Local oscillator leakage control in direct conversion processes

Details Local oscillator leakage control in direct conversion processes Local oscillator leakage control in direct conversion processes

2005-11-01

2005-11-01

Mis, David (Department: 2817)

Oscillators

Beat frequency

Frequency or amplitude adjustment or control

C331S025000, C331S037000, C331S041000, C331S074000, C455S313000

Reexamination Certificate

active

06960962

ABSTRACT:
A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.

REFERENCES:
patent: 5307029 (1994-04-01), Schenk
patent: 6009312 (1999-12-01), Dolman
patent: 0798880 (1997-03-01), None
patent: 0031885 (2000-06-01), None
patent: 0052840 (2000-09-01), None

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