Gain enhancement for amplifier using a replica amplifier

Details Gain enhancement for amplifier using a replica amplifier Gain enhancement for amplifier using a replica amplifier

1993-09-16

1995-07-18

Mullins, James B.

Amplifiers

Signal feedback

Plural amplifier channels

330124R, 330149, 330295, H03F 368

Patent

active

054345383

ABSTRACT:
A main amplifier has an enhanced gain due to current injection from a replica amplifier which has a similar structure and feedback network to that of the main amplifier. The main amplifier has a transconductance stage and an output resistance stage. A coupling transconductance stage receives the same input signal as that received by the main and replica amplifiers and injects a current to the output node of the main amplifier. The injected current is the same as the current to the output node would have been from the main amplifier's transconductance stage, were the replica amplifier not present. The gain can be obtained without a cascode and with short-channel CMOS technology that operates at a low supply voltage. The gain is increased without causing an increase in the output resistance, and without causing a decrease in the common-mode input range or the output swing.

REFERENCES:
patent: 3944944 (1976-03-01), Ellenbecker
patent: 4794349 (1988-12-01), Senderowicz et al.
patent: 5153529 (1992-10-01), Koda et al.

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