Back to results
US 2026/0221939 A1Published application
Voltage-controlled rc oscillator and method for generating a clock signal
OwnerChinwuba Ezekwe, Mahdi Rajabzadeh +2inventors
InventorsChinwuba Ezekwe, Mahdi Rajabzadeh, Mourad Elsobky, Xinyu Xing
Life of this patent
Estimating the term…
Abstract
A voltage-controlled RC oscillator and a method for generating a clock signal using a voltage-controlled RC oscillator.
Claims14
A voltage-controlled RC oscillator (VCO), comprising:
- an integrator including an integration capacitor;
- a reference resistor configured to generate a reference current;
- a first sampling capacitor configured to sample a reference voltage;
- at least one second sampling capacitor configured to sample an input control voltage;
- a comparator configured to generate an output signal depending on an output voltage of the integrator;
- a clock generator configured to generate clock phase signals depending on the output signal of the comparator, wherein the clock phase signals are used to control the sampling of the reference voltage and of the input control voltage;
- a frequency divider;
- and
- an auxiliary oscillator that is activated when the output of the integrator exceeds a predetermined threshold value for a predetermined time;
- wherein the reference resistor and the first sampling capacitor and the at least one second sampling capacitor are connected in such a way that the VCO is robust against fluctuations in a supply voltage and the reference voltage.
7 more elements
A method for generating a clock signal using a voltage-controlled RC oscillator (VCO), comprising the following steps:
- integrating a reference current, which flows through a reference resistor, using an integrator to generate a sawtooth output voltage;
- sampling a reference voltage using a first sampling capacitor and sampling an input control voltage using at least one second sampling capacitor using clock phase signals;
- comparing the output voltage of the integrator with a threshold value using a comparator;
- generating clock phase signals by a clock generator depending on an output signal of the comparator;
- dividing the clock phase signals generated by the clock generator, using a frequency divider to generate an output clock signal;
- activating an auxiliary oscillator when the output voltage of the integrator exceeds a predetermined threshold value for a predetermined time;
- wherein the method increases the robustness of the VCO against fluctuations in a supply voltage and the reference voltage.
4 more elements
Dependencies are inferred from the claim text.