Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1991-09-23
1993-05-18
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
330257, H03F 345
Patent
active
052124584
ABSTRACT:
A current mirror compensation circuit is disclosed herein which automatically adjusts the operating conditions of a current mirror so as to compensate for the voltage dependent current characteristics of a current load which a current mirror output is intended to match. In one embodiment, this compensation circuit compares a voltage level at the output of a current source with a voltage level at a corresponding node in the current programming portion of a current mirror. If a difference in these voltages is detected, the compensation circuit adjusts the current flow through the current programming portion of the current mirror to be equal to the output current through the current source. Therefore, since the current mirror output portion mirrors the current through the programming position, the currents through the output portion will match the current through the current source.
REFERENCES:
patent: 4992755 (1991-02-01), Seevinck et al.
Burd Robert C.
Fitzpatrick Mark E.
Mottola Steven
Triquint Semiconductor, Inc.
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