H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/32 (2006.01) H04L 27/00 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2154825
A dual-mode frequency and phase RF modulator (11) for use in a transmitter of a radiotelephone. A dual-mode modulation approach is employed wherein, in the analog (FM) mode of operation, a phase modulator, such as a .pi./4-shift DQPSK modulator, is bypassed and may be powered down. A frequency modulated RF carrier is coupled through a bypass circuit (52) to a modulator output node (50) for transmission from the radiotelephone. In the digital mode of operation, the bypass signal path is disabled, the .pi./4-shift DQPSK modulator is enabled, and in-phase (I) and quadrature (Q) signals are input to the .pi./4-shift DQPSK modulator which provides a phase modulated RF carrier that is coupled to the modulator output node for transmission from the radiotelephone. The teaching of this invention can be employed with radiotelephones having, by example, TDMA/analog capability or CDMA/analog capability.
Nokia Mobile Phones Ltd.
Sim & Mcburney
LandOfFree
Dual mode radiotelephone modulator 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 mode radiotelephone modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual mode radiotelephone modulator will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1343354