Linear high-frequency amplifier with high input impedance and hi

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier

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330301, H03F 326

Patent

active

058444432

ABSTRACT:
A high-frequency power amplifier circuit offers the advantages of high input impedance, good linearity, high power efficiency and accurate bias current control in a compact and economical circuit configuration. The amplifier includes a single-ended output stage driven by a symmetrical push-pull emitter follower stage with both active pull-down and active pull-up capability. The emitter follower stage is driven by an active phase-splitter stage, with bias current for the phase-splitter stage and subsequent stages being provided by a bias-current control stage which is directly connected to the phase splitter stage. A linear voltage-to-current converter stage receives a high-frequency input voltage and provides a high-frequency current signal to the input terminal of the bias-current control stage that controls the current in the output stage.

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patent: 4442409 (1984-04-01), Preslar
patent: 4502020 (1985-02-01), Nelson et al.
patent: 4893091 (1990-01-01), Lillis et al.
patent: 5049834 (1991-09-01), Kasai
patent: 5365198 (1994-11-01), Wong
patent: 5424686 (1995-06-01), Wong et al.

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