Multi-band LC resonance voltage-controlled oscillator with adjustable negative resistance cell
First Claim
1. An LC resonance voltage-controlled oscillator comprising:
- an inductor providing an inductance element partially determining the frequency of an oscillation wave;
a discrete capacitor bank providing a capacitance element partially determining the frequency of the oscillation wave and being discretely determined by a control bit signal; and
a discrete negative resistance cell providing a negative resistance element that is discretely determined by the control bit signal, to keep the amplitude of the oscillation wave constant,wherein the respective control bit signal determined to discretely turn on the respective capacitance element corresponds to the respective control bit signal to discretely turn on the negative resistive element irrespective of the frequency of the oscillation wave.
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Accused Products
Abstract
Provided is an LC resonance voltage-controlled oscillator (VCO) used for a multi-band multi-mode wireless transceiver. In order to generate a multi-band frequency, a capacitor bank and a switchable inductor are included in the LC resonance voltage-controlled oscillator. The LC resonance voltage-controlled oscillator employs an adjustable emitter-degeneration negative resistance cell in place of tail current sources in order to compensate for non-uniform oscillation amplitude caused by the capacitor bank and prevent the degradation of a phase noise due to the tail current sources. The LC resonance voltage-controlled oscillator includes an inductor providing an inductance element partially determining the frequency of an oscillation wave; a discrete capacitor bank providing a capacitance element partially determining the frequency of the oscillation wave and being discretely determined by a control bit signal; and a discrete negative resistance cell providing a negative resistance element that is discretely determined by the control bit signal, to keep the amplitude of the oscillation wave constant.
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Citations
9 Claims
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1. An LC resonance voltage-controlled oscillator comprising:
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an inductor providing an inductance element partially determining the frequency of an oscillation wave; a discrete capacitor bank providing a capacitance element partially determining the frequency of the oscillation wave and being discretely determined by a control bit signal; and a discrete negative resistance cell providing a negative resistance element that is discretely determined by the control bit signal, to keep the amplitude of the oscillation wave constant, wherein the respective control bit signal determined to discretely turn on the respective capacitance element corresponds to the respective control bit signal to discretely turn on the negative resistive element irrespective of the frequency of the oscillation wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification