Patent ID: 7880553
Filing Date: 2011-02-01
Classification: H03B,H03L

Abstract:
1. An oscillation circuit, comprising: an oscillation section for which an output frequency is controlled based on a control signal depending on an ambient temperature; a temperature compensation circuit for supplying the control signal to this oscillation section; and a switching switch circuit consisting of an oscillation output switch and a temperature sensor output switch for which ON and OFF are controlled so that any one of an oscillation output from the oscillation section and a temperature sensor output from the temperature compensation circuit is selectively outputted, wherein the temperature sensor output switch is structured so that transfer gate switches are connected in a two-stage serial manner and a third switch connected to a fixed potential is sandwiched between these connection points, and the switching switch circuit is configured so that, when the oscillation output switch is ON, the respective transfer gate switches of the temperature sensor output switch are OFF and the third switch is ON and, when the oscillation output switch is OFF, the respective transfer gate switches of the temperature sensor output switch are ON and the third switch is OFF.