Amplifier having bias circuit self-compensating for VGS process

Details Amplifier having bias circuit self-compensating for VGS process Amplifier having bias circuit self-compensating for VGS process

1999-07-23

2000-08-29

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, 330270, H03F 326

Patent

active

061114642

ABSTRACT:
An LDMOS RF amplifier having a bias voltage generated through feedback around an LDMOS sense transistor has a sense transistor, a current sensing circuit that monitors current in the sense transistor, and a bias voltage generation circuit controlled by an output of the current sensing circuit. The bias voltage from the bias voltage generation circuit is applied to the gates of both the sense transistor and an LDMOS RF power amplifier transistor. An AC-coupled RF input signal is applied through typical impedance-matching circuitry to the gate of the RF power amplifier transistor, and an AC-coupled output signal is tapped from, and power applied to, the drain of the RF power amplifier transistor through impedance matching circuitry of the type known in the art.

REFERENCES:
patent: 4963837 (1990-10-01), Dedic
patent: 5055796 (1991-10-01), Schaffer
patent: 5973564 (1999-10-01), Ivanov

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