Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1985-05-20
1986-08-12
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330288, H03F 345
Patent
active
046059075
ABSTRACT:
An adjustable current mirror, responsive to a single polarity balance control signal that may be derived using feedback, is described. The current mirror amplifier comprises first means for providing a first current path, the first means including reference transistor means for providing a current level control signal, issued relative to a reference potential, that corresponds to the current level of the first current path, second means for providing a second current path, the second means including current control transistor means for controlling the current level of the second current path, the current control transistor means being responsive to the current level control signal, and adjust transistor means, provided in series with the reference transistor means in the first current path, for adjusting the current level control signal by effectively modifying the reference potential, seen by the first means, in response to the balance control signal. The current balance between the first and second conduction paths may be directly modified by the resulting effective adjustment of the transconductance of the transistor means in the first conduction path with minimal addition of circuit components and a corresponding minimal impact on nominal current mirror amplifier circuit operation.
Gray Richard L.
Rosenthal Bruce D.
Teledyne Industries Inc.
Wan Gene
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