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Voltage controlled oscillator using variable capacitor and phase locked loop using the same

a voltage control and capacitor technology, applied in pulse generators, pulse techniques, instruments, etc., can solve the problems of deteriorating phase noise characteristics very much, and achieve the effect of effective frequency control

Inactive Publication Date: 2013-08-01
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about improving the control of an electronic circuit called a Voltage Controlled Oscillator (VCO). The invention uses a method where a capacitor bank is used to change the frequency of the VCO. This change is proportional to the amount of electric current provided to the VCO. By controlling this electric current, the invention allows for better linear control over the frequency of the VCO. This results in improved efficiency and accuracy in the control of the frequency of the electronic signal.

Problems solved by technology

However, when a capacitor band becomes 16 bits, a phase noise characteristic is deteriorated very much by parasitic capacitance by a switch device.

Method used

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  • Voltage controlled oscillator using variable capacitor and phase locked loop using the same
  • Voltage controlled oscillator using variable capacitor and phase locked loop using the same
  • Voltage controlled oscillator using variable capacitor and phase locked loop using the same

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Embodiment Construction

[0028]The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0029]The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodime...

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Abstract

A variable capacitor is provided. The variable capacitor includes a plurality of capacitor segments. The plurality of capacitor segments are connected in parallel within the variable capacitor. When a plurality of candidate capacitances allowable to the variable capacitor according to a connection state of the plurality of capacitor segments connected in parallel are sorted in a magnitude sequence, the plurality of candidate capacitances form a geometric series. The variable capacitor is used for a Voltage Controlled Oscillator (VCO), and the VCO is used for a Phase Locked Loop (PLL).

Description

PRIORITY[0001]This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on Jan. 30, 2012 in the Korean Intellectual Property Office and assigned Serial No. 10-2012-0008866, the entire disclosure of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a Voltage Controlled Oscillator (VCO). More particularly, the present invention relates to a VCO for determining an output frequency by controlling a capacitor value in a cardinal manner.[0004]2. Description of the Related Art[0005]A VCO is a device for outputting a frequency that depends on an externally applied voltage. The VCO is primarily used for an analog sound synthesis apparatus, a mobile communication terminal, and the like. The VCO used for a sound synthesis apparatus generates a sine wave, a sawtooth wave, a pulse wave, a square wave, a triangle wave, and the like to generate a basic sound. The VCO is u...

Claims

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Application Information

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IPC IPC(8): H03L7/099H03B5/12H01G15/00
CPCH03L7/099H01G15/00H03B5/1265H03B5/1228H03B5/1215H03B5/08
Inventor LEE, JONG-WOO
Owner SAMSUNG ELECTRONICS CO LTD