Time-delay compensating wideband class-s modulator and method th

Details Time-delay compensating wideband class-s modulator and method th Time-delay compensating wideband class-s modulator and method th

1996-11-26

1998-11-17

Mottola, Steven

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

058381937

ABSTRACT:
A time-delay compensating class-S modulator (4) receives an input signal (10) having RF envelope information and generates a delay error signal (18) from a comparison to an attenuated output signal. The delay error signal (18) is pulse-width modulated using a reference waveform (26) from a waveform generator (25). The envelope becomes a pulse-width modulated signal and is level-shifted and amplified through a pre-driver (40). A driver (50) controls switches (60, 70) which drive an output (80) into a low-pass filter (90) wherein the envelope is restored to the amplified signal for driving a power amplifier in a wide-band transceiver.

REFERENCES:
patent: 4504793 (1985-03-01), Yokoyama
patent: 4949048 (1990-08-01), Tokumo et al.
patent: 5479337 (1995-12-01), Voight
An article entitled "RF Modulators, Class-S High-Efficiency Amplitude Modulator", by Frederick H. Raab and Daniel J. Rupp, from May 1994 RF Design.

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