Dual port modulator comprising a frequency synthesiser

Details Dual port modulator comprising a frequency synthesiser Dual port modulator comprising a frequency synthesiser

2006-09-19

2006-09-19

Chang, Joseph (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Pulse position, frequency, phase, or spacing modulator

C332S127000, C331S002000

Reexamination Certificate

active

07109816

ABSTRACT:
A dual-port modulator comprising a first Phase Locked Loop (‘PLL’) (15) including a first Voltage Controlled Oscillator (‘VCO’) (10), a first variable frequency divider (20), a first multi-accumulator sequence generator (21) responsive to a phase modulation signal for controlling the division ratio (1/Nr) of the first variable frequency divider, a first phase detector (30) responsive to the relative phases of the reference signal and the first frequency divider signal for producing a first control signal through a first low pass filter (40). The frequency synthesiser also comprises a second PLL (14) including a second VCO (201), the first control signal being applied to the tuning port of the second VCO (201), a second variable frequency divider (203), a second multi-accumulator sequence generator (204) responsive to a phase modulation signal (261) for controlling the division ratio (1/Nt) of the second variable frequency divider, and a second phase detector (202) responsive to the relative phases of the second VCO signal and the second frequency divider signal for applying a second control signal to the tuning port of the second VCO (201) through a second low pass filter (208), the first and second frequency dividers (20, 203) being arranged to divide the frequency of the first VCO signal, and the bandwidth of the first PLL (15) being substantially smaller than the bandwidth of the second PLL (14).The modulator is applicable in a transceiver also including a demodulator PLL (306, 307) including the second VCO (201), the modulator being arranged to be inactive during periods when the demodulator is active and the demodulator being arranged to be inactive during periods when the modulator is active, such as dual-standard transceiver operating according to WCDMA and PCS/DCS standards.

REFERENCES:
patent: 5021754 (1991-06-01), Shepherd
patent: 5111162 (1992-05-01), Hietala
patent: 5493700 (1996-02-01), Hietala
patent: 5495206 (1996-02-01), Hietala
patent: 5752175 (1998-05-01), Roullet
patent: 5856766 (1999-01-01), Gillig
patent: 6094569 (2000-07-01), Wang
patent: 6104222 (2000-08-01), Embree
patent: 6211747 (2001-04-01), Trichet
patent: 6553089 (2003-04-01), Huh et al.
patent: 6933798 (2005-08-01), Hammes et al.
patent: 10065657 (2002-07-01), None
Ritzberger et al., “Concepts for Complete Integration of Synthesizers for GHz Frequencies,” IEEE, 2000, pp. 412-417.

Affiliated with

Also associated with

Rating

Dual port modulator comprising a frequency synthesiser does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual port modulator comprising a frequency synthesiser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual port modulator comprising a frequency synthesiser will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3538791