Demodulation circuit for ASK coded or amplitude modulated...

Details Demodulation circuit for ASK coded or amplitude modulated... Demodulation circuit for ASK coded or amplitude modulated...

2011-03-15

2011-03-15

Mis, David (Department: 2817)

Demodulators

Pulse or interrupted continuous wave demodulator

C329S361000, C375S320000, C375S353000

Reexamination Certificate

active

07907005

ABSTRACT:
Conventional modulation envelope demodulators for amplitude modulated signals (e.g. ASK coded signals RX) contain rectifier elements which extract a baseband signal BB. Disadvantageously, due to a non-linear characteristic of the rectifier elements, an amplitude of the baseband signal BB depends on an amplitude of the high-frequent carrier signal. The present invention discloses an improved demodulation circuit for demodulating of ASK coded or amplitude modulated signals. This is achieved by using a sampling mixer4and a phase adjusting regulation loop (5) by means of which the sampling of the ASK coded signal RX at its maxima is performed with high accuracy. Due to the absence of any rectifying elements, the baseband signal BB can be fully extracted from the ASK coded signals RX.

REFERENCES:
patent: 4253066 (1981-02-01), Fisher et al.
patent: 0412427 (1991-02-01), None
patent: 97/48180 (1997-12-01), None

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