High swing, low power output stage for an operational amplifier

Details High swing, low power output stage for an operational amplifier High swing, low power output stage for an operational amplifier

1996-02-13

1998-04-14

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330292, H03F 345, H03F 114

Patent

active

057397210

ABSTRACT:
A high swing, low power output stage for an operational amplifier is provided which includes: 1) a folded-cascode gain stage having a differential pair of natural V.sub.T devices, which are preferably P-channel transistors; 2) a source-follower input stage connected to the folded-cascode gain stage and to the input of the high swing output stage; and 3) a source-follower output stage connected to the folded-cascode gain stage connected to an output of the source-follower stage and to the output of the high swing output stage. The high swing output stage also includes a compensation capacitor which is used to provide dominant pole frequency compensation for the high swing output stage.

REFERENCES:
patent: 5212455 (1993-05-01), Pernici et al.
patent: 5406220 (1995-04-01), Jones et al.
patent: 5457426 (1995-10-01), Brehmer
patent: 5477190 (1995-12-01), Brehmer et al.
patent: 5493251 (1996-02-01), Khambaty et al.
patent: 5515003 (1996-05-01), Kimura
patent: 5589785 (1996-12-01), Garavan
R.K. Hester, et al., "Fully Differential ADC with Rail-to-Rail Common-Mode Range and Nonlinear Capacitor Compensation," IEEE Journal of Solid-State Circuits, vol. 25, No. 1, pp. 173-182 (2/90).
M. Milkovic, "Current Gain High-Frequency CMOS Operational Amplifiers," IEEE Journal of Solid-State Circuits, vol. SC-20, No. 4, pp. 845-851 (8/85).

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