Fast slewing amplifier using dynamic current mirrors

Details Fast slewing amplifier using dynamic current mirrors Fast slewing amplifier using dynamic current mirrors

1994-11-18

1996-04-23

Mullins, James B

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330263, H03F 330

Patent

active

055107540

ABSTRACT:
An amplifier input stage solves the problem of response to large signal (slewing) conditions being limited by the amplifier being dependent on constant current to charge capacitances at certain nodes in the amplifier. In general, in order to achieve faster slewing one must undesirably provide more quiescent current. Instead, by providing dynamic current sources for driving transistors in the amplifier input stage, a low level of quiescent current is maintained while a high output level of current is provided during slewing. This allows rapid charging/discharging of the capacitances at nodes in the amplifier signal path, while conserving power.

REFERENCES:
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patent: 4791383 (1988-12-01), Monticelli et al.
patent: 4827223 (1989-05-01), Gross
patent: 4833424 (1989-05-01), Wright
patent: 4894622 (1990-01-01), Buitendijk
patent: 4970470 (1990-11-01), Gosser
patent: 5049653 (1991-09-01), Smith et al.
patent: 5150074 (1992-09-01), Gosser
patent: 5218321 (1993-06-01), Jost
patent: 5323122 (1994-06-01), Bowers
patent: 5339042 (1994-08-01), Kaire et al.
U.S. pending patent application Ser. No.: 08/340,556, filed Nov. 16, 1994, Title: Amplifier Stage Having Compensation for NPN, PNP Beta Mismatch and Improved Slew, Attorney Docket No. NS-2605 US.
U.S. pending patent application Ser. No.: 08/362,030, filed Dec. 22 1994, Title: Triple Buddered Amplifier Output Stage, Attorney Docket No. NS-2607 US.

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