Wireless transmitter having a modified translation loop...

Details Wireless transmitter having a modified translation loop... Wireless transmitter having a modified translation loop...

2005-10-04

2005-10-04

Tran, Pablo N. (Department: 2685)

Telecommunications

Transmitter

Frequency conversion

C455S091000, C455S095000, C455S112000, C331S004000, C375S354000, C375S376000

Reexamination Certificate

active

06952569

ABSTRACT:
A transmitter for a wireless handset having a modified translation loop architecture. The transmitter includes a VCO that generates a modulated transmit signal having a frequency fTx, and a modulated signal source that generates a modulated LO signal with a frequency fLO. A mixer mixes the transmit signal with the LO signal to produce an IF signal having a frequency fIF. A first divider divides the LO signal frequency fLOby an integer M to generate a first comparison signal having a frequency fCF. A second divider divides the IF signal frequency fIF, after it is multiplied by an integer K, by an integer N to generate a second comparison signal having a frequency fCF. The transmit and LO signal frequencies have the relationshipfTx=fLO⁢KM±NM.A phase detector coupled to the first and second comparison signals compares the phases of the signals and outputs a control voltage to the VCO proportional to any phase differences between the signals.

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Tham et al., A 2.7V 900MHz/1.9GHz Dual-Band Transceiver IC for Digital Wireless Communication, May 11, 1998, pp. 559-562.

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