Wide frequency range voltage controlled oscillators
AssigneeXilinx, Inc.
InventorsAdebabay M. Bekele, Parag Upadhyaya
Life of this patent
Estimating the term…
Abstract
Transformer based voltage controlled oscillator circuitry for phase-locked loop circuitry includes upper band circuitry and lower band circuitry. The upper band circuitry operates in a first frequency range and includes a first capacitor array having a variable capacitance. The lower band circuitry operates in a second frequency range and includes a second capacitor array having a variable capacitance. The first frequency range higher than the second frequency range. In a first operating mode, the first capacitor array has a first capacitance value and the second capacitor array has a second capacitance value. In a second operating mode, the second capacitor array has a third capacitance value different than the second capacitance value.
Claims18
A transformer based voltage controlled oscillator (VCO) circuitry comprising:
- upper band circuitry configured to operate in a first frequency range and comprising a first capacitor array having a variable capacitance;
- and
- lower band circuitry configured to operate in a second frequency range and comprising a second capacitor array having a variable capacitance, the first frequency range higher than the second frequency range, wherein:
- in a first operating mode, the first capacitor array has a first capacitance value and the second capacitor array has a second capacitance value;
- and
- in a second operating mode, the second capacitor array has a third capacitance value, wherein the third capacitance value is less than the second capacitance value.
A phase-locked loop (PLL) circuitry comprising:
- transformer based voltage control oscillator (VCO) circuitry comprising:
- upper band circuitry configured to operate in a first frequency range and comprising a first capacitor array having a variable capacitance;
- and
- lower band circuitry configured to operate in a second frequency range and comprising a second capacitor array having a variable capacitance, the first frequency range higher than the second frequency range, wherein:
- in a first operating mode, the first capacitor array has a first capacitance value and the second capacitor array has a second capacitance value;
- and
- in a second operating mode, the second capacitor array has a third capacitance value, wherein the third capacitance value is less than the second capacitance value.
A method comprising:
- generating, in a first mode, a second control signal based on a first control signal and an offset value;
- adjusting, in the first mode, a capacitance value of a first capacitor array of upper band circuitry based on the first control signal;
- adjusting, in the first mode, a capacitance value of a second capacitor array of a lower band circuitry based on the second control signal;
- generating, in a second mode, a third control signal, the third control signal different than the second control signal;
- adjusting, in the second mode, the capacitance value of the first capacitor array of the upper band circuitry based on the first control signal;
- and
- adjusting, in the second mode, the capacitance value of the second capacitor array of the lower band circuitry based on the third control signal.
Dependencies are inferred from the claim text.