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Voltage Controlled Oscillation Circuit

A voltage-controlled oscillating circuit and oscillating circuit technology are applied in the field of wireless communication, which can solve the problems of inability to accurately obtain the body of the transmitted signal and affect the quality of communication services, and achieve the effects of reducing low-frequency noise and harmonic signals and reducing phase noise.

Active Publication Date: 2019-02-01
GUANGDONG HEWEI INTEGRATED CIRCUIT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-frequency noise harmonic signal follows the oscillating signal generated by the oscillating circuit to form a carrier signal output. In the wireless transmission process, the carrier signal is sent to the destination together with the transmitted signal body, especially the effect of the low-frequency harmonic signal makes the phase of the output signal Random changes. The destination modem analyzes the received signal. Because the carrier signal contains low-frequency noise harmonic signals and the phase of the received signal changes randomly, the modem cannot accurately obtain the transmitted signal body when analyzing the received signal. Directly affects the quality of service (QoS) of communication

Method used

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  • Voltage Controlled Oscillation Circuit
  • Voltage Controlled Oscillation Circuit
  • Voltage Controlled Oscillation Circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] According to the above technical analysis, the present application provides a voltage-controlled oscillator circuit that effectively filters low-frequency noise and reduces the overall phase noise of the oscillator.

[0051] image 3 A schematic structural diagram of a voltage-controlled oscillator circuit provided in Embodiment 1 of the present invention. This embodiment can be applied to modulation and demodulation devices, specifically including the following

[0052] A voltage-controlled oscillator circuit, including:

[0053] Bandgap reference unit 11: including a first output terminal, a second output terminal, and a third output terminal; the bandgap reference unit 11 is used to output the first reference voltage through the first output terminal, and the second output terminal to output the second reference voltage, the third output end outputs a third reference voltage,

[0054] Filtering unit 12, the input terminal is connected to the first output terminal o...

Embodiment 2

[0068] In the above-mentioned embodiment, the filter unit 12 is mainly formed by a filter resistor 121 and a filter capacitor 122, but the larger the resistance value of the filter resistor 121, the larger the area occupied by the filter resistor 121, and the same is true for the filter capacitor 122. All oscillators are integrated in the chip, and the filter resistor 121 with large resistance value and the filter capacitor 122 with large capacity need to occupy a large area of ​​layout, which is not conducive to the integration of products.

[0069] In order to realize the integrated design of the oscillation circuit 14, Figure 4 The schematic diagram of the structure of the voltage-controlled oscillation circuit provided by the second embodiment of the present invention. On the basis of the above-mentioned embodiments, the present embodiment uses the MOS transistors working in the linear working area to form the filter resistor 121, and uses the source and drain The connect...

Embodiment 3

[0088] Continuing to refer to the above basic scheme, it can be seen that the low-frequency noise harmonic signal of the first reference voltage is filtered, but there are still low-frequency noise harmonic signals in the second reference voltage and the third reference voltage, which are powered by the second reference voltage and the third reference voltage Electrical components also output signals with low-frequency noise harmonic signals.

[0089] Figure 7 Shown is a schematic structural diagram of a voltage-controlled oscillating circuit provided by Embodiment 3 of the present invention, which further effectively filters low-frequency noise and reduces the overall phase noise of the oscillator.

[0090] A voltage-controlled oscillator circuit, including:

[0091] The bandgap reference unit 21 includes an output terminal for outputting a bandgap reference voltage.

[0092] Filter unit 22, the input end is connected to the output end of the bandgap reference unit 21, the...

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PUM

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Abstract

The embodiment of the invention relates to a wireless communication technology, and in particular relates to a voltage-controlled oscillating circuit. The voltage-controlled oscillating circuit comprises a band gap reference unit, a filtering unit, a LDO voltage stabilizing circuit, a current bias unit, a voltage stabilizing unit and voltage control bias. The input end of the filtering unit is connected to the band gap reference unit; the forward input end of the LDO voltage stabilizing circuit is connected to the output end of the filtering unit; the reverse input end of the LDO voltage stabilizing circuit is connected to an acquisition unit; the output end of the LDO voltage stabilizing circuit is connected to the power supply end of an oscillating circuit; the input end of the current bias unit is connected to the band gap reference unit; the output end of the current bias unit is connected to the LDO voltage stabilizing circuit; the input end of the voltage stabilizing unit is connected to the band gap reference unit; the output end of the voltage stabilizing unit is connected to the oscillating circuit; the input end of the voltage control bias is connected to the band gap reference unit; and the output end of the voltage control bias is connected to the voltage control end of the oscillating circuit. According to the voltage-controlled oscillating circuit disclosed by the invention, noise of a low-frequency band can be effectively filtered through the filtering unit, and the overall phase noise of an oscillator can be reduced.

Description

technical field [0001] The embodiment of the present invention relates to a wireless communication technology, in particular to a voltage-controlled oscillator circuit. Background technique [0002] With the continuous advancement of semiconductor process technology, the data transmission speed of modern communication technology is also getting faster and faster, so the technical parameters of the communication system are required to be higher and higher. VCO voltage controlled oscillator is an important part of radio frequency circuit. Most radio frequency circuits use modulation and demodulation, so they rely heavily on local oscillators. Modern communication technology requires new technologies such as multiplexing and frequency hopping. Using voltage to control the filter capacitance of the filter capacitor in the oscillating circuit, and then changing the resonant frequency of the oscillating circuit has become one of the means to realize these technologies. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/02
CPCH03B5/02
Inventor 许国辉邝国华
Owner GUANGDONG HEWEI INTEGRATED CIRCUIT TECH