Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1978-05-25
1979-09-25
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
H03F 345, H03G 310
Patent
active
041692470
ABSTRACT:
Two terminals of a variable resistor are respectively connected via resistors to bases of two transistors which constitute an input stage of a differential amplifier while the movable contact of the variable resistor is fed with a predetermined voltage. Either the resistance of the variable resistor with respect to the resistances of fixed resistors connected to the bases or the ratio between the fixed resistors is so selected that the variation of the maximum resistance of the variable resistor does not influence the relationship between the position of the movable contact and the gain of the differential amplifier.
REFERENCES:
patent: 2930982 (1960-03-01), Patterson
patent: 3210683 (1965-10-01), Pay
patent: 3310688 (1967-03-01), Ditkofsky
Ritter, "Controlling Op Amp Gain with One Potentiometer", Electronics, Jul. 31, 1972, p. 78.
Hoffait et al., "Nanovolt Transistor DC Amplifiers", Proceedings of the IEEE, Aug. 1963, p. 1147.
Okabe Yukio
Watanabe Yasuaki
Mullins James B.
Victor Company of Japan , Limited
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