Single differential-inductor vco with implicit common-mode resonance
AssigneeBroadcom Corporation
InventorsDavid Patrick MURPHY, Hooman DARABI
Life of this patent
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Abstract
A circuit for a single differential-inductor oscillator with common-mode resonance may include a tank circuit formed by coupling a first inductor with a pair of first capacitors; a cross-coupled transistor pair coupled to the tank circuit; and one or more second capacitors coupled to the tank circuit and the cross-coupled transistors. The single differential-inductor oscillator may be configured such that a common mode (CM) resonance frequency (FCM) associated with the single differential-inductor oscillator is at twice a differential resonance frequency (FD) associated with the single differential-inductor oscillator.
Claims20
A circuit for a single differential-inductor oscillator with common-mode resonance, the circuit comprising:
- a tank circuit formed by coupling a first inductor with a pair of first capacitors;
- a cross-coupled transistor pair coupled to the tank circuit;
- and
- one or more second capacitors coupled to the tank circuit and the cross-coupled transistors,
- wherein the single differential-inductor oscillator is configured to allow tuning of a common mode (CM) resonance frequency (FCM) associated with the single differential-inductor oscillator to be at twice a differential resonance frequency (FD) associated with the single differential-inductor oscillator.
A method for providing a single differential-inductor oscillator with common-mode resonance, the method comprising:
- forming a tank circuit by coupling a first inductor with a pair of first capacitors;
- coupling a cross-coupled transistor pair to the tank circuit;
- coupling one or more second capacitors to the tank circuit and the cross-coupled transistors;
- and
- configuring the single differential-inductor oscillator to allow tuning of a common mode (CM) resonance frequency (FCM) associated with the single differential-inductor oscillator to be at twice a differential resonance frequency (FD) associated with the single differential-inductor oscillator.
A communication device comprising:
- a radio-frequency (RF) transceiver comprising one or more local oscillators;
- the one or more local oscillators comprising one or more single differential-inductor voltage-controlled oscillators (VCOs) with common-mode resonances, wherein each single differential-inductor VCO comprises:
- a tank circuit formed by coupling a first inductor with a pair of first capacitors;
- a cross-coupled transistor pair coupled to the tank circuit;
- and
- one or more second capacitors coupled to the tank circuit and the cross-coupled transistors,
- wherein each single differential-inductor VCO is configured to allow tuning of a common mode (CM) resonance frequency (FCM) associated with the single differential-inductor VCO to be at twice a differential resonance frequency (FD) associated with the single differential-inductor VCO.
Dependencies are inferred from the claim text.