Subharmonic quadrature sampling receiver and design

Details Subharmonic quadrature sampling receiver and design Subharmonic quadrature sampling receiver and design

1997-01-03

1999-08-10

Pham, Chi H.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375376, H03D 100, H03D 324

Patent

active

059370130

ABSTRACT:
A receiver for down-converting a modulated carrier into its in-phase (I) and quadrature (Q) components for further processing is proposed. This is accomplished using a sampling method in which the signal is sampled directly using a sampling circuit which is driven by a single sampling clock frequency substantially lower than the carrier frequency while allowing the I and Q components to be precisely obtained. Each of the signal samples comprises sub-samples taken successively which represent the in-phase, quadrature, negative in-phase and negative quadrature components of the signal. The negative components permit flexible application of the invention in several modes, including differential mode for the removal of common-mode noise. The invention is useful because it provides an integrated circuit means for precisely obtaining I and Q components of a very high frequency modulated carrier. This greatly eases the difficulty of implementing receiver architectures such as direct down-conversion or low-IF receivers, which permit on-chip integration of traditionally difficult-to-integrate components such as IF filters and VCO circuits while eliminating the need for image-rejection filters.

REFERENCES:
patent: 5490176 (1996-02-01), Peltier
patent: 5727027 (1998-03-01), Tsuda
patent: 5729173 (1998-03-01), Sato

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