Digital quadrature modulator and method for testing the same

Details Digital quadrature modulator and method for testing the same Digital quadrature modulator and method for testing the same

1993-03-31

1995-07-11

Dolinar, Andrew M.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

371 201, 375 101, G01R 313187, H04B 1700

Patent

active

054324831

ABSTRACT:
An integrated circuit of a quadrature modulator comprising a baseband section implementing .pi./4 shift QPSK having a simple test circuit is disclosed. The baseband section comprises: an impulse response memory having memory cells each storing a cell data representing a value of impulse response sequence for a impulse response function; and an adder for convolution integral implementing convolution summer from the cell data. The quadrature modulator operates for testing the cell data of the memory cells of the impulse response memory when supplied with a test instruction signal. The test is carried out by reading out whole the memory cells of the impulse response memory and adding in the adder for convolution integral the cell data read out from whole the memory cells. The number of I/O terminals for carrying out the test for the impulse response memory and the chip size of the integrated circuit are reduced.

REFERENCES:
patent: 4764940 (1988-08-01), Paneth et al.
Suzuki et al., "Design of Quadrature Modulator for Digital FM Signaling with Digital Signal Processing," Electronics and Communications in Japan, vol. 65-B, No. 9, Sep. 1982, pp. 66-73.
Patent Abstracts of Japan, vol. 9, No. 37, p. 335, Feb. 16, 1985 (JP-A-59 177 799).
Orbit Patent Abstracts of Japan , vol. 9, No. 285, Nov. 12, 1985 (JP-A-60 124 100).
Suzuki et al., "Digital Implementation of Orthogonal Modulator for FM", Shingaku Review CS79-250, pp. 31-36, (date unknown).

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