. The LNA includes a first transistor, a second transistor, a third transistor and a fourth transistor. In the first mode (PDC mode), the four transistors are configured to operate as a post-distortion cancellation (PDC) LNA. The third and fourth transistors operate as cancel transistors that improve linearity, but reduce LNA gain somewhat. In the second mode (high gain mode), the third and fourth transistors are configured so that amplified versions of the LNA input signal that they output are added to amplified versions of the LNA input signal that are output by the first and second main transistors, resulting in increased gain. Multiplexing circuits are provided within the LNA so that the LNA is configurable into a selectable one of the two modes by controlling a digital mode control signal supplied to the LNA.

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Che-Sheng Chen et al: “A 2.5GHz 90NM CMOS Triple Gain Mode LNA for WIMAX Applications” Signals Systems and Electronics, 2007. Issue '07. International Symposium on, IEEE, PI, (Jul. 1, 2007), pp. 367-269, XP031129290.
Guochi Huang et al: “Post Linearization of CMOS LNA Using Double Cascode Fets” Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on, IEEE, Piscataway, NJ, USA, (May 21, 2006), pp. 4499-4502, XP010939693.
International Search Report—PCT/US09/033474, International Search Authority—European Patent Office—Apr. 15, 2009.
Written Opinion—PCT/US09/033474, International Search Authority—European Patent Office Apr. 15, 2009.

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