Automatic bias control circuit for reduced current...

Details Automatic bias control circuit for reduced current... Automatic bias control circuit for reduced current...

2007-09-21

2008-08-19

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C330S285000

Reexamination Certificate

active

07414479

ABSTRACT:
According to an exemplary embodiment, an amplification module includes a power amplifier configured to receive an RF input signal and provide an RF output signal. The amplification module further includes an autobias control circuit configured to receive and convert the RF output signal to a control signal. The control signal can cause the power amplifier to have a quiescent current that increases substantially linearly in response to an increase in the RF output power of the RF output signal. The autobias control circuit can include a peak detector/log converter circuit coupled to a first input of a differential amplifier, where the differential amplifier outputs the control signal. The autobias control circuit can further include a DC reference circuit coupled to a second input of the differential amplifier. The amplification module further includes an analog bias circuit coupling the control voltage to a bias input of said power amplifier.

REFERENCES:
patent: 5311143 (1994-05-01), Soliday
patent: 6784740 (2004-08-01), Tabatabaei
patent: 7049891 (2006-05-01), Yuen

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