AM intermediate frequency variable gain amplifier circuit,...

Details AM intermediate frequency variable gain amplifier circuit,... AM intermediate frequency variable gain amplifier circuit,...

2004-11-11

2008-10-28

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000, C330S253000

Reexamination Certificate

active

07443240

ABSTRACT:
It is an object of the present invention to provide a variable gain amplifier circuit operable with a low power supply voltage and with less noise generated inside the circuit. In the variable gain amplifier circuit, a third MOS transistor is connected between the respective sources of two MOS transistors constituting a differential amplifier circuit and to the gate of the third MOS transistor, and a DC bias voltage for operating the third MOS transistor in a non-saturated region is supplied. If the output voltage of an AM intermediate frequency variable gain amplifier circuit increases, a control voltage for reducing the resistance between the source and drain of the third MOS transistor is applied to reduce the gain of the AM intermediate frequency variable gain amplifier circuit.

REFERENCES:
patent: 3641450 (1972-02-01), Lunn
patent: 5642077 (1997-06-01), Nagaraj
patent: 6744320 (2004-06-01), Nguyen et al.
patent: 7215196 (2007-05-01), Banba et al.
patent: 2006/0044064 (2006-03-01), Pelleriti
patent: 2007/0236289 (2007-10-01), Iriguchi
patent: A-01-212009 (1989-08-01), None
patent: A-02-081505 (1990-03-01), None
patent: A-05-029856 (1993-02-01), None
patent: A-05-335848 (1993-12-01), None
patent: A-07-122950 (1995-05-01), None
patent: WO 01/63754 (2001-08-01), None
Korean Office Action dated Jan. 30, 2007 for application No. 2006-7008428 with English translation.

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