Patent ID: 7154352

Claim:
A clock generator comprising: a current controlled oscillator (ICO) having an input for receiving a control current, and an output for outputting clock signals of a frequency according to the control current; and a biasing circuit electrically connected to the ICO comprising: a controlled current generator having a first current output coupled to the input of the ICO for outputting the control current, and a second current output copying the first current output with a predetermined ratio; a resistor having one end coupled to the second current output of the controlled current generator; an operational amplifier (opamp) having a first input coupled to the second current output of the controlled current generator, a second input, and an output coupled to the controlled current generator; a diode having an end coupled to the second input of the opamp; and a current source having a first end coupled to the end of the diode and a second end coupled to the output of the opamp, wherein substantially all of the current from the current source flows through the diode and substantially all of the current from second current output flows through the resistor.