Time-delay compensating wideband class-s modulator and method therefor
US5838193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Nov 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2171
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.