Receiver for wireless communication systems and I/Q signal...

Details Receiver for wireless communication systems and I/Q signal... Receiver for wireless communication systems and I/Q signal...

2006-01-24

2008-11-11

Vuong, Quochien B (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S313000, C455S334000, C375S324000

Reexamination Certificate

active

07450925

ABSTRACT:
A receiver includes first switches for applying either differential signals of an oscillator or a data signal of a transmitter to down-converting mixers; a frequency conversion unit for mixing and applying to the down-converting mixers quadrature signals generated from an arbitrary clock signal generator and the oscillator, and having a PPF for changing a phase difference of I/Q signals according to a control voltage externally applied; a phase difference detection part for checking a phase difference between the I/Q signals and generating the control voltage to be applied to the PPF according to the phase difference so as to correct the phase difference; third switches for applying the data signal processed through the down-converting mixers, filters, and amplifiers to A/D converters and applying the I/Q signals having a predetermined frequency to the phase difference detection part; and a control unit for switching the first and third switches.

REFERENCES:
patent: 6483355 (2002-11-01), Lee et al.
patent: 6888905 (2005-05-01), Cheah et al.
patent: 6904103 (2005-06-01), Okanobu
patent: 6904538 (2005-06-01), Glas et al.
patent: 6922555 (2005-07-01), Mohindra
patent: 7058380 (2006-06-01), Sato

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