Bias circuit and control method for bias circuit

Details Bias circuit and control method for bias circuit Bias circuit and control method for bias circuit

2011-04-05

2011-04-05

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

Reexamination Certificate

active

07920028

ABSTRACT:
A bias circuit for applying a bias voltage to a nonlinear amplification circuit, including a constant-current source; and a first, second, third, and fourth transistors, wherein a current mirror circuit is configured by the first transistor and the second transistor, and the bias voltage is outputted from the drain of the second transistor, gate lengths and gate widths of the first and second transistor are the same, gate lengths of the first to fourth transistor are the same, and gate lengths and gate widths of the first, second, third, and fourth transistor are configured so that k4−0.5−k3−0.5is approximately 1, where k3stands for a ratio of a gate width of the third transistor to the gate width of the first transistor and k4stands for a ratio of a gate width of the fourth transistor to the gate width of the first transistor.

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