Self-biased active VCO level shifter
AssigneeMarvell International Ltd.
InventorSwee-Ann Teo
Life of this patent
Estimating the term…
Abstract
A voltage-controlled oscillator (VCO) circuit includes first, second, third, and fourth transistors, wherein said third and fourth transistors bias the second and first transistors, respectively. First and second capacitances communicate with the first, second, third, and fourth transistors. A first input receives a first capacitance adjustment signal. At least one second input receives a second capacitance adjustment signal. The first capacitance has a first end connected to he first input and the third transistor. The second capacitance has a first end connected to the second input and the fourth transistor.
Claims26
A voltage-controlled oscillator (VCO) circuit, comprising:
- first, second, third, and fourth transistors, wherein said third and fourth transistors bias said second and first transistors, respectively;
- first and second capacitances that communicate with said first, second, third, and fourth transistors,
- a first input that receives a first capacitance adjustment signal;
- and
- at least one second input that receives a second capacitance adjustment signal,
- wherein said first capacitance has a first end connected to said first input and said third transistor, and
- wherein said second capacitance has a first end connected to said second input and said fourth transistor.
A phase-locked loop (PLL) circuit comprising:
- a voltage-controlled oscillator (VCO) circuit that includes:
- first, second, third, and fourth transistors, wherein said third and fourth transistors bias said second and first transistors, respectively;
- first and second capacitances that communicate with said first, second, third, and fourth transistors,
- a first input that receives a first capacitance adjustment signal;
- and
- at least one second input that receives a second capacitance adjustment signal;
- and
- a charge pump that generates said first capacitance adjustment signal.
A voltage-controlled oscillator (VCO) circuit, comprising:
- first, second, third, and fourth transistors, wherein said third and fourth transistors bias said second and first transistors, respectively, and each of said first, second, third, and fourth transistors includes a first terminal, a second terminal, and a control terminal;
- first and second capacitances that communicate with said first, second, third, and fourth transistors,
- a first input that receives a first capacitance adjustment signal;
- at least one second input that receives a second capacitance adjustment signal;
- and
- first and second inductances, wherein first ends of said first and second inductances communicate with said control terminals of said third and fourth transistors.
A voltage-controlled oscillator (VCO) circuit, comprising:
- first, second, third, and fourth switching means for selectively conducting current, wherein said third and fourth switching means bias said second and first switching means, respectively;
- first and second capacitance means for providing a capacitance and for communicating with said first, second, third, and fourth switching means,
- a first input that receives a first capacitance adjustment signal;
- and
- at least one second input that receives a second capacitance adjustment signal,
- wherein said first capacitance means has a first end connected to said first input and said third switching means, and
- wherein said second capacitance means has a first end connected to said second input and said fourth switching means.
A phase-locked loop (PLL) circuit comprising:
- a voltage-controlled oscillator (VCO) circuit that includes:
- first, second, third, and fourth switching means for selectively conducting current, wherein said third and fourth switching means bias said second and first switching means, respectively;
- first and second capacitance means for providing a capacitance and for communicating with said first, second, third, and fourth switching means;
- a first input that receives a first capacitance adjustment signal;
- and
- at least one second input that receives a second capacitance adjustment signal;
- and
- charge pump means for generating said first capacitance adjustment signal.
A voltage-controlled oscillator (VCO) circuit comprising:
- first, second, third, and fourth switching means for selectively conducting current, wherein said third and fourth switching means bias said second and first switching means, respectively;
- first and second capacitance means for providing a capacitance and for communicating with said first, second, third, and fourth switching means;
- a first input that receives a first capacitance adjustment signal;
- at least one second input that receives a second capacitance adjustment signal;
- and
- first and second inductance means for providing an inductance, wherein first ends of said first and second inductance means communicate with said control terminals of said third and fourth switching means.
Dependencies are inferred from the claim text.