Wideband voltage-controlled oscillator circuit with low phase noise and low power consumption

Abstract

The present invention relates to a wideband voltage-controlled oscillator circuit with low phase noise and low power consumption. A conventional wideband voltage-controlled oscillator has poor noiseproof performance and high power consumption and the application of the conventional wideband voltage-controlled oscillator in a radio-frequency communication system is limited. The wideband voltage-controlled oscillator circuit of the present invention comprises one negative-resistance oscillation structure and two buffer structures, wherein the negative-resistance oscillation structure comprises a negative-resistance structure and a resonant network; the negative-resistance structure comprises two PMOS (Positive Channel Metal Oxide Semiconductor) transistors and two NMOS (Negative Channel Metal Oxide Semiconductor) transistors; the resonant network comprises a resonant inductor, a switched capacitor array, two variable capacitors and two fixed capacitors; the switched capacitor array comprises fifteen switched capacitor units to form four controlled selection ends for realizing sixteen frequency band selections; each switched capacitor unit comprises two MOM (Metal-Oxide-Metal) capacitors, two inverters and one NMOS transistor; and three-dimensional interdigital capacitors are adopted as the MOM capacitors. The oscillator circuit of the present invention realizes a wide frequency regulating range and realizes the performance of low phase noise and low power consumption through corresponding phase noise optimization.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and relates to a low-phase-noise, low-power-consumption broadband voltage-controlled oscillator circuit. Background technique [0002] In recent years, wireless communication has developed rapidly, and the working frequency range involves 100M to 10G, so it is necessary to design a low-power wideband transceiver to meet the requirements of various wireless communication protocols. As the most basic building block in the transceiver, the voltage-controlled oscillator provides the local oscillator frequency for transmission and reception, and is the module with the highest operating frequency in the system. Under the premise of ensuring power consumption and phase noise, the voltage-controlled oscillator should have a wide frequency coverage to meet the needs of different applications. [0003] Commonly used structures for oscillators are LC oscillators and ring oscillators. The ring osc...

AI Technical Summary

Problems solved by technology

However, connecting too many switched capacitors in parallel to the resonant circuit will significantly reduce the quality factor of the circuit, resulting in deterioration of the phase noise of the oscillation output, increased power consumption, and prolonged start-up time

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