Quadrature demodulator and interrogator

Details Quadrature demodulator and interrogator Quadrature demodulator and interrogator

2007-02-22

2009-02-03

Chang, Daniel D (Department: 2819)

Demodulators

Phase shift keying or quadrature amplitude demodulator

C329S308000, C375S329000, C455S041200

Reexamination Certificate

active

07486131

ABSTRACT:
In a receiving section, a first mixer and a second mixer generate an I signal and a Q signal from a modulated reception signal, a local signal, and a local signal obtained by shifting a phase by 90 degrees. These I signal and Q signal are supplied to a digital signal processing section via a low path filter, a capacitor, a variable gain amplifier, and an ADC. In addition, the generated I signal and Q signal are directly supplied to the digital signal processing section. The digital signal processing section detects a sign of the I signal and a sign of the Q signal, the signals being directly input. In addition, the detected sign of the I signal is multiplied with the I signal input from the ADC, and then, the detected sign of the Q signal is multiplied with the Q signal input from the ADC, whereby the signs are commonly established in a positive state. Then, the I signal and the Q signal are added, and decoded into two-values.

REFERENCES:
patent: 6122329 (2000-09-01), Zai et al.
patent: 6501807 (2002-12-01), Chieu et al.

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