Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-04-30
1999-04-20
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327359, H03F 345
Patent
active
058960635
ABSTRACT:
A variable gain amplifier having improved bandwidth and linearity, and having improved dynamic range by allowing the amplifier to be designed for low noise performance, while retaining the linearity normally lost with low noise designs. The amplifier is of the current steering type, having a differential current steering input stage coupled to a further current steering stage for controlling the gain responsive to a gain control signal. Current is maintained in a pair of common base connected transistors in the output circuit so that these transistors do not create excessive noise or limit the bandwidth and linearity of the amplifier at low gain. Maintaining the current in these transistors responsive to the gain control signal may maintain a substantially constant current in these transistors independent of gain. Exemplary embodiments are disclosed.
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PCT Application No. PCT/US98/07334 International Search Report dated Jul. 9, 1998.
"Bipolar And MOS Analog Integrated Circuit Design", Alan B. Grebene, John Wiley & Sons, Inc., 1984, pp. 445-446.
Marsh James W. H.
Williams Scott Lindsey
Maxim Integrated Products Inc.
Mottola Steven J.
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