Analogue-digital conversion circuit and production line analogue-digital converter

Abstract

The invention relates to an analogue-digital conversion circuit and a production line analogue-digital converter. The circuit is the first level of the production line analogue-digital converter and comprises an SADC module, an MDAC module, a control and measurement module, an MUX module and a correction module; the MUX module is connected between the SADC module and the MDAC module; the control and measurement module is connected with the MUX module and outputs control, enabling and correction signals; and the correction module is connected with the control and measurement module. According to the embodiment, the capacitance mismatching parameters of the production line analogue-digital converter can be obtained, and the production line analogue-digital converter with high precision is realized at cost of relatively low circuit complexity.

Description

technical field [0001] The present disclosure relates to the field of integrated circuits, in particular to an analog-to-digital conversion circuit and a pipelined analog-to-digital converter. Background technique [0002] A pipelined analog-to-digital converter (ADC, Analog-to-Digital Converter) is composed of several levels of modules with similar functions, and each module includes a sub-analog-to-digital conversion (SADC) module and a digital-to-analog conversion and amplification (MDAC) module. [0003] The accuracy of the pipeline ADC is closely related to the signal processing accuracy of the MDAC module, and the working parameters of the MDAC module will affect the signal processing accuracy of the MDAC module. For example, the non-ideality of capacitor matching in the MDAC module has a great influence on the accuracy of the MDAC module. The impact of capacitance mismatch on the output error of MDAC has two aspects: one is the mismatch item that has nothing to do wi...

AI Technical Summary

Problems solved by technology

However, increasing the capacitance area will increase the input load of the pipeline ADC and the load of the operational amplifier (OPA), which not only increases the power consumption of the pipeline ADC, but also significantly increases the design difficulty of sampling switches, OPA and other modules; the method of using analog capacitance compensation requires complex The switched capacitor network significantly increases the complexity of the analog circuit and increases the difficulty of the layout; the digital capacitance compensation method has high requirements for the measurement accuracy of the MDAC capacitance mismatch, and the traditional measurement scheme requires multiple high-precision pipeline ADC inputs. DC voltage, the cost of the test environment is very high

Images