Differential amplifier

Details Differential amplifier Differential amplifier

2011-03-01

2011-03-01

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

07898328

ABSTRACT:
In a wireless communications system, it is important to realize a limiter operation by which a differential amplifier for amplifying a local signal may stably supply an output signal having a constant amplitude. However, when a signal handled by the system has a high frequency, a gain of the differential amplifier is reduced and the limiter operation may not be performed appropriately. The differential amplifier is configured employing a double cascode connection to enhance an output impedance, an upper transistor of the double cascode connection realizes enhancement in gain and frequency characteristics based on a positive feedback signal, and a lower transistor of the double cascode connection controls an operating point and suppresses an allowable output voltage range by operating in a linear region and based on a negative feedback signal to facilitate the limiter operation.

REFERENCES:
patent: 5838200 (1998-11-01), Opris
patent: 5864257 (1999-01-01), Rothenberg
patent: 6469579 (2002-10-01), Bazes
patent: 6781451 (2004-08-01), Kwan et al.
patent: 6963246 (2005-11-01), Sugimura
Thomas H. Lee, “The Design of CMOS Radio-Frequency Integrated Circuit,” 2nd Edition, p. 387, 2004, Cambridge University Press.

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