Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1983-06-21
1985-07-23
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330257, H03F 345
Patent
active
045310971
ABSTRACT:
A high frequency amplifier comprising a pair of input transistors forming a differential amplifier stage, with an impedance connected between the common terminals of the input transistors to vary the amplification factor of the amplifier stage. The variable impedance is formed by a diode bridge the a.c. terminals of which are connected to the common terminals of the input transistors and the d.c. terminals of which are connected to a circuit arrangement including current mirrors to feed a d.c. current to the diode bridge to control its impedance and hence the amplification factor of the differential amplifier stage.
REFERENCES:
patent: 3032704 (1962-05-01), Beck
patent: 3962650 (1976-05-01), Gay
patent: 4134078 (1979-01-01), Takao et al.
Gotz Laszlo
Kowatsch Hermann
Honeycutt Gary C.
Merrett N. Rhys
Mullins James B.
Sharp Mel
Texas Instruments Deutschland GmbH
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