H - Electricity – 03 – L
Patent
H - Electricity
03
L
H03L 7/18 (2006.01) H03C 3/09 (2006.01) H03J 7/02 (2006.01)
Patent
CA 2087719
An improved frequency synthesizer (100) capable of producing true DC frequency modulation without the need to DC fre- quency modulate the reference oscillator. The synthesizer (100) includes a phase comparator (104) which compares the reference signal (102) and the feedback signal (112). The output of said phase comparator (104) is filtered and coupled to the main VCO (108). A balanced image mixer (200) mixes the two signals from the main VCO (108) and an offset VCO (300). The offset VCO (300) is a low frequency (e.g. 100 to 300 KHz) integrated offset VCO (308) whose center frequency is controlled accurately, by means of matching to a VCO (306) which is controlled by a feedback loop, and by using an image balanced mixer (200) to reduce the image response to substantially reduce or eliminate the filtering required at the mixer output. The configuration of the offset mixer within the synthesizer loop, any residual spurious content due to imperfect image balance or carrier feedthrough of the mixer is attenuated by the loop response. The output signal of the mixer (200) is looped back to the phase comparator (104) after being divided by N through a divider (114).
Gowling Lafleur Henderson Llp
Motorola Inc.
LandOfFree
Frequency modulated synthesizer using low frequency offset... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency modulated synthesizer using low frequency offset..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency modulated synthesizer using low frequency offset... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1877469