Systems and Methods for Wideband CMOS Voltage-Controlled Oscillators Using Reconfigurable Inductor Arrays
First Claim
1. A reconfigurable network for a voltage-controlled oscillator, comprising:
- a plurality of capacitors, wherein a respective capacitance of at least a portion of the plurality of capacitors is adjustable, wherein the plurality of capacitors are connected between a first port and a second port;
a plurality of inductors; and
a plurality of switches for selecting one or more of the plurality of inductors, wherein the selected ones of the inductors are connected between the first port and the second port based upon the configuration of the plurality of switches,wherein the plurality of capacitors, inductors, and switches collectively form a resonance LC tank circuit having the first port and the second port.
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Abstract
As wireless communication technology evolves, various transceivers become integrated into a single system, which implements a seamless connection to search available frequency bands and to provide wireless connections regardless of their wireless standards. One of the key technologies for seamless implementation is an ultra-wideband local oscillator, which can overcome the restriction of limited tuning range in typical RF local oscillators. Many RF oscillators incorporate LC-tuned oscillators because of their good noise performance while their tuning range is limited by fixed inductance and varied capacitance. The planar inductor fabricated on the CMOS process occupies a large area as well. By replacing the planar inductor with the array of bondwires, and including switches to provide proper impedance for the circuit to generate negative impedance, the tuning range of a CMOS voltage-controlled oscillator (VCO) is extended more than 100%, which number can not be achieved in a convention VCO.
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Citations
20 Claims
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1. A reconfigurable network for a voltage-controlled oscillator, comprising:
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a plurality of capacitors, wherein a respective capacitance of at least a portion of the plurality of capacitors is adjustable, wherein the plurality of capacitors are connected between a first port and a second port; a plurality of inductors; and a plurality of switches for selecting one or more of the plurality of inductors, wherein the selected ones of the inductors are connected between the first port and the second port based upon the configuration of the plurality of switches, wherein the plurality of capacitors, inductors, and switches collectively form a resonance LC tank circuit having the first port and the second port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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providing a plurality of capacitors, wherein a respective capacitance of at least a portion of the plurality of capacitors is adjustable, wherein the plurality of capacitors are connected between a first port and a second port; providing a plurality of inductors; and configuring a plurality of switches for selecting one or more of the plurality of inductors, wherein the selected ones of the inductors are connected between the first port and the second port based upon the configuration of the plurality of switches, wherein the plurality of capacitors, inductors, and switches collectively form a resonance LC tank circuit having the first port and the second port. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification