Chopper-direct-conversion (CDC) radio architecture

Details Chopper-direct-conversion (CDC) radio architecture Chopper-direct-conversion (CDC) radio architecture

2007-02-13

2007-02-13

Orgad, Edan (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S205000, C455S204000, C455S203000, C455S047000, C455S104000, C455S109000, C455S048000, C375S321000, C375S270000, C375S277000

Reexamination Certificate

active

10440026

ABSTRACT:
A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband signal in a single mixing step. The phase-alternating mixer may be implemented by two parallel mixers each mixing the input signal with one of two local oscillator signals and an adder receiving and summing outputs from the two parallel mixers, by a track-and-hold circuit sampling the input signal based upon the local oscillator signal, or by a window averaging circuit averaging the input signal across a period of the local oscillator signal. The CDC architecture is suitable for fabrication on a single chip and offers solutions to virtually all problems found in conventional direct-conversion receivers.

REFERENCES:
patent: 4628518 (1986-12-01), Chadwick et al.
patent: 5584066 (1996-12-01), Okanobu
patent: 6714604 (2004-03-01), Tsurumi et al.
patent: 6731917 (2004-05-01), Krishna
patent: 6842077 (2005-01-01), Oga
patent: 6952570 (2005-10-01), Nagayasu
patent: 6961546 (2005-11-01), Rofougaran et al.
patent: 2003/0125005 (2003-07-01), Lee

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