Variable gain circuit with improved gain response

Details Variable gain circuit with improved gain response Variable gain circuit with improved gain response

1999-03-05

2000-10-03

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330134, H03F 345

Patent

active

061278904

ABSTRACT:
A variable gain circuit amplifies an input signal with a gain which depends on a control voltage. The gain circuit has a first amplifier with a gain that is proportional to the control voltage in a relatively low region of the control voltage and a second amplifier with a gain that is proportional to the control voltage in a relatively high region of the control voltage. The second amplifier also includes a gain circuit which maintains the gain of the second amplifier constant in a relatively low range of the control voltage. The second amplifier is connected to the first amplifier via a pair of coupling capacitors. The variable gain circuit may be used in a transmitter of a CDMA telephone.

REFERENCES:
patent: 4396891 (1983-08-01), Johansson et al.
patent: 4489282 (1984-12-01), Jett, Jr.
patent: 4816772 (1989-03-01), Klotz
patent: 5732342 (1998-03-01), Roth et al.
patent: 5940143 (1999-08-01), Igarashi et al.

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