Demodulator structure utilizing DC switches

Details Demodulator structure utilizing DC switches Demodulator structure utilizing DC switches

2006-05-02

2006-05-02

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Receivers

Angle modulation

C375S340000, C455S318000, C455S323000, C455S334000

Reexamination Certificate

active

07039129

ABSTRACT:
The present invention relates to an I/Q demodulator (21) comprising a n-port structure (1,16) is provided, wherein n is an integer value of 4,5 or 6. The demodulator (21) is supplied at a first input (3) with a RF signal (2) which has to be demodulated. At a second input (5) it is supplied with a second RF signal (4). The n−2 output signals (6) are detected by power sensors (7). After low pass filtering (14) the output signals of the power sensors (7) are multiplexed by a multiplexing means (8).

REFERENCES:
patent: 4521728 (1985-06-01), Li
patent: 6075980 (2000-06-01), Scheck
patent: 6115593 (2000-09-01), Alinikula et al.
patent: 6337888 (2002-01-01), Huang et al.
patent: 6650178 (2003-11-01), Brankovic et al.
patent: 0 805 561 (1997-11-01), None
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J. Li et. al.: “A Six-Port Direct Digital Millimeter Wave Receiver” 1994 IEEE MTT-S International Microwave Symposium Digest, vol. 3, May 23, 1994, pp. 1659-1662, XP000512814.

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