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Voltage-controlled oscillator circuit with frequency not changing with temperature

A technology of voltage-controlled oscillators and oscillation circuits, applied to electrical components, output stability, etc.

Inactive Publication Date: 2015-01-21
HANGZHOU CANAANTEK COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous reduction of process feature size, the power supply voltage is also continuously reduced. In addition, modern wireless communications have strict requirements for a wider frequency adjustable range and lower phase noise for voltage-controlled oscillators. The frequency caused by temperature changes Drift is more serious for the entire RF transceiver chip

Method used

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  • Voltage-controlled oscillator circuit with frequency not changing with temperature
  • Voltage-controlled oscillator circuit with frequency not changing with temperature
  • Voltage-controlled oscillator circuit with frequency not changing with temperature

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Embodiment Construction

[0036] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, a voltage-controlled oscillator circuit whose frequency does not change with temperature, the circuit includes: a first cross-coupling tube 10, an LC oscillation circuit 20, a second cross-coupling tube 30, a mirror current source circuit 40, a voltage dividing resistor 50 and filter capacitor 60 .

[0038] The two output ends of the LC oscillation circuit 20 are connected in parallel with the two output ends of the first cross-coupling tube 10; the two input ends of the second cross-coupling tube 30 are respectively connected in parallel with the LC oscillation circuit 20; the input terminal of the mirror current source circuit 40 is input A negative temperature coefficient current with a slope; one end of the voltage dividing resistor 50 is connected to the power input end of ...

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Abstract

The invention discloses a voltage-controlled oscillator circuit with frequency not changing with temperature. The circuit comprises a first cross coupling tube, an LC oscillating circuit connected with the two output ends of the first cross coupling tube in parallel, a second cross coupling tube connected with the LC oscillating circuit in parallel, a mirror image current source circuit, a divider resistor arranged between the first cross coupling tube and the output end of the mirror image current source circuit, and a filter capacitor connected with the output end of the mirror image current source circuit. Because a pair of variable capacitors are arranged on the LC oscillating circuit and negative temperature coefficient current with slope is input to the mirror image current source circuit, on the premise that the complexity and the power consumption of the circuit are not increased and high performance is achieved, it is avoided that because the working state of the first cross coupling tube and the working state of the second cross coupling tube change, the oscillating frequency at the signal output end of the VCO circuit changes, and finally, the frequency drift caused by temperature changes can be effectively overcome or counteracted.

Description

technical field [0001] The invention relates to a control circuit in the field of navigation and communication, in particular to a voltage-controlled oscillator circuit whose frequency does not vary with temperature. Background technique [0002] Phase-locked loop frequency synthesizer is an indispensable part in the system architecture of radio frequency transceiver chips such as wireless communication and multi-mode navigation at the present stage. The voltage controlled oscillator (Voltage Controlled Oscillator, referred to as VCO) is the core component of the phase-locked loop frequency synthesizer. The output frequency of the frequency synthesizer is generated by the voltage controlled oscillator. oscillator service. Modern wireless radio frequency communications have strict requirements on phase noise, and in order to meet this requirement, LC oscillators are generally used. The LC oscillator has the advantages of good phase noise, high frequency stability, and littl...

Claims

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Application Information

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IPC IPC(8): H03L1/02
Inventor 韩业奇倪文海徐文华
Owner HANGZHOU CANAANTEK COMM TECH
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