To provide a method and a system for linearizing a power amplifier.
A transmitter that directly modulates a high frequency carrier accompanied with a composite base band waveform is provided with a programmable device that totally generates amplitude and phase information corresponding to the composite base band waveform, a signal generator that generates the high frequency carrier whose phase is in response to the phase information generated by the programmable device, a plurality of delta modulators and an amplifier that is coupled with the signal generator and receives the high frequency carrier accompanied with the phase information. Each of the delta modulators is operated to sample an error signal at a time interval shifted from that of all other delta modulators to generate a pulse stream totally approximating an amplitude signal. The voltage supplied to the amplifier is adjusted according to approximated amplitude information expressed by the pulse stream generated by the delta modulator. The supplied voltage is adjusted to be nearly linearly changed with its change. This method applies both the amplitude information and the phase information onto the high frequency carrier.
HEANEY EUGENE PATRICK
NAGLE PIERCE JOSEPH
| JPH06303042A | 1994-10-28 | |||
| JPH05175743A | 1993-07-13 | |||
| JPH07249947A | 1995-09-26 | |||
| JPH0334709A | 1991-02-14 | |||
| JPH0677740A | 1994-03-18 | |||
| JPH06303042A | 1994-10-28 | |||
| JPH05175743A | 1993-07-13 | |||
| JPH07249947A | 1995-09-26 | |||
| JPH0334709A | 1991-02-14 | |||
| JPH0677740A | 1994-03-18 |
| WO1999018663A1 | 1999-04-15 | |||
| WO1999018663A1 | 1999-04-15 |