Patent ID: 9407270
Filing Date: 2016-08-02
CPC Classification: H03L

Claim Text:
1. An integrated circuit comprising: a plurality of first transistor circuits fixedly coupled to an input voltage; a plurality of second transistor circuits switchably coupled to the input voltage; and an output electrically coupled to the plurality of second transistor circuits and the plurality of first transistor circuits to convey an output signal having a frequency dependent on which of the second transistor circuits are enabled, an increase in the frequency of the output signal due to enabling of a selected one of the second transistor circuits being proportional to a width of transistors in the selected one of the second transistor circuits a current mirror circuit connected between power supply terminals of the integrated circuit; a voltage divider connected between the power supply terminals; and an operational amplifier configured to provide a predetermined current to the plurality of first transistor circuits fixedly coupled to the input voltage in order to set a base frequency of the output signal, wherein the operational amplifier samples a voltage of the current mirror circuit and a voltage at a midpoint of the voltage divider in order to provide the predetermined current to the plurality of first transistor circuits.