Oscillation device and communication system
A technology of oscillation device and oscillation frequency, which is applied in the direction of transmission system, synchronization device, digital transmission system, etc.
Inactive Publication Date: 2014-12-03
NIHON DEMPA KOGYO CO LTD
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This phase-locked loop circuit outputs an internal clock. The internal clock is given a phase difference with respect to an external clock signal by using a delay circuit, and further divided and multiplied by a frequency divider and a multiplier. However, Citation 1 does not There are records concerning the phase stability of the internal clock signal before and after the interruption of the external clock signal or power-on
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[0043] First, in order to understand the characteristics of the present invention, the configuration of a conventional phase-locked loop circuit for external synchronization will be described. figure 1 The phase-locked loop circuit shown in the block diagram of , will use the constant temperature bath as the voltage control oscillation part to control the crystal oscillator (crystal oscillator with constant temperature bath; Oven-Controlled Crystal Oscillator, OCXO) 1 The rectangular wave that oscillates is the oscillation frequency The signal (frequency f1 = 40 MHz) is divided by 1 / 4 (frequency division ratio N = 4) by the frequency divider 5 (frequency division unit). Then, phase comparison is performed between the frequency-divided oscillation frequency signal and the reference frequency signal (frequency f2 = 10 MHz) which is a rectangular wave input from outside by a phase comparator 3 (phase comparison unit). Here, 71 in the figure is an input terminal for a reference f...
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An oscillation device includes a voltage control oscillation unit, a dividing unit, an output phase comparison unit, and a control voltage supply unit. The voltage control oscillation unit is configured to oscillate an oscillation frequency signal with a frequency f1 according to a control voltage. The dividing unit is configured to divide the frequency of the oscillation frequency signal into 1 / N (N is a natural number) to match with a frequency f2 of a reference frequency signal input from outside. The output phase comparison unit is configured to compare a phase of the divided oscillation frequency signal with a phase of the reference frequency signal and output a signal according to a phase difference. The control voltage supply unit is configured to generate a control voltage according to the signal according to the phase difference and supply the control voltage to the voltage control oscillation unit.
Description
technical field [0001] The present invention relates to a technique for adjusting the phase of a frequency signal output from an oscillation device having a phase locked loop (Phase Locked Loop, PLL) circuit. Background technique [0002] A frequency synthesizer installed in a base station of a mobile communication or digital terrestrial broadcast (digital terrestrial broadcast) includes an oscillator including a phase-locked loop circuit for external synchronization. The phase-locked loop circuit for external synchronization is directed to a digital phase-locked loop at a subsequent stage of a voltage-controlled crystal oscillator (Voltage-Controlled Crystal Oscillator, VCXO), and outputs a frequency having a frequency identical to a reference frequency signal acquired from the outside. Signal. [0003] The reference frequency signal supplied by distributing a frequency signal oscillated by a standard oscillator such as a cesium frequency standard oscillator or a rubidium ...
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IPC IPC(8): H03L7/099H03L7/18
CPCH04L7/0331H03L7/00H03L1/028H03L7/18
Inventor 土屋昇一
Owner NIHON DEMPA KOGYO CO LTD