Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1979-04-17
1981-03-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
042583314
ABSTRACT:
An improved differential amplifier includes a pair of PNP transistors Q.sub.1 and Q.sub.2, in which an input signal on a signal input terminal IN is applied to the base of the transistor Q.sub.1. The base of an NPN transistor Q.sub.5 is connected to the base of the transistor Q.sub.1 to absorb the base current of the transistor Q.sub.1. A load circuit comprising a transistor Q.sub.6 and a variable resistor R.sub.5 is connected in series to the transistor Q.sub.5 and a current mirror circuit is coupled to the differential amplifier. The load circuit implements current mirror operation together with the current mirror circuit, whereby the input terminal voltage of the differential amplifier is maintained at substantially zero potential when no input signal is received irrespective of the variations of power source voltages.
REFERENCES:
patent: 3717821 (1973-02-01), Amemiya et al.
Mullins James B.
Pioneer Electronic Corporation
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