Current reference generator and associated method

A circuit to provide a reference current to a device having a first current controlled oscillator (CCO), the circuit comprising:

• a reference circuit providing an input voltage or an input current based on a reference frequency;
• and
• a feedback loop circuit comprising:
• a differential circuit having a first input that receives the input voltage or the input current from the reference circuit and provides an output current;
• a second CCO that receives the output current from the differential circuit and produces an output frequency in response, the second CCO adapted to have substantially matching performance to the first CCO;
• a divider circuit to divide the output frequency into a feedback frequency;
• and
• a feedback switched capacitor resistor circuit providing a feedback voltage or a feedback current to a second input of the differential circuit based on the feedback frequency;
• wherein the differential circuit adjusts its output current based on a difference between the input voltage and the feedback voltage or between the input current and the feedback current;
• wherein the differential circuit is adapted to provide the output current to the device having the first CCO as the reference current;
• and
• wherein the feedback frequency is adapted to be substantially equal to a divided version of an output frequency of the device having the first CCO due to the second CCO having substantially matching performance to the first CCO.