Direct modulation architecture for amplitude and phase...

Details Direct modulation architecture for amplitude and phase... Direct modulation architecture for amplitude and phase...

2006-08-22

2006-08-22

Tran, Khai (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S294000

Reexamination Certificate

active

07095819

ABSTRACT:
Multiple-mode direct phase/amplitude modulation circuitry (20) for use in a transceiver (17) of a device such as a wireless handset (10) is disclosed. The modulation circuitry (20) includes a modulation loop (36) for modulating a phase signal into a Gaussian-Minimum-Shift-Keyed (GMSK) signal for transmission in a first mode. The modulation loop (36) may include a phase-locked loop (45) with its frequency controlled by a Σ-Δ demodulation of a compensated version of the phase signal, or alternatively may produce a modulated signal from a direct digital synthesis circuit (70; 70′). An amplitude signal is converted into an analog signal and applied to a single-sideband mixer (43) for combination with a frequency multiplied version of the phase-modulated signal (GMSK(t); PH(t)), producing an amplitude and phase modulated signal for transmission in a second mode.

REFERENCES:
patent: 5726609 (1998-03-01), Lindholm
patent: 6008703 (1999-12-01), Perrott et al.
patent: 6047029 (2000-04-01), Eriksson et al.
patent: 6239660 (2001-05-01), Dekker
patent: 6433835 (2002-08-01), Hartson et al.
patent: 6937668 (2005-08-01), Sridharan et al.

Affiliated with

Also associated with

Rating

Direct modulation architecture for amplitude and phase... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct modulation architecture for amplitude and phase..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct modulation architecture for amplitude and phase... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3711838