High swing low power general purpose operational amplifier

Details High swing low power general purpose operational amplifier High swing low power general purpose operational amplifier

1996-02-13

1998-09-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330292, H03F 345, H03F 316

Patent

active

058050213

ABSTRACT:
An operational amplifier circuit is provided which includes: 1) a first folded-cascode gain stage having a differential pair of natural V.sub.T devices which are P-channel transistors; 2) a second gain stage connected to an output of the first folded-cascode gain stage; 3) a slave source follower stage connected to an output of the second gain stage; 4) a second folded-cascode stage connected to an output of the slave source follower stage; and 5) a source follower output stage connected to an output of the second folded-cascode gain stage. The high swing output stage of the operational amplifier, which includes stages 3-5 above, includes a pair of natural V.sub.T devices which are P-channel transistors.

REFERENCES:
patent: 5406220 (1995-04-01), Jones et al.
patent: 5457426 (1995-10-01), Brehmer
patent: 5477190 (1995-12-01), Brehmer et al.
patent: 5515003 (1996-05-01), Kimura
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 (Feb. 1990).
M. Milkovic, "Current Gain High-Frequency CMOS Operational Amplifiers," IEEE Journal of Solid-State Circuits, vol. SC-20, No. 4, pp. 845-851 (Aug. 1985).

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