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Noise shaping time to digital converter

A technology of digital converter and time, applied in the direction of time-to-digital converter, analog/digital conversion, code conversion, etc., can solve the problem of reducing the performance of TDC noise shaping

Active Publication Date: 2011-10-05
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional ring oscillator based TDCs are highly voltage dependent during stop and start periods, degrading the TDC's noise-shaping performance

Method used

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  • Noise shaping time to digital converter

Examples

Experimental program
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Embodiment Construction

[0015] figure 1 An embodiment of a time-to-digital converter (TDC) 100 is illustrated. TDC 100 includes digitally controlled oscillator (DCO) 110 , counter circuit 120 , evaluation circuit 130 and pulse generator 140 . The TDC 100 utilizes noise shaping to provide very high resolution time measurements. When the TDC 100 operates at a frequency (REF) that is multiple times higher than the bandwidth of the signal of interest (START), the TDC 100 has a relatively high signal-to-noise ratio (SNR) compared to conventional non-noise-shaping TDCs. In addition, the TDC 100 performs quantization noise shaping by shifting the quantization noise towards higher frequencies. Optionally high frequency noise can be filtered, which results in a significant increase in SNR depending on the oversampling ratio employed by the TDC 100 .

[0016] The shaped quantization noise can be modeled as white noise filtered by a difference filter. In a sampled system, the transfer function of the differ...

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Abstract

According to an embodiment of a time to digital converter, the time difference between a signal of interest and a reference signal is measured by operating a digitally controlled oscillator at a first frequency during a first portion of the reference signal period and changing the operating frequency from the first frequency to a second frequency during the reference signal period as a function of the time difference between the signal of interest and the reference signal. The time to digital converter continuously counts how many signal transitions occur at an output of the digitally controlled oscillator during the reference signal period. The time difference between the signal of interest and the reference signal is estimated based on the number of signal transitions counted during thereference signal period.

Description

technical field [0001] The present invention relates generally to time-to-digital converters, and more particularly to noise-shaping time-to-digital converters. Background technique [0002] A digital representation of the arrival time of each input pulse for a time-to-digital converter (TDC) output signal. A TDC can be formed by chaining together a string of inverters. A start pulse is propagated through the inverter chain and sampled with a stop pulse. The number of inverters the start pulse passes through provides a digital measure of the time from start to stop. The resolution associated with this type of TDC is usually limited by the inverter gate delay which is highly dependent on current, voltage and temperature. Also, the linearity of TDCs is limited by device mismatches and is usually traded off against speed and resolution. A smaller inverter stage is required to improve the resolution of the TDC because the smaller inverter reduces the parasitic capacitance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/50H03L7/081G04F10/04
CPCH03L2207/50G04F10/005H03L7/08
Inventor S 埃克
Owner TELEFON AB LM ERICSSON (PUBL)
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