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Analog-to-digital conversion device

A technology of analog-to-digital conversion and conversion time, applied in the direction of analog-to-digital conversion, code conversion, instruments, etc., can solve the problem of long conversion time, and achieve the effect of improving the performance.

Active Publication Date: 2019-05-24
FARADAY TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in a step-by-step analog-to-digital conversion device, the conversion time required to generate the most significant bit (MSB) is usually longer than the conversion time required to generate other bits
Therefore, under the fixed conversion time setting conditions, either the conversion time of the highest bit is insufficient, or the status of the lowest bit (LSB) conversion time is too long.

Method used

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  • Analog-to-digital conversion device
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  • Analog-to-digital conversion device

Examples

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Embodiment Construction

[0054] Please refer to figure 1 , figure 1 A schematic diagram of an analog-to-digital conversion device according to an embodiment of the present invention is shown. The analog-to-digital conversion device 100 includes switch groups 121-12M, 131-13M, capacitors C11-C1M, C21-C2M, a comparator CMP, a controller 110, and switches SW1 and SW2. The switch group 121-12M receives the input signal vinp and the reference voltages Vtop, Vbot of the input signal pair. The switch group 131 - 13M receives the input signal vinn and the reference voltages Vtop, Vbot of the input signal pair, wherein the voltage value of the reference voltage Vtop is greater than the voltage value of the reference voltage Vbot. The switch groups 121 - 12M are respectively coupled to the first terminals of the capacitors C11 - C1M, and the second terminals of the capacitors C11 - C1M are coupled to each other to generate the comparison voltage VC1 . The switch groups 131-13M are respectively coupled to...

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Abstract

An analog-to-digital conversion device is used for converting an input signal pair to generate an output signal. The analog-to-digital conversion device includes a plurality of switch groups, a plurality of capacitors, a comparator, and a controller. Each switch group receives an input signal pair and a plurality of reference voltages, and selects to output one of the input signal pair and the reference voltages according to a control signal to generate a plurality of selection voltages respectively. Each capacitor receives the selection voltage and generates a first comparison voltage and a second comparison voltage. The comparator generates a comparison result signal according to the comparison of the first comparison voltage and the second comparison voltage. The controller sets a plurality of conversion times for converting a plurality of bits of the output signal according to the comparison result signal. Wherein at least two conversion times in the plurality of conversion times are different.

Description

technical field [0001] The present invention relates to an analog-to-digital conversion device, and in particular to a sequential (Successive approximation, SAR) analog-to-digital conversion device. Background technique [0002] In conventional analog-to-digital converters, the conversion time is the same (one clock cycle) for each bit of the output signal generated. However, in a progressive ADC device, the conversion time required to generate the MSB is generally longer than the conversion time required to generate other bits. Therefore, under the fixed conversion time setting conditions, either the conversion time of the highest bit is insufficient, or the status of the lowest bit (LSB) conversion time is too long. How to maintain the accuracy of the output signal and increase the conversion rate of the analog-to-digital conversion device at the same time is an important issue for those skilled in the art. Contents of the invention [0003] The invention provides an a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/46
CPCH03M1/125H03M1/462H03M1/468H03M1/38H03M1/144H03M1/46H03M1/40H03M1/403
Inventor 吴书东徐峰
Owner FARADAY TECH CORP
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