Title: PLL transient response control system and communication system
Application Number: 200610136695 Application Date: 2006.10.31
Publication Number: 1960185 Publication Date: 2007.05.09
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03L7/16;H03L7/183
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Yokota Tetsuro;Yamaguchi Satoshi;Kataoka Shigeru
Attorney & Agent: huangjian feng
Abstract:
    The present invention includes two lines of PLL circuits. The first PLL circuit 31 includes a first voltage-controlled oscillator 34 that increases in oscillation frequency as a control voltage increases. The second PLL circuit 41 includes a second voltage-controlled oscillator 44 that decreases in oscillation frequency as a control voltage increases. A feedback voltage applied to the first voltage-controlled oscillator 34 is added to a feedback voltage applied to the second voltage controlled oscillator 44. The output signals of the two voltage-controlled oscillators 34, 44 are synthesized by a mixer 13, so that the transient responses of the first PLL circuit 31 and the second PLL circuit 41 cancel each other out. Thus, the transient response of the output signal of the mixer 13 becomes shorter.
Time: 10
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