Transmission circuit by polar modulation system and...

Details Transmission circuit by polar modulation system and... Transmission circuit by polar modulation system and...

2007-01-03

2010-06-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S146000, C375S296000, C375S297000, C375S300000

Reexamination Certificate

active

07742543

ABSTRACT:
A transmission circuit alleviates the frequency characteristics of a group delay and an attenuation amount in a transmission signal band and expands a dynamic range to a high frequency band. A ladder-type resistance-type attenuator includes switching elements, 2R resistor elements and R resistor elements. The 2R and R resistor elements are respectively connected to variable capacitor elements in parallel. The variable attenuator having such a connection structure is connected to an amplitude modulation loop of the transmission circuit. By controlling the capacitance value of the variable capacitor elements using the capacitance value control section when the switching elements are ON/OFF switched based on the transmission power control signal, the influence of parasitic capacitances of the variable capacitor elements is suppressed and the group delay between the amplitude modulation and the phase modulation is reduced.

REFERENCES:
patent: 7023294 (2006-04-01), Hauger et al.
patent: 2003/0224743 (2003-12-01), Okada et al.
patent: 2004/0219891 (2004-11-01), Hadjichristos
patent: 1 667 330 (2006-06-01), None
patent: 2001-53631 (2001-02-01), None
patent: 2002-094357 (2002-03-01), None
patent: 2005/015757 (2005-02-01), None

Affiliated with

Also associated with

Rating

Transmission circuit by polar modulation system and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transmission circuit by polar modulation system and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission circuit by polar modulation system and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4246047