Method to improve CMFB phase margin of...

Details Method to improve CMFB phase margin of... Method to improve CMFB phase margin of...

2006-12-12

2006-12-12

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S177100, C455S200100, C455S232100, C455S277200

Reexamination Certificate

active

07149492

ABSTRACT:
An improved method and apparatus for using common mode feedback to maintain a predetermined DC level for an intermediate frequency output signal. A common mode feedback capacitor-select switch module is operable to use a bandwidth control signal from a radio interface of a wireless device to selectively connect a plurality of common mode feedback capacitors to an operational amplifier, thereby generating a common mode feedback signal as an input to an active mixer conversion gain module. The predetermined combination of common mode feedback capacitors is used in combination with a plurality of bandwidth capacitors to generate an overall capacitance that maintains the bandwidth of the system at a predetermined value. A predetermined capacitance value is “shifted” from the bandwidth capacitor bank to the CMFB capacitor bank, thereby providing an overall ratio that maintains the bandwidth while defining a predetermined capacitance connected to the operational amplifier to generate a desired common mode feedback signal that maintains the phase margin of the output signal at a predetermined level.

REFERENCES:
patent: 4857928 (1989-08-01), Gailus et al.
patent: 7031668 (2006-04-01), Darabi et al.
patent: 2004/0264802 (2004-12-01), Kondo

Affiliated with

Also associated with

Rating

Method to improve CMFB phase margin of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method to improve CMFB phase margin of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to improve CMFB phase margin of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3720390