Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1980-11-03
1983-02-15
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
179 1A, 330255, 330264, 330311, H03F 326
Patent
active
043743633
ABSTRACT:
A balanced preamplifier is disclosed for impedance-coupling an audio signal source, such as a microphone, to a differential amplifier. In one embodiment, the preamplifier comprises a first stage wherein a pair of complementary bipolar transistors are connected in a common-base configuration and coupled to a low-impedance microphone so that the microphone signal is appied to the respective emitters of the transistors and transformed to an appropriately higher impedance level at the respective collectors thereof with common-mode passage of external and internal noise. A second stage including a complementary pair of bipolar transistors in a common-emitter configuration is coupled to the first stage for greater power and voltage amplification requirements. In a second embodiment, the preamplifier comprises a pair of complementary field-effect transistors (FET) connected in a series common-drain configuration and coupled to a high-impedance microphone so that the microphone signal is applied to the respective gates of the FETs and transformed to an appropriately lower impedance level at the respective sources thereof with common-mode passage of noise.
REFERENCES:
patent: 3305733 (1967-02-01), Jahn
patent: 4096443 (1978-06-01), Gilson
patent: 4321553 (1982-03-01), Wagner
Hansen Henry
Mullins James B.
Sciascia R. S.
Vozzo, Jr. Armand M.
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