Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1990-11-29
1992-03-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323315, 330311, H03F 316
Patent
active
050992058
ABSTRACT:
A balanced cascode current mirror includes first and second current paths respectively defined by first and second transistors and by third and fourth transistors. Each current path may include the sources and drains of the transistors in such path. Connections may respectively extend between the gates of the first and third transistors and between the gates of the second and fourth transistors to provide the first and third transistors with substantially identical source, gate, and drain impedances. An input current is introduced to the drain of the second transistor and an output current with substantially identical characteristics is obtained from the drain of the fourth transistor. A capacitance may be connected between the drain of the second transistor and the gate of the first transistor to produce a flow of current at high frequencies through the first current path corresponding to the input current at the drain of the second transistor. A fifth transistor may be connected in a circuit with a constant current source to regulate the current through the first and second transistors to be substantially equal to the input current at low frequencies. The gate of the fifth transistor may be connected to the drain of the second transistor, and the source of the fifth transistor may be connected to the gate of the first transistor, to provide this current regulation. The gates of the second and fourth transistors and the drain of the fifth transistor may have a common reference potential such as ground.
REFERENCES:
patent: 4866399 (1989-09-01), Gose
Brooktree Corporation
Mullins James B.
Roston Ellsworth R.
Schwartz Charles H.
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