Voltage-controlled oscillator

Abstract

The invention provides a voltage-controlled oscillator which comprises a first delay module and a second delay module. The first delay module comprises a first switch unit and a first current supply unit, and the second delay module comprises a second switch unit and a second current supply unit. The first current supply unit is electrically connected with the first switch unit, the second currentsupply unit is electrically connected with the second switch unit, and the first switch unit is electrically connected with the second switch unit. The first delay module generates a first total delay time adjustable by the first current supply unit according to the first switch unit and the first current supply unit. The second delay module generates a second total delay time adjustable by the second current supply unit according to the second switch unit and the second current supply unit, and the frequency of an output signal of the root-pressing oscillator is associated with the first total delay time and the second total delay time. The voltage-controlled oscillator has a wider adjusting range, and the situation that the specified output frequency cannot be reached is avoided.

Description

technical field [0001] The present invention relates to the technical field of radio frequency integrated circuits, in particular to a voltage-controlled oscillator. Background technique [0002] The voltage-controlled oscillator circuit is a circuit whose output signal frequency is controlled by the input voltage, and is usually used to generate the local oscillator frequency signal of the radio frequency circuit. Existing voltage-controlled oscillator circuits are usually made of inductors and capacitors. Since existing voltage-controlled oscillator circuits require inductance, it is difficult to integrate existing voltage-controlled oscillator circuits in integrated circuits and require a large amount of chip area. Therefore, the manufacturing cost of the circuit is increased. Moreover, the existing voltage-controlled oscillator circuit changes the output signal frequency by adjusting the capacitance of the capacitor. Since the capacitance of the capacitor has a small ra...

AI Technical Summary

Problems solved by technology

Existing voltage-controlled oscillator circuits are usually made of inductors and capacitors. Since existing voltage-controlled oscillator circuits require inductance, it is difficult to integrate existing voltage-controlled oscillator circuits in integrated circuits and require a large amount of chip area. Thereby increasing the production cost of the circuit

And the existing voltage-controlled oscillator circuit changes the frequency of the output signal by adjusting the capacitance of the capacitor. Since the capacitance of the capacitor varies in a small range, the range of the output signal frequency is small. In the case of process changes, the output signal The frequency cannot reach the specified output frequency, resulting in the failure of the RF circuit to obtain the specified local oscillator signal and fail to work normally

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