Coarse Tuning Element Arrays and Related Devices Applied to Numerically Controlled Oscillators

Abstract

The embodiment of the present invention discloses a coarse adjustment unit array and a related device for a numerically controlled oscillator. A coarse adjustment unit array applied to a numerically controlled oscillator includes X coarse adjustment units, and each of the coarse adjustment unit arrays The coarse adjustment unit comprises logic unit and W fine adjustment units; The input of the logic unit of the coarse adjustment unit i in the described coarse adjustment unit array comprises Y coarse adjustment control bits and W fine adjustment control bits, and the coarse adjustment unit The output of logic unit i is used to control whether the W fine adjustment units in the coarse adjustment unit i work; the Y is an integer greater than 1, and the X and W are integers greater than 1. The technical solution provided by the embodiment of the present invention is beneficial to avoid the Mismatch problem as much as possible while ensuring reasonable logic control bits, so as to improve the performance of related circuits.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a coarse adjustment unit array and a related device applied to a numerically controlled oscillator. Background technique [0002] A digitally controlled oscillator (DCO, Digitally Controlled Oscillator) is a very common circuit device. DCO is widely used in many circuits (such as phase-locked loop circuits), and DCO can be referred to as digitally controlled oscillator for short. [0003] The DCO controls the frequency of the oscillator through a discrete digital signal. Therefore, the frequency of the DCO is discrete, and the step size of the frequency change is a function of the digital control bit. This characteristic of the DCO is different from the continuity of the frequency change of the traditional analog voltage-controlled oscillator. The minimum step size of the DCO will directly determine the quantization noise contributed by the DCO. Wherein, the smaller the fre...

AI Technical Summary

Problems solved by technology

However, in the traditional DCO capacitor array, there is often a mismatch problem when the fine-tuning unit carries over to the coarse-tuning unit. Practice has found that this Mismatch directly affects circuit performance, and sometimes the impact of Mismatch on circuit performance is difficult to ignore.

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