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Method and device for injection locking of voltage controlled oscillators using direct digital tuning

A technology of voltage-controlled oscillator and injection locking, which is applied in the field of electronics and can solve problems such as large injection signal power

Inactive Publication Date: 2005-09-28
KLEER SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, obtaining this LBW usually requires a large injected signal power, which is undesirable in certain applications such as integrated (vs. discrete) circuits

Method used

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  • Method and device for injection locking of voltage controlled oscillators using direct digital tuning
  • Method and device for injection locking of voltage controlled oscillators using direct digital tuning
  • Method and device for injection locking of voltage controlled oscillators using direct digital tuning

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Embodiment Construction

[0021] The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will provide those skilled in the art fully expresses the scope of the invention. The drawings and the following description refer to preferred embodiments but are not limited thereto.

[0022] The present invention enables the signal processing capability of digital circuits (such as widely used in wireless transceiver circuits) to be used to determine the oscillation frequency of the VCO without the need for extensive additional circuits.

[0023] Such as figure 2 As shown, tuning of the VCO 30 is implemented in the digital domain, comprising three main components: an analog-to-digital converter (ADC) 38, a digital microcontroller 42, and a digital-to-analog converter (DAC). From the start, the reference signal 32, which is typically...

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PUM

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Abstract

The invention relates to the field of electronics and more particularly to the tuning and injection locking of voltage controlled oscillators (VCOs). An improved injection locking circuit is provided which allows the VCO to injection lock with a smaller reference signal and therefore a smaller locking bandwidth (LBW). In order to allow the VCO to injection lock with a lower power reference signal, this invention includes a pre-tuning algorithm to place the VCO frequency such that the desired frequency is in the LBW. Tuning of the VCO is achieved using direct digital tuning that does not require an input reference. Injection locking is performed using a low frequency clock harmonic as the reference signal. More specifically, tuning is accomplished by sub-sampling and digitizing the output signal of the VCO, determining the center frequency, and adjusting the VCO control voltage.

Description

[0001] copyright notice [0002] The disclosed portion of this patent document contains material that is protected by copyright. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but reserves all copyrights whatsoever. technical field [0003] The present invention relates to the field of electronics, and in particular to tuning and injection locking of voltage controlled oscillators (VCOs). Background technique [0004] As will be understood by those skilled in the art, an oscillator is an electronic device used to generate a signal. Oscillators are found in computers, audio equipment (especially music synthesizers), wireless receivers and transmitters. There are many types of oscillator devices, but they all operate on the same basic principle: an oscillator always employs a sense amplifier whose output is fed back in phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12H03L7/24
CPCH03B5/1243H03B5/1228H03B5/1215H03L7/24H03L7/099H03L7/20H03B5/12
Inventor 克里斯多佛·安德鲁·德弗里斯拉尔夫·迪克森·梅森
Owner KLEER SEMICON CORP
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