Amplifiers – With semiconductor amplifying device – Including temperature compensation means
Patent
1994-10-21
1996-01-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including temperature compensation means
H03F 130
Patent
active
054831997
ABSTRACT:
A method and apparatus for maintaining stability while substantially compensating an output signal of a high gain, wide band amplifier having an undesirable signal dependent offset voltage, generated by signal dependent self heating of circuit components. A thermal offset voltage generator producing a signal dependent thermally generated offset voltage similar to that of the wide band amplifier is provided. The input of the thermal offset voltage generator is coupled an output of the wide band amplifier. The output of the thermal offset voltage generator is amplified and low pass filtered to provide a filtered compensating signal. The filtered compensating signal is injected into the wide band amplifier so as to substantially compensate an output signal of the wide band amplifier for the signal dependent thermally generated offset voltage of the wide band amplifier.
REFERENCES:
patent: 3418592 (1968-12-01), Solomon et al.
patent: 3753139 (1973-08-01), Spencer
patent: 4442410 (1984-04-01), Daniel
patent: 5200654 (1993-04-01), Archer
patent: 5331291 (1994-07-01), D'Agostino et al.
Hewlett--Packard Company
Mullins James B.
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