Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-08-03
2000-02-01
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327359, H03F 345
Patent
active
060207868
ABSTRACT:
A variable gain amplifier (VGA) may be useful in applications where the input amplitude is constant but the output must vary over a wide range. Some VGAs have a desirable exponential control characteristic, but an undesirable temperature characteristic that causes the gain to change with temperature when the control voltage is held constant with respect to temperature. The present invention is directed to a circuit that will convert a control signal (e.g., a voltage) that is constant with temperature into a voltage that can be applied to a VGA in such a way that the temperature variation of the VGA is eliminated without changing the desirable exponential control characteristics.
REFERENCES:
patent: 5030924 (1991-07-01), Fritz
patent: 5471173 (1995-11-01), Moore et al.
"Bipolar and MOS Analog Integrated Circuit Design", by Alan B. Grebene, 1984 A Wiley-Interscience Publication by John Wiley & Sons, Inc., 4 pgs.
"Analogue IC Design: The Current-Mode Approach", edited by C. Toumazou, F.J. Lidgey, and D.G. Haigh, 1990 Peter Peregrinus Ltd., IEE, London, UK, pp. 74-77.
"Analysis and Design and Analog Integrated Circuits", by P. Gray and R. Meyer, 1993, pp. 338-347.
Lucent Technologies - Inc.
Mottola Steven J.
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