Regulating the gain of a circuit including a programmable curren

Details Regulating the gain of a circuit including a programmable curren Regulating the gain of a circuit including a programmable curren

1998-04-21

2000-09-19

Shingleton, Michael B.

Amplifiers

With periodic switching input-output

330 69, 330258, 327307, H03F 102

Patent

active

061218308

ABSTRACT:
The invention relates to programmable amplifiers, more specifically to structural solutions of amplifiers realised on integrated circuits. In the amplifier according to the invention a differential voltage-mode input signal is converted into a differential current signal and at least part of the common-mode component is removed from the differential current signal. An offset current is added to the differential current signal and the magnitude of the offset current is adjusted according to the gain, thus preventing the common-mode current from becoming too large at the amplification stage. The differential current signal is amplified using programmable current amplifiers realised by current mirrors and converted back into a voltage-mode signal.

REFERENCES:
patent: 5233634 (1993-08-01), Vaisanen
patent: 5329191 (1994-07-01), Korhonen et al.
patent: 5331638 (1994-07-01), Honkasalo et al.
patent: 5557639 (1996-09-01), Heikkila et al.
patent: 5596677 (1997-01-01), Jarvinen et al.
patent: 5841318 (1998-11-01), Cram

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