Patent ID: 8076980

Claim:
A temperature-compensated ring oscillator, comprising: a control signal generator configured to generate at least one control signal, the control signal generator comprising: at least one first resistor having a first end which receives a reference voltage and a second end; and at least one second resistor having a third end coupled to the second end of the first resistor, wherein the control signal is extracted from the third end of the second resistor, the first resistor and the second resistor respectively having a first temperature coefficient and a second temperature coefficient, wherein the first temperature coefficient is negative, and the second temperature coefficient is positive; and a voltage controlled oscillator receiving the control signal from the third end of the second resistor and outputting an oscillation signal, the voltage controlled oscillator having (2k+1) cascaded inverter units, where k≧1, each of the inverter units comprising: a first transistor having a drain coupled to a first supply voltage and a gate to receive the control signal; a second transistor having a source to receive a second supply voltage and a gate to receive the control signal; and an inverter coupled between the first transistor and the second transistor, wherein an output port of the j th inverter is connected to an input port of the (j+1) th inverter, where j is an integer from 1 to 2k, and an output port of the (2k+1) th inverter is connected to an input port of the 1 st inverter.