Integrated inductance capacitance voltage-controlled oscillator for ultra-wideband low-phase noise

Abstract

The invention discloses an integrated inductance capacitance voltage-controlled oscillator comprises four programmable negative resistance type LC (inductance capacitance) oscillating core circuits, a public output stage and a current amount programmable offset module, wherein the public output stage is connected with the four programmable negative resistance type LC oscillating core circuits; and the current amount programmable offset module is connected with the four programmable negative resistance type LC oscillating core circuits through a controlled switch. Compared with the common voltage-controlled oscillator, the integrated inductance capacitance voltage-controlled oscillator has obvious disadvantages in debugging range, phase noise, and other aspects; and in addition, the invention is specially suitable for a demanding multistandard multiband radio-frequency radio communication system.

Description

technical field [0001] The invention belongs to the technical field of radio-frequency front-end (Radio-Frequency Front-End) of a wireless communication system, and in particular relates to the structural design of a voltage-controlled oscillator used for the front-end of a wireless communication system. Background technique [0002] In recent years, with the prosperity of the wireless communication market, radio frequency integrated circuits (RFICs) have developed rapidly. These wireless applications mainly include: mobile phone, global positioning system (GPS), bluetooth (Bluetooth), wireless local area network (WLAN) and mobile TV. In these application systems, the radio frequency circuit is the key to the design of the entire transceiver system, so it has attracted much attention for many years. [0003] In the whole wireless communication system, the voltage-controlled oscillator (VCO), as an oscillator whose output frequency changes with the input tuning voltage, is t...

AI Technical Summary

Problems solved by technology

However, too many switched capacitors will not only significantly increase the design complexity, but also process deviation and excessive parasitic benefits will offset some of the benefits of switched capacitors

At the same time, too many switched capacitors connected 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. It is difficult to meet the multi-standard multi-band single chip mentioned above. Integrated System Requirements

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