Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1983-07-01
1985-05-14
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330151, H03F 345
Patent
active
045175241
ABSTRACT:
An operational amplifier includes a differential input stage and a composite differential amplifier second stage. The second stage includes first and second NPN transistors which receive at their base terminals the differential output of the first stage. The emitters of these transistors are coupled respectively to the base electrodes of first and second PNP transistors which act, in conjunction with a current mirror circuit, to produce a single ended output which is applied to the operational amplifiers output stage. A first capacitor is coupled between the base electrode of the first NPN transistor and the emitter electrode of the second PNP transistor while a second capacitor is coupled between the base electrode of the second NPN transistor and the emitter electrode of the first PNP transistor. These capacitors serve to speed the high frequency performance of the differential second stage and therefore the entire operational amplifier.
REFERENCES:
patent: 3538449 (1970-11-01), Solomon
Dobkin, "Feedforward Compensation Speeds Op Amp", Electronics, vol. 42, No. 10, May 12, 1969, pp. 61, 62.
Electronic Design, vol. 21, No. 4, Feb. 15, 1973, p. A9.
Ingrassia Vincent B.
Motorola Inc.
Mullins James B.
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