Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-10-31
1992-10-20
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
051573504
ABSTRACT:
Class A gain control systems having extremely good linearity and wide dynamic range, and suitable for monolithic integration, are described in embodiments realizing several classical multiplier functions such as voltage controlled attenuators, exponentially controlled multipliers and four quadrant multipliers. Two identical current steering circuits, each comprising a matched, emitter coupled pair of transistors, or effective transistors, are fed from an actively linearized input circuit which derives the required well balanced signals from a single ended or balanced input source, and current mirror circuits are used to subtract unwanted common mode products from the output signals.
REFERENCES:
patent: 4360786 (1982-11-01), Rehfeldt
patent: 4701719 (1987-10-01), Nagata
patent: 5089789 (1992-02-01), Tran
Dinh Tan
LaRoche Eugene R.
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