A time-to-digital converter system and multiple delay phase-locked loop including the system

Abstract

The invention discloses a time-to-digital converter system and a multiple delay phase-locked loop comprising the same. The system comprises a first-level time-to-digital converter, a first-level digital-to-time converter, a first-level time amplifier, a second-level time-to-digital converter, a second-level digital-to-time converter, a second-level time amplifier, a third-level successive approximation register type analog-to-digital converter and a digital-to-analog-to-digital converter. The time-to-digital converter system provided by the invention and the multiple delay phase-locked loop capable of lowering in-band quantization noise use a cascade algorithm similar to Delta-Sigma, the accuracy of the time-to-digital converter applied to the multiple delay phase-locked loop is effectively improved, the quantization noise is lowered, and the generation of the stray of the multiple delay phase-locked loop is eliminated.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a time-to-digital converter system and a multiple delay phase-locked loop comprising the system. Background technique [0002] With the advancement of technology, in the application of all-digital chips, in order to convert the off-chip low-frequency oscillator input signal into a high-frequency clock signal, the use of on-chip frequency multiplier clock has occupied an important position. In order to obtain a stable high-frequency clock signal that is not affected by phase noise, the multiple delay phase-locked loop must have the function of suppressing phase noise. In addition, with the rise of handheld devices, low power consumption has become an indispensable condition in order to prolong the battery life of the handheld devices. [0003] In the multiple delay phase-locked loop, the voltage-controlled oscillator is a loop loop, so the jitter generated by the volt...

AI Technical Summary

Problems solved by technology

However, the disadvantage of using a digital multiple DLL is that its in-band quantization noise is determined by the time-to-digital converter

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