Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

1998-06-04

2000-08-08

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327359, H03F 345

Patent

active

061007609

ABSTRACT:
Current controllers (C1 and C2) are connected to a power source (Vcc) in common through a load (L). Inputs of the current controllers (C1 and C2) are connected to outputs of current amplifier parts (A1 and A2) respectively, and the current amplifier parts (A1 and A2) are connected to a ground level (GND) through constant current sources (CS1 and CS2) respectively. The current amplifier part (A1) has a high gain, and the current amplifier part (A2) has a low gain. Thus, a variable gain amplifier whose input range does not abruptly change with respect to a control voltage is obtained, and a variable gain amplifier widening its input range is provided.

REFERENCES:
patent: 4019118 (1977-04-01), Harwood
patent: 4128817 (1978-12-01), Gomi
patent: 5621358 (1997-04-01), Pisati et al.
patent: 5734295 (1998-03-01), Kagawa
patent: 5821810 (1998-10-01), Swart et al.

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