Noise immune current mirror

Details Noise immune current mirror Noise immune current mirror

1988-10-24

1989-09-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330149, H03F 130

Patent

active

048663999

ABSTRACT:
A conventional PNP transistor current mirror provides identical first and second reference currents each containing the same noise component (which may be due to high frequency supply voltage variations). An input current is subtracted from the first reference current to provide a difference current containing the noise component in the first reference current. An NPN current mirror subtracts the difference current from the second reference current such that the noise component in the difference current cancels the noise component in the second reference current to provide an output current which is an identical "mirror image" of the input current and which is free of the cancelled noise component.

REFERENCES:
patent: 3886435 (1975-05-01), Steckler
patent: 3925718 (1975-12-01), Wittlinger
patent: 4103249 (1978-07-01), Burdick
patent: 4413226 (1983-11-01), Davies
patent: 4435678 (1984-03-01), Joseph et al.
patent: 4536662 (1985-08-01), Fujii
patent: 4546307 (1985-10-01), Llewellyn
patent: 4578633 (1986-03-01), Aoki
patent: 4603290 (1986-07-01), Shinomiya

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