Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1996-01-02
2000-05-16
Faile, Andrew I.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
375247, 341 77, H04B 126, H04B 128
Patent
active
060648716
ABSTRACT:
A low power passive .SIGMA..DELTA. converter for baseband applications and with a built in mixer for direct conversion. For direct conversion, low power consumption is achieved by adopting a passive loop filter for the .SIGMA..DELTA. converter together with merging the sampling and mixing functions together utilizing a specially designed mixer. With a passive loop filter, the only gain element in the loop is a high gain, high speed, low noise comparator. The mixer can be located outside of the feedback loop, although according to one aspect of the present invention, the mixer is incorporated inside the feedback loop. For baseband applications, the same design is utilized with a simple sampling switch instead of a mixer for processing baseband signals with low power consumption.
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Roettcher et al., A Compatible CMOS-JFET Pulse Density Modulator for Interpolative High-Resolution A/D Conversion, IEEE Journal of Solid-State Circuits, vol. SC-21, No. 3, pp. 446-452, Jun. 1986.
Longo et al., FA 14.1: A 15b 30kHz Bandpass Sigma-Delta Modulator, Digest of Technical Papers, 1993 IEEE International Solid-State Circuits Conference; pp. 226-227; 1993.
Boccio Vincent F.
Faile Andrew I.
University of Waterloo
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