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Voltage-controlled oscillator

A technology of voltage-controlled oscillators and transformers, applied to power oscillators, electrical components, etc., to achieve high frequency and increase the oscillation frequency

Active Publication Date: 2011-03-30
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, these problems become the oscillation frequency f OSC The dilemma between tuning frequency range, in high frequency circuit design, such influence will be great

Method used

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Embodiment Construction

[0054] In order to improve the dilemma between the oscillation frequency and the tuning frequency range of the traditional voltage controlled oscillator, the following embodiments do not use variable capacitors, but change the frequency by changing the current on the resonant crystal. figure 2 It is a schematic circuit diagram illustrating a voltage-controlled oscillator according to an embodiment of the present invention. Please refer to figure 2 , the voltage controlled oscillator 200 includes a voltage controlled current source 210 , a negative resistance circuit 220 , a first transformer 230 , a second transformer 240 , a first transistor 250 and a second transistor 260 . In this embodiment, both the transistors 250 and 260 are N-channel metal oxide semiconductor (NMOS) transistors.

[0055] The voltage-controlled current source 210 has a control terminal and a current terminal, wherein the control terminal receives the control voltage Vc. The negative resistance circu...

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Abstract

The invention discloses a voltage-controlled oscillator, which comprises a voltage-controlled current source, a negative resistance circuit, a first transformer, a second transformer, a first transistor and a second transistor. The control end of the voltage-controlled current source receives a control voltage. The first ends of the first and second current paths in the negative resistance circuit are coupled to the current end of the voltage-controlled current source. The primary sides of the first and second transformers are coupled to the second ends of the first and second current paths in the negative resistance circuit respectively. The secondary sides of the first and second transformers are used as the first and second output ends of the voltage-controlled oscillator respectively.The first ends of the first and second transistors are coupled to the secondary sides of the first and second transformers respectively. The control ends of the first and second transistors are coupled to the primary sides of the first and second transformers respectively.

Description

technical field [0001] The present invention relates to an oscillator, and more particularly to a broadband voltage-controlled oscillator using negative resistance technology. Background technique [0002] In recent years, due to the development of wireless communication, the manufacturing technology of integrated circuits has undergone considerable changes in a short period of time, especially the circuits used in radio frequency (RF) receiving and transmitting ends. With the advancement of process technology, the application range of integrated circuits at Giga Hertz (Giga Hertz) frequency is becoming wider and wider, and even tends to be developed at higher operating frequencies, making circuit design at the receiving and transmitting ends more difficult, but Also more challenging. The voltage controlled oscillator (VCO) plays an important role in the front-end RF circuit, and is mainly used in the frequency synthesizer to provide a stable and adjustable reference freque...

Claims

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Application Information

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IPC IPC(8): H03B7/06
Inventor 张智翔林荣茂杨清渊
Owner IND TECH RES INST
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