OSCILLATOR CIRCUIT WITH OUTPUT SLOPE PROPORTIONAL TO SUPPLY VOLTAGE

摘要

A voltage-controlled oscillator (VCO) comprises a supply voltage node, configured to receive a supply voltage, a VCO output capacitor, configured to provide an oscillating output voltage across the capacitor, a discharge switch configured to discharge the capacitor according to an oscillation frequency of the oscillating output voltage, and a comparator circuit configured to provide, to a control terminal of the discharge switch, a control signal that is determined based on a comparison of the output voltage and a specified threshold voltage. The oscillating output voltage includes a pulse having a ramp slope that is determined as a function of a magnitude of the supply voltage, and is capable of being adjusted independently of the oscillation frequency.

主权项

1. An apparatus, comprising:
a voltage-controlled oscillator (VCO), comprising:
a supply voltage node, configured to receive a supply voltage;a VCO output capacitor, configured to provide an oscillating output voltage across the capacitor;a discharge switch, coupled in parallel with the capacitor, the discharge switch configured to discharge the capacitor according to an oscillation frequency of the oscillating output voltage; anda first comparator circuit, configured to provide, to a control terminal of the discharge switch, a control signal that is determined based on a comparison of the output voltage and a specified threshold voltage;wherein the oscillating output voltage includes a ramp pulse having a ramp slope that is determined as a function of a magnitude of the supply voltage and that is capable of being adjusted independently of the oscillation frequency.