Patent Number: 6,167,096

Title: Transmitting circuit for use in code-division multiple access system and frequency-division multiple access system

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.

Inventors: Kikuchi; Jiro (Fukushima-ken, JP)

Assignee: Alps Electric Co., Ltd.

International Classification: H03C 3/00 (20060101); H03C 3/09 (20060101); H04L 27/20 (20060101); H03L 7/16 (20060101); H03L 7/18 (20060101); H04L 027/20 ()

Expiration Date: 12/26/2017