Intermediate frequency stage and signal processor used in...

Details Intermediate frequency stage and signal processor used in... Intermediate frequency stage and signal processor used in...

2006-02-28

2006-02-28

Tsang, Fan (Department: 2645)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S313000, C455S334000

Reexamination Certificate

active

07006812

ABSTRACT:
A signal processing circuit in a digital portable telephone apparatus having a GPS function has a phase shifter for making an I signal and a Q signal obtained by demodulating a BPSK modulated signal coincide with each other in phase and an adder for combining both the signals (I and Q signals) after the phase coincidence with each other. Therefore, a receiving IF stage normally used in a portable telephone apparatus is used also as an IF stage for a GPS receiving system.

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K. Boehm et al, ‘An IF Digitizing Receiver for a Combined GPS/GSM Terminal’, 1998, RAWCOM Proceedings '98 in IEEExplore, pp. 39-42.

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