Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1996-08-23
1999-02-02
Chin, Wellington
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552401, 4552491, 455340, 330 9, H04B 116
Patent
active
058677771
ABSTRACT:
A variable-gain amplifier circuit has an offset correcting function by which the fluctuation of offset due to the switching of a gain is decreased. In an offset detection mode, an input offset voltage of the variable-gain amplifier circuit is inputted to an offset retaining section, and in a signal amplifying mode, the offset is corrected by subtracting the output of the offset retaining section from an input signal by means of an input section of the variable-gain amplifier circuit. In addition, the variable-gain amplifier circuit can be applied to a radio receiver. The offset produced in a baseband section of a receiver is corrected by the offset correcting function of the variable-gain amplifier circuit, so as to prevent the quality of communication from being deteriorated.
REFERENCES:
patent: 4404525 (1983-09-01), Amir et al.
patent: 4479253 (1984-10-01), Daniel, Jr.
patent: 4565971 (1986-01-01), Brookshire
patent: 5124663 (1992-06-01), McEntarfer et al.
patent: 5264804 (1993-11-01), Fox
patent: 5471654 (1995-11-01), Okazaki et al.
Itakura Tetsuro
Tsurumi Hiroshi
Yamaji Takafumi
Chin Wellington
Kabushiki Kaisha Toshiba
Sobutka Philip J.
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