Symmetrized voltage controlled oscillator system

A voltage-controlled oscillator, symmetric technology, applied in power oscillators, automatic power control, discontinuous tuning of frequency band selection, etc. question

Active Publication Date: 2009-02-11
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, the traditional symmetric VCO system requires a large die size, has low linearity, and has no signal modulation capabil...

Method used

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  • Symmetrized voltage controlled oscillator system
  • Symmetrized voltage controlled oscillator system
  • Symmetrized voltage controlled oscillator system

Examples

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Embodiment Construction

[0055] The following is a detailed description of the improved symmetrical voltage-controlled oscillator system circuit according to different embodiments of the present invention. Different embodiments illustrate how different capacitances and inductances are adjusted, so that the overall capacitance and inductance of the symmetrical voltage-controlled oscillator system are tuned, and transmitted in a frequency band at a selected frequency or when the output is modulated One output.

[0056] figure 1 Shows a traditional LC slot type symmetry voltage controlled oscillator system circuit. A circuit 100 includes two variable capacitors 102, two inductors 104, two NMOS MOSFET structures 106 that are alternately coupled, and a constant current power supply 108. The NMOS interactively coupled MOSFET structure 106 provides the necessary negative resistance to eliminate the loss of the resonator. According to Barkhaussen's law, oscillation occurs when the loop gain is greater than one ...

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Abstract

A VCO system embodying the features of the present invention includes a frequency tuning circuit, a modulation circuit coupled in a parallel fashion with the frequency tuning circuit, a band tuning circuit coupled with the frequency tuning circuit in a parallel fashion having at least one switching circuit, a core circuit coupled with the frequency tuning circuit, the modulation circuit, and the band tuning circuit, wherein upon asserting a switching signal and upon adjusting a frequency turning signal, a frequency tuning bias signal, and a band tuning signal, the switching circuit is enabled for configuring the band tuning circuit to join the frequency tuning circuit for adjusting a predetermined output frequency based on a total inductance and a total capacitance provided by the core circuit, the frequency tuning circuit, the modulation circuit and the band tuning circuit.

Description

Technical field [0001] The invention relates to a symmetrical voltage-controlled oscillator system, in particular to an improved integrated design of an inductor-capacitance tank type (tank) symmetrical voltage-controlled oscillator system. Background technique [0002] The popularity of mobile phones has made wireless architecture and circuit technology highly valued. In addition, the miniaturization of complementary metal oxide semiconductor (CMOS) technology in recent years has caused the radio frequency (RF) characteristics of MOS components to greatly improve. The design of single crystal transceivers has been implemented with low-cost CMOS technology, which is an example of the improvement of CMOS RF technology. RF CMOS integrated circuit (IC) technology has advanced to the point where it can be used commercially. [0003] A key component of a wireless communication transceiver is a voltage controlled oscillator. The voltage controlled oscillator is a part of a frequency sy...

Claims

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Application Information

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IPC IPC(8): H03B5/08H03B5/12H03L7/099H03B1/04
CPCH03B5/1243H03B5/1228H03L2207/06H03B2201/0266H03J5/244H03B5/1215H03L7/10H03C3/0958H03B5/1265H03L7/099H03B5/1212
Inventor 施博议何志龙宋大伟
Owner VIA TECH INC
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