Transmitting circuit for use in code-division multiple access sy

Details Transmitting circuit for use in code-division multiple access sy Transmitting circuit for use in code-division multiple access sy

1999-06-17

2000-12-26

Vo, Don N.

Pulse or digital communications

Transmitters

Angle modulation

375302, 375376, H04L 2720

Patent

active

061670960

ABSTRACT:
A transmitting circuit comprises a QPSK modulator, a voltage controlled oscillator used as a frequency modulator, and a PLL circuit for controlling the oscillation frequency of the voltage controlled oscillator. The frequency of a reference signal supplied to the PLL circuit is used as a first reference frequency in the event of performing the QPSK modulation by the QPSK modulator and is used as a second reference frequency lower than the first reference frequency in the event of performing the frequency modulation by the voltage controlled oscillator.

REFERENCES:
patent: 5434887 (1995-07-01), Osaka

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