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Invention Grant
US07936225B2 Voltage controlled oscillator circuit, phase-locked loop circuit using the voltage controlled oscillator circuit, and semiconductor device provided with the same 有权
压控振荡电路，采用压控振荡电路的锁相环电路，以及配有该控制振荡电路的半导体装置

Voltage controlled oscillator circuit, phase-locked loop circuit using the voltage controlled oscillator circuit, and semiconductor device provided with the same
Abstract:
A VCO circuit includes: a control portion to which a first voltage is inputted and from which a second voltage corresponding to the first voltage is outputted; a current source portion to which the second voltage is inputted and from which a current corresponding to the second voltage is outputted; and an oscillator circuit to which the current is inputted and from which a signal with a frequency in accordance with the current is outputted. The control portion includes an adjusting circuit which changes the second voltage in conjunction with fluctuation of a power supply voltage. Accordingly, fluctuation of the frequency Fo of an output signal of the VCO circuit can be suppressed even when the power supply voltage of the VCO circuit fluctuates.
Abstract(Chinese):

VCO电路包括：输入第一电压并从其输出与第一电压对应的第二电压的控制部分; 输入第二电压的电流源部，并输出与第二电压对应的电流; 以及输入电流的振荡器电路，并且从该振荡器电路输出具有与电流相关的频率的信号。 控制部分包括调整电路，其随着电源电压的波动而改变第二电压。 因此，即使当VCO电路的电源电压波动时也可以抑制VCO电路的输出信号的频率Fo的波动。

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