Current mirrors

Details Current mirrors Current mirrors

1999-10-12

2000-08-22

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, G05F 316

Patent

active

061077895

ABSTRACT:
A current mirror suitable, for example, for a charge pump circuit comprises a reference device (21), an output device (22), a first amplifier (41), a follower amplifier (42), and switches (31, 32 43, 44). When switches 31 and 43 are closed, the current mirror is enabled and the low output impedance of follower (42) ensures that the gate voltage of output device (22) quickly equals the gate voltage of reference device (21), switching on the output quickly and accurately. When output device (22) is off, switch (44) closes, and the output of the first amplifier (41) bypasses the follower (42) so that the first amplifier (41) and the reference device (21) form a loop, and compensation becomes easier. The amplifiers (41, 42) are separately compensated to make them stable.

REFERENCES:
patent: 3973215 (1976-08-01), Ahmed
patent: 4544878 (1985-10-01), Beale et al.
patent: 5113129 (1992-05-01), Hughes
patent: 5612614 (1997-03-01), Barrett, Jr. et al.
patent: 5734293 (1998-03-01), Gross
patent: 5798723 (1998-08-01), Fong
patent: 5867012 (1999-02-01), Tuthill
European Search Report, dated Apr. 19, 1999.

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