Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1976-05-27
1978-03-28
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330 69, H03F 345
Patent
active
040817580
ABSTRACT:
A signal amplifier arrangement comprises first and second differential amplifiers coupled in common to a current source which supplies all of the current to the amplifier circuits. Signals to be amplified are coupled between the control electrodes (bases) of the devices in each of the differential circuits by means of voltage follower stages. The main conduction path (collector-emitter) of each of the followers is coupled in series with the main conduction path of the device in the first differential circuit other than the one to the control electrode of which the follower output is coupled. Output signal current is produced in one or more load circuits connected to the second differential circuit, the output signal current being related to the differential input signal voltage but substantially independent of current level induced base-emitter voltage variations in the differential amplifier devices.
REFERENCES:
patent: 3641450 (1972-02-01), Lunn
patent: 3848139 (1974-11-01), Holt, Jr.
patent: 3916333 (1975-10-01), Zuk
Dahl Lawrence J.
Meagher William H.
RCA Corporation
Schaefer Kenneth R.
Whitacre Eugene M.
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