Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-01-29
1989-08-29
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330289, H03F 345, H03F 304
Patent
active
048621021
ABSTRACT:
A method and apparatus for minimizing the self heating distortion of a compensated differential transconductance amplifier having an error voltage generator is provided. In a preferred embodiment, the bases of a first pair of transistors are coupled together and to an adjustment voltage source. The bases of a second pair of transistors are coupled together and to a reference voltage source. The collectors of the transistor pairs are coupled together to form a differential current output. The output currents of the compensated amplifier are segregated into two currents, one originating in the error voltage generator, a second current being the remainder. The first current is directed to flow through the first pair of transistors, the second current is directed to flow through the second pair of transistors. By varying the adjustment voltage, the power of the error voltage generator is independently varied, which in turn adjusts the thermal characteristics of the amplifier, in order that a minimum amount of thermal distortion may be obtained.
REFERENCES:
patent: 3727146 (1973-04-01), Hughes
Tektronix Inc.
Wan Gene
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