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Successive approximation type analog-to-digital converter of energy-saving capacitor array

A successive approximation type, analog-to-digital converter technology, applied in analog-to-digital conversion, code conversion, instruments, etc., can solve the problems of digital circuit reduction, analog circuit power consumption reduction, circuit gain limitation, etc.

Active Publication Date: 2011-04-06
FUDAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, as the power supply voltage decreases, the gain of the circuit is limited, and the structure of the successive approximation analog-to-digital converter only includes a comparator, a digital-to-analog converter, and a successive approximation register without a circuit that provides gain
The power consumption of digital circuits will continue to decrease as the process size shrinks (scaling-down), while the power consumption of analog circuits is difficult to reduce with the progress of the process

Method used

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  • Successive approximation type analog-to-digital converter of energy-saving capacitor array
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  • Successive approximation type analog-to-digital converter of energy-saving capacitor array

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Embodiment Construction

[0024] The present invention is further described below with reference to the accompanying drawings.

[0025] image 3 , 4 , 5, 6, and 7 are schematic diagrams of the energy-saving successive approximation analog-to-digital converter proposed by the present invention. The schematic diagram takes 4 bits as an example. image 3 is the first 3-bit conversion, Figure 4 , 5 , 6, 7 are the 4th bit conversion, and its working principle is:

[0026] (1) The analog input signal obtains the hold signal through the track and hold circuit (31), and the energy consumption of the first switch is 0 (38).

[0027] (2) According to the size of the hold signal on the capacitor array, the comparator makes a comparison and judges V ip and V in the size of. When V ip >V in When the energy-saving capacitor array digital-to-analog converter consumes 0 (39) of energy for the second switching, when V ip in When the energy-saving capacitor array digital-to-analog converter consumes 0 (40) en...

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Abstract

The invention belongs to the technical field of integrated circuits, in particular to a successive approximation type analog-to-digital converter of an energy-saving capacitor array. The analog-to-digital converter comprises a sampling switch, a track and hold circuit, a comparator, control logic and a capacitor array digital-to-analog converter, wherein the capacitor array digital-to-analog converter adopts a switch mode of the novel capacitor array digital-to-analog converter provided by the invention. By using the mode, the average switch consumption of the capacitor can be reduced.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a successive approximation analog-to-digital converter. Background technique [0002] The successive approximation analog-to-digital converter is an analog-to-digital converter structure with medium and high precision, medium conversion rate and ultra-low power consumption. For sensors, portable equipment, and biological applications, analog-to-digital converters are required to operate at low supply voltages. However, as the power supply voltage decreases, the gain of the circuit is limited, and the structure of the successive approximation analog-to-digital converter only includes a comparator, a digital-to-analog converter and a successive approximation register without a circuit that provides gain. The power consumption of digital circuits will continue to decrease as the process size shrinks (scaling-down), while the power consumption of analog circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38
Inventor 任俊彦顾蔚如王明硕王振宇叶凡许俊李宁
Owner FUDAN UNIV
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