Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1996-02-29
1998-06-09
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330300, 330285, H03G 330, H03F 316
Patent
active
057641064
ABSTRACT:
A gain-controlled amplifier for an integrated circuit includes a PNP gate controlled lateral bipolar transistor (GCLBT) which is configured in a common base configuration. The emitter electrode of the GCLBT is connected to a Bias-T having an inductor and a capacitor. The collector electrode of the GCLBT is coupled to a load capacitor, the capacitance of which is selected to alter the bandwidth of the amplifier. A gain control voltage is applied to the gate electrode of the GCLBT to control the amplifier gain. An input signal to be amplified is coupled to the emitter electrode of the GCLBT. An output signal, which is amplified in response to the gain control voltage, is provided from the collector electrode of the GCLBT. The gain-controlled amplifier can be used for an automatic gain control amplifier and also may be used for radio frequency and intermediate frequency amplifiers.
REFERENCES:
patent: 4334196 (1982-06-01), Schade, Jr.
patent: 5331290 (1994-07-01), Harford et al.
patent: 5467057 (1995-11-01), Joardar
patent: 5498885 (1996-03-01), Deen et al.
Deen M. Jamal
Malhi Duljit S.
Yan Zhixin
de Wilton Angela C.
Mottola Steven
Northern Telecom Limited
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