Asynchronous successive approximation type A/D (analog to digital) converter

Abstract

The invention provides an asynchronous successive approximation type A/D (analog to digital) converter. The asynchronous successive approximation type A/D converter comprises an A/D converter suitable for obtaining two input signals according to a sampled signal, a comparator suitable for comparing voltage values of the two input signals so as to generate a comparative result and convert the comparative result into a first control signal, a sequential pulse generator suitable for generating first output signals according to the sampled signal and the first control signal and controlling electrical levels of the first output signals to rise sequentially from the highest electrical level to the lowest electrical level, an asynchronous successive approximation type register suitable for triggering second output signals together with the first output signals according to the comparative result, latching the trigged second output signals according to rising edges of the first output signals and adjusting the voltage values of the two input signals of the A/D converter according to the second output signals, and a logic switch controller which comprises a delay module, is suitable for generating a second control signal with a delayed falling edge, and further used for generating an enable signal, and then controls work states of the comparator according to the enable signal. The asynchronous successive approximation type A/D converter improves A/D conversion speed.

Description

technical field [0001] The invention belongs to the technical field of analog or analog-digital mixed integrated circuits, in particular to a high-speed asynchronous successive approximation analog-to-digital converter of an asynchronous successive approximation register. Background technique [0002] The rapid development of digital technology in recent years has led to higher and higher conversion speed requirements for analog-to-digital converters in various systems. Among them, successive approximation analog-to-digital converters are simple in structure, small in area, and high in power consumption. And widely used in various fields. However, the structure of the traditional asynchronous successive approximation register is simple. At a high operating frequency, the time delay caused by the series operation of D flip-flops compresses the settling time of the ADC and affects the overall performance of the ADC. The asynchronous successive approximation registers cannot m...

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Problems solved by technology

[0012] In view of the shortcomings of the prior art described above, the object of the present invention is to provide an asynchronous successive approximation analog-to-digit

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