Accurate quadrature voltage-controlled oscillator circuit with phase adjustable

Abstract

The invention belongs to the technical field of simulated radio frequency integrated circuits, in particular to an accurate quadrature voltage-controlled oscillator capable of achieving phase adjusting and capable of being applied to a radio frequency synthesizer integrated circuit. The circuit is mainly an injection-locking quadrature voltage-controlled oscillator. The injection-locking quadrature voltage-controlled oscillator is composed of a negative resistance network, an on-chip inductance-capacitance resonant cavity, a voltage-controlled variable capacitor and an adjustable biasing circuit. The quadrature voltage-controlled oscillator is composed of two injection-locking quadrature voltage-controlled oscillator units, coupling of signals of the injection-locking quadrature voltage-controlled oscillator is carried out through a series injection mode, and the purpose of outputting quadrature signals is achieved. The adjustable biasing circuit comprises current bias of the quadrature voltage-controlled oscillator and DC voltage bias of quadrature signal coupling injection. By adjusting the bias currents and the bias voltages, the phases of the output signals are made to be adjustable, phase errors caused by fabrication errors, device adaptation and the like can be corrected, and accurately output quadrature signals can be obtained.

Description

technical field [0001] The invention belongs to the technical field of analog radio frequency integrated circuits, and in particular relates to a precise quadrature voltage-controlled oscillator (Quadrature Voltage-Controlled Oscillator) that can realize phase adjustment. Background technique [0002] In today's society, information technology is developing rapidly. With the rapid development of the Internet, users' demand for high-speed and high-quality broadband video and multimedia services continues to grow, and traditional communication technologies can no longer meet the demand. Due to its huge bandwidth and ultra-high transmission rate, optical communication technology has become the preferred technology in the field of communication applications, so it has also become a research hotspot at home and abroad. As the core chip in optical communication applications, ultra-high-speed analog-to-digital converter (ADC) has become a research hotspot at home and abroad, and t...

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Problems solved by technology

The quadrature mismatch of the local oscillator signal will introduce additional image interference signal, thereby reducing the signal-to-noise ratio of the wireless receiver

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