Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1977-01-24
1978-05-16
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
328145, 330293, 330294, 330310, H03F 304
Patent
active
040901505
ABSTRACT:
An amplifier circuit for the unadulterated transmission of phase information of a supplied ac voltage signal over a large dynamic range includes a series connection of a series of similar amplifier stages each of which is followed by a symmetrical limiter. The amplifier operates as a logarithmic amplifier for maintaining the amplitude information of the supplied ac signal. Each of the amplifier stages comprise an emitter-base transistor amplifier circuit having negative feedback and an output circuit which contains a resonant circuit which is strongly damped by an attenuating resistor and whose capacitance is formed by a trimmer capacitor connected in parallel to a pair of diodes. The diodes are connected in anti-parallel relation to one another and represent the limiter. The capacitance is adjustable for purpose of impedance adjustment and is set in such a manner that the resultant resonant circuit impedance is capacitive.
REFERENCES:
patent: 3319176 (1967-05-01), Guisinger
patent: 3403347 (1968-09-01), Stull, Jr.
patent: 3605027 (1971-09-01), Nichols
patent: 3717820 (1973-02-01), Garcia et al.
Dahl Lawrence J.
Siemens Aktiengesellschaft
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