LC voltage-controlled oscillator with dynamic bias adjustment

Abstract

The invention discloses an LC voltage-controlled oscillator with dynamic bias adjustment. The LC voltage-controlled oscillator comprises a cross coupling pair, an LC resonant cavity, a frequency tuning module and a peak detection module, wherein two differential output ports of the cross coupling pair are respectively connected with two input ports of the LC resonant cavity, the frequency tuning module and the peak detection module in parallel, and the two differential output ports are used as output ports of the LC voltage-controlled oscillator; the differential input port of the cross coupling pair is connected with the output port of the peak detection module, and the cross coupling pair realizes dynamic bias adjustment according to the peak of the output signal detected by the peak detection module in real time. The working point of the core circuit is automatically adjusted along with the output signal after rapid oscillation starting, and the circuit efficiency is improved. And meanwhile, the current waveform is improved, the power is reduced, deterioration of phase noise is avoided, and an oscillator with excellent phase noise while rapid oscillation starting under low voltage and low power consumption is realized.

Description

technical field [0001] The invention relates to an LC voltage-controlled oscillator with dynamic bias adjustment, which belongs to the technical field of radio frequency circuits. Background technique [0002] In the RF transceiver, the frequency divider provides a stable and reliable local oscillator signal for the entire transceiver link, and the voltage-controlled oscillator is a core module of the phase-locked loop. The transceiver link has a crucial impact. Therefore, in order to achieve low power consumption and high performance of the overall receiving circuit, it is of critical significance to optimize the design of the voltage-controlled oscillator. [0003] The LC voltage-controlled oscillator circuits currently used in the mainstream mainly include standard oscillator circuits, oscillator circuits with tail current sources, and capacitively coupled C-type oscillator circuits. However, when the power supply voltage drops and the power consumption decreases, the f...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of difficulty in starting oscillation of the LC voltage-controlled oscillation circuit under low voltage and the deterioration of phase noise under low power consumption, and provide an LC voltage-controlled oscillator with dynamic bias adjustment. Automatically adjusts the gate voltage following the oscillation waveform, improving oscillator current efficiency without adding noise

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