Sampling system for radio frequency receiver

Details Sampling system for radio frequency receiver Sampling system for radio frequency receiver

1995-10-17

1998-11-24

Le, Amanda

Pulse or digital communications

Receivers

Amplitude modulation

375324, 375344, 329304, 329348, 329357, 329361, 348726, 455204, 455207, 455209, 455214, 455315, 455323, H04B 126, H03D 124, H04N 5455, H04N 546

Patent

active

058418148

ABSTRACT:
A radio frequency (rf) receiver adapted to receive a number of different digitally modulated rf input signals such as quadrature amplitude modulated (QAM) and vestigial side band (VSB) rf input signals includes circuitry for down converting the rf input signals to an intermediate frequency (IF) range having a center frequency fc2 and a bandwidth of Bhz and converter circuitry for sampling the IF signals and then producing corresponding baseband signals. In a preferred embodiment, the intermediate frequency signals are applied to a sample and hold circuit which is sampled at a frequency fs and whose output is coupled via a low pass filter to an analog-to-digital converter whose output is then applied to a Hilbert filter for demodulating the sampled signals and producing baseband signals. In-phase (I) and quadrature (Q) signals are produced whose phase and amplitude are not a function of different components and their tolerance of different conduction paths, as in the prior art.

REFERENCES:
patent: 5142553 (1992-08-01), Rosenkranz
patent: 5375146 (1994-12-01), Chalmers
patent: 5506636 (1996-04-01), Patel et al.
patent: 5557642 (1996-09-01), Williams
patent: 5640698 (1997-06-01), Shen et al.
patent: 5673293 (1997-09-01), Scarpa et al.
Groshong, et al., "Undersampling Techniques Simplify Digital Radio," Electronic Design, vol. 39, No. 10, May 23, 1991, pp. 67-68, 70, 73-75, 78.
Grant, T.L., "A versatile microprocessor-controlled hybrid receiver," NTC 78, Conference Record of the IEEE 1978 National Telecommunications Conference, Birmingham, AL, vol. 1, Dec. 3-6, 1978, pp. 2.1/1-5.

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