Current mirror circuit and signal processing circuit having impr

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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327362, 327538, 323315, 323317, 330288, G05F 302

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active

057810613

ABSTRACT:
A current mirror circuit includes a current input terminal; a first FET and a second FET, each having a gate terminal, a drain terminal, and a source terminal, the gate terminal of the first FET being connected to the gate terminal of the second FET; a third FET having a source terminal connected to the drain terminal of the first FET, and a drain terminal and a gate terminal connected to each other and to the current input terminal; and a fourth FET having a source terminal connected to the drain terminal of the second FET, a gate terminal connected to the gate terminal of the third FET, and a drain terminal serving as a current output terminal. Therefore, even when the output voltage varies, since the current is almost constant, the circuit is not adversely affected by the variation in the output voltage. As a result, error in the output current in response to variations in the output voltage is significantly reduced.

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Miyashita et al., "A GaAs LD Driver IC For A 2.5 Gb/s Optical Communication System", 24th European Microwave Conference, vol. 2, Sep. 1994, pp. 1649-1654.

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