Reference voltage generation circuit of voltage-controlled oscillator

The pressure-controlled oscillator base voltage generation circuit addresses the temperature instability of VCOs by using a circuit with PMOS transistors and resistors to generate a compensating base voltage, effectively reducing frequency drift and improving temperature stability.

CN119717987APending Publication Date: 2025-03-2858TH RES INST OF CETC
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Patent Information

Application Number
CN202411880944.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The output frequency of pressure-controlled oscillators (VCOs) experiences drift due to temperature variations, making them unstable for providing a stable clock signal to digital circuits, primarily due to temperature-dependent base voltage generation and inherent frequency drift in the oscillation circuit.

Method used

A pressure-controlled oscillator base voltage generation circuit comprising PMOS transistors, operational amplifiers, resistors, and a PNP transistor, where the base voltage is adjusted to compensate for frequency drift by using resistors with specific temperature coefficients to counteract temperature-induced fluctuations.

Benefits of technology

The proposed circuit effectively reduces frequency drift by generating a base voltage that compensates for temperature-induced changes, enhancing the temperature stability of the VCO output frequency.

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Abstract

The invention discloses a reference voltage generating circuit of a voltage-controlled oscillator, which belongs to the field of integrated circuits and comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube, a second PMOS tube, a first operational amplifier, a second operational amplifier, a first resistor to a fifth resistor, a first PNP (Plug-and-Play) tube and a first reference current source. The temperature characteristic of the reference voltage generated by the circuit can be adjusted by adjusting the resistance, the adjustment is opposite to the temperature drift of the oscillating circuit to form compensation, the change of the output frequency of the voltage-controlled oscillator along with the temperature can be effectively reduced, and the temperature stability of the output frequency is improved.
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