Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-05-21
1993-06-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330306, 330294, H03F 345
Patent
active
052183190
ABSTRACT:
A differential amplifier comprises a pair of current mirror circuits, a pair of constant current supplies and a pair of differential amplifier circuits. The first differential amplifier circuit is provided between the first current mirror circuit and the first constant current supply. The second differential amplifier circuit is positioned between the second constant current supply and the second current mirror circuit. The second differential amplifier circuit includes a pair of multicollector pnp transistors each having a first one of its collectors connected to the second current mirror circuit and a second one of its collectors connected to the second power supply. The first differential amplifier circuit performs differential amplification on an externally supplied input signal and an output signal of the second differential amplifier circuit, thereby to produce complementary differential output signals which are supplied as corresponding input signals to the second differential amplifier circuit and which performs differential amplification thereon and produces, as the output signal thereof, the output signal of the differential amplifier. A plurality of the differential amplifiers may be used in an active filter.
REFERENCES:
patent: 5063356 (1991-11-01), Voorman
Fukahori et al., "A High Precision Micropower Operational Amplifier", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec., 1979, pp. 1048-1058.
Fujitsu Limited
Mullins James B.
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