Low voltage operational amplifier bias circuit and method

Details Low voltage operational amplifier bias circuit and method Low voltage operational amplifier bias circuit and method

1996-03-19

1998-08-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330267, H03F 345, H03F 330

Patent

active

057986738

ABSTRACT:
Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0.degree. to 70.degree. centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. Source follower MOSFET (13) provides unity gain in transferring the AC signal, STAGE-1 OUTPUT, to the base of current sinking transistor (18). Sink control circuit (14) and source control circuit (22) generate the base drive currents for in transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current.

REFERENCES:
patent: 3914703 (1975-10-01), Stauffer
patent: 4394625 (1983-07-01), Sakai
patent: 4639685 (1987-01-01), Saller et al.
patent: 4990863 (1991-02-01), Susak et al.
patent: 5285170 (1994-02-01), Stockstad et al.
patent: 5491437 (1996-02-01), Rincon et al.
patent: 5606287 (1997-02-01), Kobayashi et al.
J. Fonderie et al., IEEE Journal of Solid-State Circuits, "Operational Amplifier with 1-V Rail-to-Rail Multipath-Driven Output Stage", vol. 26, No. 12, Dec. 1991, pp. 1817-1824.
Frank J.M. Thus, IEEE Journal of Solid-State Circuits, "A Compact Bipolar Class-AB Output Stage Using 1-V Power Supply", vol. 27, No. 12, Dec. 1992, pp. 1718-1722.

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