CDAC based on equal capacitor array
A technology of capacitor array and switched capacitor array, which is applied in CDAC. field, it can solve the problems of rising cost and large circuit area, and achieve the effect of reducing area, reducing static power consumption, and facilitating matching design
Active Publication Date: 2021-08-06
SUN YAT SEN UNIV
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Problems solved by technology
However, the capacitance required by each bit of the existing CDAC circuit is twice that of the previous bit, often requiring more capacitance to realize its function, resulting in an excessively large circuit area and increased cost
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.
[0026] The invention provides a CDAC based on an equal capacitance array, comprising a sampling switch, a switched capacitor array and a switched resistor array, the sampling switch is connected to the switched capacitor array, the switched capacitor array is connected to the switched resistor array, the switched capacitor The array includes at least two branches and at least one single-pole single-throw switch of the first type, and a capacitor and a single-pole double-throw switch are arranged on the branch, and the...
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The invention discloses a CDAC based on an equal capacitor array, which comprises a sampling switch, a switched capacitor array and a switched resistor array. The sampling switch is connected with the switched capacitor array, the switched capacitor array is connected with the switched resistor array, and the switched capacitor array comprises at least two branches and at least one first-class single-pole single-throw switch. A capacitor and a single-pole double-throw switch are arranged on each branch circuit, an upper pole plate of the capacitor is connected with the single-pole single-throw switch, a lower pole plate of the capacitor is connected with a first end of the single-pole double-throw switch, a second end of the single-pole double-throw switch is connected with the switched resistor array, and a third end of the single-pole double-throw switch is grounded. According to the invention, the area of the circuit can be reduced under the condition that the conversion speed and the SARADC precision are not changed. The invention can be widely applied to the technical field of integrated circuits.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a CDAC based on an equal-capacitance array. Background technique [0002] Charge redistribution digital-to-analog converter (CDAC) is a common circuit structure suitable for successive approximation analog-to-digital converters (SAR ADC). It is an important part of the SAR ADC to complete the binary search algorithm, used to generate each conversion The reference voltage in the SAR ADC system plays the role of sample and hold circuit and digital-to-analog converter. [0003] Among various DAC structures applied to SAR ADC, CDAC has many advantages. Compared with resistors, capacitors have better matching, and the circuit can achieve higher precision; secondly, compared with other structures, charge redistribution DAC has no static power consumption, and can realize ultra-low power consumption ADC design; in addition, The capacitor array can be used as the sampling c...
Claims
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Login to View More IPC IPC(8): H03M1/66
CPCH03M1/664Y02E10/56
Inventor 郭建平陆颢瓒李前
Owner SUN YAT SEN UNIV