Method and apparatus for operating a radio-frequency power ampli

Details Method and apparatus for operating a radio-frequency power ampli Method and apparatus for operating a radio-frequency power ampli

1999-01-07

2000-03-28

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330297, H03F 338

Patent

active

060437073

ABSTRACT:
A variable-class linear amplifier (600, 800, 900) applies a supply type of envelope modulation to an RF power amplifier operating in or near compression at highest envelope amplitudes, and transitions gradually to an envelope tracking type of operation at intermediate envelope amplitudes. The amplifier further transitions gradually to a linear class of operation with a constant supply voltage (508) at lowest envelope amplitudes.

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patent: 5973556 (1999-10-01), Su
Leonard R. Kahn, "Single-Sideband Transmission by Envelope Elimination and Restoration", pp. 803-806, 1952, USA.

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