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A voltage controlled oscillator

A technology of voltage-controlled oscillator and voltage-controlled oscillator circuit, which is applied in the direction of automatic power control, electrical components, etc., can solve the problems of compromise of power consumption and phase noise, and wide coverage, so as to achieve the realization of power consumption and phase noise, reduce The effect of starting difficulty and optimal power consumption

Active Publication Date: 2017-09-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a lot of research has been carried out on Class-C voltage-controlled oscillators in academia and industry and some achievements have been made, these Class-C voltage-controlled oscillators still have trade-offs in power consumption and phase noise and wide coverage, etc. many problems

Method used

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Examples

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Embodiment 1

[0049] figure 1 is a schematic diagram of the composition of the voltage-controlled oscillator in Embodiment 1 of the present invention. from figure 1 It can be seen that the voltage-controlled oscillator is mainly composed of a voltage-controlled oscillator circuit 100 and an output drive circuit 200 . Wherein, the voltage-controlled oscillation circuit 100 is divided into an LC resonance unit 110 , an oscillation unit 120 , a bias voltage adjustment unit 130 and a bias current adjustment unit 140 according to functions.

[0050]The LC resonance unit 110 adopts a differential structure, and is composed of a differential inductor L1, capacitors C0-C5, resistors R0-R1, transistors M0-M4 and a varactor diode Var1. The middle tap of the differential inductor L1 is connected to the DC voltage VDD, and the two ends of the differential inductor L1 are connected in parallel with a capacitor array module 111 composed of capacitors C0-C4, transistors M0-M4 and resistor R0, and a capa...

Embodiment 2

[0086] In order to meet the requirements of wide frequency coverage, the present invention also proposes a figure 2 The dual-band voltage-controlled oscillator shown. The dual-band voltage-controlled oscillator is composed of a voltage-controlled oscillator operating at 1.5-1.9GHz and a voltage-controlled oscillator operating at 4.8-5GHz in parallel, and the two voltage-controlled oscillators can share a bias voltage adjustment unit . This dual-band voltage-controlled oscillator can cover commonly used radio frequency bands. It can be flexibly configured in different application scenarios to achieve optimization of power consumption and phase noise. It is especially suitable for low-power radio frequency transceivers that support multiple Wi-Fi protocols. machine chip.

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Abstract

The invention relates to a voltage-controlled oscillator, which includes a voltage-controlled oscillator circuit, and the voltage-controlled oscillator circuit includes an LC resonance unit, an oscillation start-up unit and a bias voltage adjustment unit. Wherein, the oscillating unit includes a cross-coupled first transistor and a second transistor, the drains of the first transistor and the second transistor are respectively connected to the two ends of the differential inductance of the LC resonant unit, and the voltage of the gate varies with the same bias voltage. change, the source receives the same bias current; the bias voltage adjustment unit provides the bias voltage to the oscillation unit and adjusts its size, so that the conduction angle of the first transistor and the second transistor is between 0 and 180 degrees changes, so that the LC resonant unit starts to oscillate in the CLASS-AB mode and oscillates in the CLASS-C mode. In addition, the voltage-controlled oscillating circuit is further configured with a bias current adjustment unit, which provides a bias current to the oscillating unit to realize power consumption phase noise configuration.

Description

technical field [0001] The invention relates to a voltage-controlled oscillator for a radio frequency chip, in particular to a voltage-controlled oscillator which is easy to vibrate and has low power consumption. Background technique [0002] Since the frequency band of Wi-Fi does not require any telecommunication operating license in the world, WLAN wireless equipment provides a wireless air interface with extremely low cost and high data bandwidth that can be used worldwide. As Wi-Fi coverage has grown in recent years, people have become more and more interested in them. Users can not only realize Bluetooth transmission, high-definition video transmission, and wireless video surveillance within the Wi-Fi coverage area, but also carry out medical and smart home applications. At present, there are many Wi-Fi frequency bands, such as 2.4-2.5GHz in the world, 902-928MHz in the United States, 863-868MHz in Europe, 755-787MHz in China and 950-968MHz in Japan. Faced with a wide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 池保勇韩思扬张泽宏王志华
Owner TSINGHUA UNIV
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