Differential amplifier circuit with rail-to-rail capability

Details Differential amplifier circuit with rail-to-rail capability Differential amplifier circuit with rail-to-rail capability

1983-08-23

1985-07-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330252, H03F 345

Patent

active

045324794

ABSTRACT:
A differential amplifier circuit contains a pair of complementary input portions (3, 5 and 4, 6). The input portions amplify a common differential input signal to produce corresponding amplified differential signals which are supplied to a summing section that operates as a modulated current mirror to produce an output signal representative of the input signal. The summing section contains a pair of like-polarity first and second amplifiers (13 and 14) and a pair of like-polarity third and fourth amplifiers (19 and 20) complementary to the other amplifiers. A pair of impedance elements (11 and 12) are coupled between a first voltage supply (ground reference) and the third and fourth amplifiers. A pair of current sources, typically impedance elements (8 and 9), are coupled between a second voltage supply (+B) and the first and second amplifiers. An important feature of this circuit is that the output signal changes with the differential portion of the input signal as its common-mode portion varies over the entire voltage range between the levels of the supplies.

REFERENCES:
patent: 4357578 (1982-11-01), Yokoyama
patent: 4377789 (1983-03-01), Hoover
Gray et al., "Recent Advances in Monolithic Operational Amplifier Design" IEEE Trans. Circs. and Systs. vol. CAS-21, May 1974.

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