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Double frequency voltage controlled oscillator with phase noise improved

An oscillator and frequency band technology, applied in the field of phase noise reduction, can solve complex and other problems

Inactive Publication Date: 2004-10-27
GOOGLE TECHNOLOGY HOLDINGS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As will be apparent to those skilled in the art, using a dual-band VCO to generate the signals required to modulate and transmit a baseband signal, or to demodulate and detect that baseband signal, is more efficient than using, for example, separate VCOs to generate the same four-band VCO. more complex
The challenge that arises when using a switchable dual-band VCO is obtaining the best phase noise performance at each selected frequency band

Method used

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  • Double frequency voltage controlled oscillator with phase noise improved
  • Double frequency voltage controlled oscillator with phase noise improved
  • Double frequency voltage controlled oscillator with phase noise improved

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Embodiment Construction

[0014] In accordance with the principles of the invention, the disclosure of the invention is disclosed with reference to preferred embodiments as follows.

[0015] Referring to FIG. 1 , a prior art VCO is generally indicated by numeral 10 . The dual band VCO is switched between the dual output signal frequencies at output 15 by applying a band changing signal at terminal 16 to switch 14 as shown in the prior art. The frequency of the output signal of the active element 11 is varied by selectively connecting the switch 14 to or disconnecting the resonant elements 12, 13, as known to those skilled in the art. Biasing for the active element 11 is provided via a resistive network 17 comprising resistors R1, R2.

[0016] exist figure 2 The invention according to the inventive principles is shown in , using the same reference numerals as in FIG. 1 for the same parts. figure 2 The VCO shown in is typically denoted by 20. Although a dual band VCO is shown with reference to the ...

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Abstract

A dual band VCO selects between the oscillator output frequencies by switching the resonant circuit elements in the active circuit. For each output frequency selected, the oscillator produces a single frequency signal and additional energy in the form of phase noise. This phase noise may be from sideband noise produced by modulation of the single frequency or produced by the active device in the oscillator as flicker noise, or the noise figure of the active device under large signal conditions or the filtering effect or the resonant circuit. Phase noise is reduced by shifting the bias point for the active device to the level where phase noise is minimum for each output frequency. At the time the output frequency is selectively switched, the bias to the active device is selectively switched to an optimum bias level for minimum phase noise for each respective selected frequency.

Description

technical field [0001] The present invention relates to voltage controlled oscillators (VCOs), and more particularly to the reduction of phase noise in the frequency spectrum located around the VCO signal frequency. Background technique [0002] As is known in the art, a dual-band VCO selects between oscillator output frequencies by switching resonant circuit elements in the active circuit. For each selected output frequency, the oscillator produces a signal frequency signal plus additional energy in the form of phase noise. This additional sideband noise generated by the modulation of the signal frequency is generated by the active elements in the oscillator as flicker noise, or by the noise figure of the active elements and filtering effects or resonant circuits under large signal conditions of. Achieving good phase noise performance in each switching band with separate VCOs has the drawbacks of requiring more components, weight, and cost. As is well known and understoo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/12
CPCH03B5/1243H03B5/1203H03B5/1231H03B1/00
Inventor 古斯塔沃·雷泽罗维奇比德·J·叶赫
Owner GOOGLE TECHNOLOGY HOLDINGS LLC