Re-sampling circuit and modulator using same

Details Re-sampling circuit and modulator using same Re-sampling circuit and modulator using same

1997-01-10

1998-06-09

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

341 61, 375279, 375308, 375354, H03M 700, H04L 2720

Patent

active

057641137

ABSTRACT:
A re-sampling circuit includes a poly-phase finite impulse response (FIR) interpolator; a polynomial interpolator having a sample input connected to a sample output of the poly-phase FIR interpolator; and a numerically controlled oscillator (NCO) having an output partitioned into: Nc integer bits connected to a control input of the FIR interpolator, and Nf fractional bits connected to a control input of the polynomial interpolator. The circuit may also include a reference clock for generating a reference clock signal. The NCO preferably further comprises a sample clock generator for generating a sample clock signal based on the reference clock signal, and the FIR interpolator further has a sample clock input for receiving the sample clock signal from the sample clock generator. In addition, the polynomial interpolator also preferably has an input for clocking output samples therefrom that is connected to the reference clock so that output samples from the polynomial interpolator are clocked out based upon the reference clock signal. The re-sampling circuit may be used in a modulator, for example, also including one or more mixers.

REFERENCES:
patent: 4756008 (1988-07-01), Yagi et al.
patent: 5412352 (1995-05-01), Graham
patent: 5412693 (1995-05-01), Bolla et al.
patent: 5425057 (1995-06-01), Paff
patent: 5513209 (1996-04-01), Holm
Harris Semiconductor Product Description for Model No. HSP45116A "Numerically Controlled Oscillator/Modulator", Jul. 1996, pp. 1-16.
Harris Semiconductor Product Description for Model No. HSP43168/883 "Dual FIR Filter", Jan. 1994, pp. 3-169 to 3-189.

Affiliated with

Also associated with

Rating

Re-sampling circuit and modulator using same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Re-sampling circuit and modulator using same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Re-sampling circuit and modulator using same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2204874