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Voltage-controlled oscillator with feedback and circuit provided with the same

A voltage-controlled oscillator and circuit technology, applied in power oscillators, electrical components, etc., can solve the problems of increasing VCO DC power consumption, etc., and achieve the effects of simple structure, fast response speed, and large output amplitude

Inactive Publication Date: 2013-04-24
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bias current IB is a quiescent current and remains constant during the operation of the VCO, so this current increases the DC power consumption of the VCO

Method used

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  • Voltage-controlled oscillator with feedback and circuit provided with the same
  • Voltage-controlled oscillator with feedback and circuit provided with the same
  • Voltage-controlled oscillator with feedback and circuit provided with the same

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Embodiment Construction

[0015] The embodiments of the voltage-controlled oscillator with feedback proposed by the present invention will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0016] In one embodiment, a VCO circuit with feedback such as figure 2 As shown, it includes the first MOS transistor MP1, the second MOS transistor MP2, the third MOS transistor MN3, the fourth MOS transistor MN4, the LC resonance unit, the fifth MOS transistor MN5, the sixth MOS transistor MN6, the seventh MOS transistor MN7, The eighth MOS transistor MN8 and the reference current source IREF. For ease of description, the first to eighth MOS transistors are referred to as MP1, MP2, MN3, MN4, MN5, MN6, MN7 and MN8 below, respectively.

[0017] refer to figure 2 , in this voltage controlled oscillator, MP1 tube and MP2 tube form a negative ...

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Abstract

A voltage-controlled oscillator with feedback comprises a first metal oxide semiconductor (MOS) tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a launch control (LC) resonance unit, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube and a reference current source. Grid electrodes of the fifth MOS tube and the sixth MOS tube are respectively connected with two output ends of differential output voltage of the voltage-controlled oscillator. Drain electrodes of the fifth MOS tube and the sixth MOS tube are respectively connected with supply voltage. Source electrodes of the fifth MOS tube and the sixth MOS tube are respectively connected with the reference current source and a drain electrode and a grid electrode of the seventh MOS tube. A current mirror is formed by the seventh MOS tube and the eighth MOS tube and bias current is offered for a differential oscillating circuit through the eighth MOS tube. A circuit comprises the voltage-controlled oscillator. Due to dynamic bias to the voltage-controlled oscillator, direct current power consumption is reduced.

Description

technical field [0001] The invention belongs to the field of analog circuit design, in particular to a voltage-controlled oscillator with feedback and a circuit. Background technique [0002] The fully differential negative resistance LC voltage-controlled oscillator (VCO) using a bias current source can output a differential oscillation signal. The amplitude of the output signal is controlled by the bias current source, so it is relatively stable, with high frequency accuracy and low phase noise. And other characteristics, it has a wide range of applications in the clock generation circuit and so on. [0003] A typical VCO circuit such as figure 1 As shown, where IB is the bias current source, and the current mirror composed of MN6 and MN5 tubes provides the bias current to the oscillation circuit. However, the bias current IB is a quiescent current and remains constant during the operation of the VCO, so this current increases the DC power consumption of the VCO. Conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04
Inventor 王自强宋奕霖姜珲张春麦宋平姜汉钧王志华
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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