Compensation method and apparatus for enhancing single-ended to

Details Compensation method and apparatus for enhancing single-ended to Compensation method and apparatus for enhancing single-ended to

1990-08-13

1991-11-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330301, H03F 345

Patent

active

050686216

ABSTRACT:
A compensation method and apparatus for enhancing single-ended to differential conversion includes a compensation network that is coupled between the single-ended voltage input and the bias terminal of a differential stage. The compensation network has an impedance substantially equal to the impedance presented by the bias circuit used to bias the differential stage. Accordingly, the compensation network provides a current that substantially cancels the signal tail current supplied to the bias terminal of the differential stage, resulting in a balanced differential output. The compensation network may be AC coupled from the single-ended voltage input to the bias terminal in order to preserve the original DC operating condition. The compensation network may be chosen to provide more cancelling current at higher operating frequencies. Additionally, the compensation network can be configured to match a bias circuit built from resistors, transistors, current mirrors, or the like.

REFERENCES:
patent: 4612513 (1986-09-01), Seevinch

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