Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1984-02-10
1985-09-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330254, 330 86, H03G 320
Patent
active
045423490
ABSTRACT:
A digital control amplifier is provided as a unitary monolithic device to control the transfer function of an analog signal in response to a digital control, such as from a digital computer. A current transfer cell is employed which uses an amplifier circuit having transistors of like polarity, and is capable of both attenuation and greater than unity amplification of an input analog signal. A digital-two-analog converter is integrated into the system and employs a series of current dividers which enables a common reference current to be used for each bit of the converter. A current reference circuit for the converter employs a band gap voltage regulator with a temperature compensation design that varies the control signal applied to the current transfer cell to compensate for temperature-induced variations in the output of the cell.
REFERENCES:
patent: 4027281 (1977-05-01), Greve et al.
patent: 4234804 (1980-11-01), Bergstrom
Mullins James B.
Precision Monolithics, Inc.
Wan G.
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