Patent ID: 9692425
Date: 2017-06-27
CPC Classifications: H03L

Claim:
1. An oscillator comprising: a control voltage generator that generates a control voltage between a first reference voltage and a second reference voltage with a digital signal; and a voltage controlled oscillation circuit that outputs a signal at a frequency in response to the control voltage, wherein the control voltage generator includes an operational amplifier and a first D/A conversion circuit of resistor voltage-dividing type that generates a voltage between the first reference voltage and the second reference voltage, and the first D/A conversion circuit includes a plurality of resistors coupled to the first reference voltage and the second reference voltage and includes a plurality of switches that have a first end coupled to the operational amplifier, and a second end of a given switch is coupled to a respective resistor from the plurality of resistors and the given switch is operable to electrically couple the respective resistor to the operational amplifier.