Inductance-capacitance numerical control oscillator

Abstract

An inductance-capacitance numerical control oscillator in the communication technical field comprises a control deposit unit, a coupling MOS tube, an integrated inductance and a plurality of capacitance arrays, wherein, an input end of the control deposit unit receives an array tuning word output by a numerical control bus, an output end of the control deposit unit is connected with a plurality ofthe capacitance arrays in parallel, and the coupling MOS tube and the integrated inductance are respectively connected with the capacitance arrays in parallel. Compared with the prior art, output frequency resolution ratio is 10 times higher in the case of no capacitance shaking; and if applied in an all digital phase-locked loop, the high frequency resolution ratio of the numerical control oscillator means the integrally output low-phase noise. In addition, the numerical control oscillator of the invention can eliminate the capacitance arrays using delta-sigma modulator shaking control in abetter process (characteristic dimension is less than 65nm) or some communication standards, thus realizing simplifying circuit design further and reducing power consumption and occupied area.

Description

technical field [0001] The invention relates to a component in the field of communication technology, in particular to an inductance-capacitance numerically controlled oscillator used in a wireless radio frequency communication transceiver. Background technique [0002] The traditional phase-locked loop system applied to wireless radio frequency communication belongs to the mixed signal category, and there are conversions between digital-analog, analog-digital and analog-frequency quantities among its modules. The concept of an all-digital phase-locked loop, then It is to unify the input and output signals between each module into digital quantities, so as to rewrite traditional analog and RF modules with digital design methods, reduce the locking time of the phase-locked loop, improve the integration of the chip, save the chip area, and shorten Design cycle. [0003] Due to the above advantages, the all-digital phase-locked loop (ADPLL) that replaces the traditional phase-...

AI Technical Summary

Problems solved by technology

However, due to the physical properties of the variable capacitor (Varactor) in the integrated circuit process, the frequency output resolution obtained by switching a single variable capacitor is relatively low.

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