Linear wide-range numerical control oscillator applied to FPGA

Abstract

Provided is a linear wide-range numerical control oscillator applied to an FPGA. The kernel portion of the numerical control oscillator is an annular oscillator body. Output frequency of the oscillator body can be selected according to a frequency selection control word. By means of the configurable characteristic of the FPGA, center output frequency of the numerical control oscillator can be flexibly changed, and accordingly the output frequency of the numerical control oscillator can be continuously and linearly adjusted in a wide range.

Description

technical field [0001] The invention relates to a numerically controlled oscillator, in particular to a numerically controlled oscillator with a wide frequency range applied in FPGA. Background technique [0002] Digitally controlled oscillator (hereinafter referred to as DCO) is essentially an oscillator. The oscillation frequency is controlled by the frequency selection control word. The main difference between DCO and other oscillators is the use of digital control codes to control the output frequency. This feature makes DCO widely used in digital frequency synthesizer. [0003] A typical ring oscillator usually uses an odd number of identical inverters, figure 1 is a typical structure diagram of a three-stage ring oscillator. The inverter in the oscillator is used to provide a fixed delay. The oscillation frequency of the oscillator is given by formula (1). [0004] f osc = 1 2...

AI Technical Summary

Problems solved by technology

However, traditional oscillators can only be adjusted around a specific frequency, which limits the range and occasions that frequency synthesizers can be applied

Images