Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-05-27
2000-09-05
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330290, H03F 345
Patent
active
061149098
ABSTRACT:
A differential amplifier (24) includes a pair of transistors (Q2 and Q9); a differential amplifier 25 includes a pair of transistors (Q3 and Q6). A difference in output currents at the differential amplifier (24) is detected by differential amplifier (25). Then, transistors (Q3 and Q6) in differential amplifier (25) supply currents flowing therein into transistors (Q4 and Q5), whose bases are connected to each other via a capacitor (26). With this arrangement, a difference in DC components between a pair of differential currents flowing in the differential amplifier (25) is obtained at both terminals of the capacitor (26). The obtained voltages at the both terminals of the capacitor (26) are fed back to the input of the differential amplifier (24) via transistors (Q1 and Q8), so that offsets at inputs of the differential amplifier (24) are corrected.
REFERENCES:
patent: 5392002 (1995-02-01), Delano
patent: 5399988 (1995-03-01), Knierim
patent: 5525930 (1996-06-01), Pothast et al.
patent: 5757232 (1998-05-01), Hosoya
patent: 5838197 (1998-11-01), Tsukuda
patent: 5867062 (1999-02-01), Kudou
Anzai Fukuji
Inoue Hidekazu
Nguyen Khanh Van
Pascal Robert
Sanyo Electric Co,. Ltd.
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