Automatic biasing and protection circuit for field effect...

Details Automatic biasing and protection circuit for field effect... Automatic biasing and protection circuit for field effect...

2006-04-28

2008-03-25

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S285000, C330S085000

Reexamination Certificate

active

07348854

ABSTRACT:
A transistor biasing circuit is shown that utilizes a negative feedback loop control circuit to set the gate bias voltage in the output transistors of a power amplifier. This control circuit has a current sensor in series with the drain of the transistor, the current sensor output in turn feeding a dc signal into a dc amplifier, and the output of the dc amplifier driving a gate bias integrator which forms a dc control loop for maintaining the bias point. The output transistor is protected from excessive temperature and/or excessive power dissipation.

REFERENCES:
patent: 3509460 (1970-04-01), Mizrahi
patent: 4459553 (1984-07-01), Diller
patent: 7113043 (2006-09-01), Jin et al.

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