Circulation analog-to-digital converter combined with TDC (time-to-digital converter)

Abstract

A circulation analog-to-digital converter combined with a TDC (time-to-digital converter) is used for realizing two conversion steps of sampled analog voltage signals and comprises a circulation analog-to-digital conversion unit and a time-to-digital conversion unit. The circulation analog-to-digital conversion unit is used for performing the first data conversion step, quantizing the sampled analog voltage signals to acquire most significant bit and then sending residual voltage into the time-to-digital conversion unit. The time-to-digital conversion unit is used for performing the second data conversion step, converting the residual voltage into time signals to acquire the first least significant bit and the second least significant bit, and then adding the first least significant bit and the second least significant bit together to complete the two conversion steps. The circulation analog-to-digital converter combined with the TDC has the advantages that conversion rate is increased, conversion precision is guaranteed, power consumption is saved, quantization of analog signals is realized, requirements in actual application are met, requirements for sub circuits are reduced as compared with that of conventional single-circuit modules, and thus conversion is easy to realize on boards.

Description

technical field [0001] The invention relates to a cyclic analog-to-digital converter. In particular it relates to a cyclic analog-to-digital converter incorporating a TDC. Background technique [0002] Cyclic analog-to-digital converters are used in products with medium to high precision and low to medium conversion rates, especially in applications requiring low power consumption and low chip area. Achieving high resolution while consuming smaller chip size and lower power consumption are the main advantages of cyclic ADCs. [0003] TDC (time-to-digital converter) is a commonly used circuit for time measurement. It mainly calculates the time from the reference signal to the occurrence of the event and the time interval between two pulses, and directly converts the time interval into a high-precision digital value. In the analog-to-digital converter, the fast conversion of data can be realized by converting the analog voltage into a time signal and then processed by the TD...

AI Technical Summary

Problems solved by technology

However, when performing high-precision data conversion, extremely high clock frequency and corresponding processing circuits are required, which requires more chip area and power consumption while increasing the design complexity of the system, which limits its application in analog-to-digital conversion. applications in the

However, the TDC conversion accuracy is low under the low-frequency clock, which cannot meet the bit requirements of the analog-to-digital converter.

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