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Tunable LC oscillator with common mode voltage adjustment

A common-mode voltage and oscillator technology, applied in the field of tunable LC oscillators using common-mode voltage regulation, can solve problems such as phase noise performance degradation

Active Publication Date: 2015-03-04
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a degradation in phase noise performance may often be observed with changes in input power

Method used

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  • Tunable LC oscillator with common mode voltage adjustment
  • Tunable LC oscillator with common mode voltage adjustment
  • Tunable LC oscillator with common mode voltage adjustment

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Embodiment Construction

[0008] A more detailed description of the present invention is given below. Those skilled in the art will appreciate that the following detailed description is illustrative only and is not intended to be limiting in any way. Other embodiments of the invention will readily occur to those skilled in the art having the benefit of this disclosure. Reference will now be made in detail to the embodiments of the invention illustrated in the accompanying drawings. The same reference designators will be used throughout the drawings and the following detailed description to refer to the same or like parts.

[0009] refer to figure 1 , showing a diagram of an LC oscillator with improved phase noise performance. The constant current source I is coupled to the supply voltage Vdd and supplies the necessary current to the oscillator to generate oscillation conditions and ensure sufficient oscillation amplitude. Use the control signal CTL I to set the regulated current. Steady current s...

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Abstract

An LC oscillator is provided that achieves improved phase noise performance. A variable frequency oscillator includes a variable supply source, an oscillator tank circuit, a variable capacitance circuit comprising MOS switches, and an oscillator tank voltage common mode adjustment circuit. When the capacitance of the variable capacitance circuit is varied to vary an output frequency of the variable frequency oscillator, the common mode voltage is adjusted to reduce transitions of the MOS switches between an inversion state and a depletion state during excursions of an output signal through one cycle of oscillation.

Description

Background technique [0001] A typical wireless transceiver uses at least one high frequency oscillator to generate a modulated carrier when transmitting or to downconvert an incoming modulated signal when receiving. [0002] For many wireless standards (eg GSM, WCDMA, Bluetooth, WLAN, etc.), the type of oscillator used in radio transceivers is an LC type oscillator. For cost reasons, CMOS has become the process of choice in designing wireless transceivers. Using an LC oscillator makes it possible to achieve acceptable phase noise for many cellular, WPAN and WLAN systems. However, degradation in phase noise performance may often be observed with changes in input power. Contents of the invention [0003] The present invention provides an LC oscillator that achieves improved phase noise performance. The variable frequency oscillator includes a variable power supply, an oscillator energy storage circuit, a variable capacitance circuit including a MOS switch, and an oscillator...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/12
CPCH03B5/1243H03B5/1228H03B2201/038H03B5/1215H03B5/1265H03B5/129H03B5/1253H03B5/1278
Inventor 大卫·迪佩雷
Owner NXP BV