Low-power-consumption Radix-4 charge weight distributed type DAC and switching technology

A technology of charge redistribution and low power consumption, applied in the field of DAC and switching, can solve the problems of large circuit area and high switching power consumption, and achieve the effect of reducing switching power consumption, circuit area and capacitance.

Active Publication Date: 2015-06-24
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a low power consumption Radix-4 charge redistribution type DAC and sw

Method used

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  • Low-power-consumption Radix-4 charge weight distributed type DAC and switching technology
  • Low-power-consumption Radix-4 charge weight distributed type DAC and switching technology
  • Low-power-consumption Radix-4 charge weight distributed type DAC and switching technology

Examples

Experimental program
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Effect test

Example Embodiment

[0021] Example one: such as figure 2 As shown, the low-power Radix-4 charge redistribution DAC of this embodiment includes a capacitor array, a reference voltage source, and a switch controlled by a digital signal to turn the reference voltage source and the capacitor on or off. The capacitor The circuit for expressing the weight of each capacitance in the array is a quaternary circuit, and there are three reference voltage sources.

[0022] The DAC is a double-ended DAC with two identical capacitor arrays and a sampling of N bits of information. When N is an odd number, each capacitor array is Effective capacitance and a redundant capacitance C 0 When N is an even number, each capacitor array is composed of Effective capacitance and a redundant capacitance C 0 The effective capacitance is C 1 , C 2 , C 3 ……C n ; Wherein when 1≤i≤n-1 and i is an integer, When i=0, Where C i , C i-1 , C j These are the capacitances of the i-th, i-1 and j-th capacitors.

[0023] The switch is one...

Example Embodiment

[0024] Embodiment two: such as figure 1 As shown, the low-power Radix-4 charge redistribution DAC of this embodiment includes a capacitor array, a reference voltage source, and a switch controlled by a digital signal to turn the reference voltage source and the capacitor on or off. The capacitor The size weight of each capacitor in the array is quaternary, and there are three reference voltage sources.

[0025] The DAC is a single-ended DAC with a capacitor array and a sampling of N bits of information. When N is an odd number, the capacitor array is determined by Effective capacitance and redundant capacitance C 0 When N is an even number, the capacitor array is composed of It consists of two effective capacitors and one redundant capacitor. The effective capacitors are C 1 , C 2 , C 3 ……C n ; Wherein when 1≤i≤n-1 and i is an integer, When i=0, Where C i , C i-1 , C j These are the capacitances of the i-th, i-1 and j-th capacitors.

[0026] The switch is one of four switches, ...

Example Embodiment

[0027] Embodiment 3: The switching technology of the low-power Radix-4 charge redistribution DAC, the switching technology of the double-ended DAC is a common mode level down switching type:

[0028] The initial state of the capacitor array is the redundant capacitor C 0 Connect to GND, other capacitors The switching steps are:

[0029] In the first step, the sampling switch is turned off. From the second step on, if i is an even number, if the i-th step is to switch upwards, the capacitor in the capacitor array at the positive end of the sample will be connected Switch from Switch to If the i-th step is to switch down, connect the capacitor in the capacitor array at the negative end of the sample Switch from Switch to If i is an odd number, if the i-th step is to switch upward, the capacitor in the capacitor array at the positive terminal of the sample will be connected Switch from Switch to GND or from Switch to V ref ; If the i-th step is to switch down, connect the cap...

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Abstract

The invention discloses a low-power-consumption Radix-4 charge weight distributed type DAC and switching technology. The low-power-consumption Radix-4 charge weight distributed type DAC comprises a capacitor array, reference voltage generators and a toggle switch controlled by digital signals for making the reference voltage generators connect or disconnect with capacitors; the weight express circuits showing sizes of various capacitors in the capacitor array are quaternary circuits, and the number of the reference voltage generators is three; the switching technology comprises a common-mode level switchover downward type and a successive approximation method; according to the low-power-consumption Radix-4 charge weight distributed type DAC and the switching technology, the toggle switch is controlled by the digital signals for making the reference voltage generators connect or disconnect with capacitors, so that charges on polar plates of the various capacitors are redistributed, and analog signals are output from an output end; due to that the weights of the sizes of various capacitors in the capacitor array are quaternary, and the number of the reference voltage generators is three, so that digital-to-analogue conversion is achieved through less switching times, the switching power consumption of the DAC is reduced, needed capacitor is less, and thereby the circuit area of the DAC is reduced.

Description

technical field [0001] The invention relates to a DAC and switching technology, in particular to a charge redistribution DAC and switching technology. Background technique [0002] At present, many electronic devices such as wireless sensor nodes and bio-implanted electronic devices require low-power data converters. SAR ADCs have attracted extensive attention and research because of their simple circuit structure and low power consumption. Among them, the DAC is an important part of the SAR ADC, and the switching power consumption of the DAC also accounts for a large proportion of the total power consumption of the SAR ADC. Therefore, researching and designing low-power DAC is an important topic in the field of SAR ADC. [0003] The DAC used for SAR ADC can be realized in many ways, such as current mode DAC, R-2R type DAC, charge redistribution type DAC. Among them, the charge redistribution DAC has zero static power consumption, so most of the current SAR ADCs use the ch...

Claims

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Application Information

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IPC IPC(8): H03M1/66
Inventor 李永福王谦王国兴伏进吴高林李勇朴爱玲籍勇亮耿文良李龙徐巍杨雁彭华东
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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