Patent ID: 6081164
Filing Date: 2000-06-27
Classification: G06F,H01L,H03J,H03L

Abstract:
A PLL oscillator comprising a piezoelectric resonator, an oscillating circuit for generating an oscillating signal in cooperation with said piezoelectric resonator, a phase locked loop circuit which operates using the oscillating signal generated by said oscillating circuit as a reference signal, and an output circuit for outputting the signal generated by said phase locked loop circuit, said piezoelectric resonator, said oscillating circuit, said phase locked loop circuit, and said output circuit being housed in a package, a frequency of an output signal of said PLL oscillator being determined by an oscillation frequency of said oscillating circuit and a frequency dividing ratio of a programmable frequency divider in said phase locked loop circuit,said PLL oscillator further comprising means for selecting the frequency dividing ratio of said programmable frequency divider so that said output frequency is set to a desired value, and means for stopping an operation of said oscillating circuit and/or switching said output circuit into a high-impedance state,said oscillating circuit, said phase locked loop circuit, and said output circuit being, included in an IC, a control pad for stopping the operation of said oscillating circuit and a control pad for switching said output circuit into a high-impedance state being, disposed oil said IC, and at least one of said two control pads being connected via a bonded-wire to one lead terminal having a portion extending outside said package.