Analogue-digital converter with low-recoil noise and analogue-digital converter
An analog-to-digital converter technology, applied in the field of analog-to-digital converters, can solve the problems of increasing integrated circuit area, reducing power efficiency, etc., and achieve the effect of avoiding signal distortion and reducing kickback noise
Inactive Publication Date: 2014-03-26
ALI CORP
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Problems solved by technology
Therefore, when the number of conversion circuits in the pipeline analog-to-digital converter increases, the number of redundant circuits also increases, which easily reduces the overall power efficiency and increases the area of the integrated circuit.
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[0062] Image 6 It is a schematic diagram showing each stage conversion circuit 600 in the pipeline analog-to-digital converter according to an embodiment of the present invention. The conversion circuit 600 includes a secondary DAC 610 and a multiple DAC 620 . The secondary analog-digital converter 610 includes a comparator 630 and a comparator 640, and the multiple digital-analog converter 620 includes three switches SW1, SW2 and SW3, two capacitors C5 and C6, an amplifier 650 and a multiplexer (multiplexer, MUX) 660. In the secondary analog-to-digital converter 610, the comparators 630 and 640 will compare the analog signal An-1 from the previous conversion circuit with the reference voltage V REF1 and V REF2 and compare them to obtain a digital signal Dn. Next, in the multiplex digital-to-analog converter 620, the multiplexer 660 will select the reference voltage V according to the digital signal Dn REFN , ground signal "0" and reference voltage V REFP One of them is...
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The invention provides an analogue-digital (A / D) converter with low-recoil noise and a secondary A / D converter. A first comparator produces a first output signal at a first output end according to an input signal and a first reference voltage, and comprises a first N-type input transistor for receiving a first signal and a second N-type input transistor for receiving a second signal, wherein the first signal and the second signal are a differential signal pair for forming the input signal. A second comparator produces a second output signal at a second output end according to the input signal and the second reference voltage, and comprises a first P-type input transistor for receiving the first signal and a second P-type input transistor for receiving the second signal. The A / D converter described by the embodiment of the invention can be applied to the analogue-digital conversion of any electronic product, and can reduce the recoil noise without adding extra circuit so as to avoid signal distortion.
Description
technical field [0001] The present invention relates to an analog-to-digital converter, and more particularly to an analog-to-digital converter with low kickback noise. Background technique [0002] Analog to Digital Conversion (Analog to Digital Conversion) technology has been widely used in different electronic products, among which Pipelined Analog to Digital Converter (pipelined ADC) has the characteristics of high speed and high resolution, so it is often used in in the communication system. [0003] figure 1 is a schematic diagram showing the pipelined ADC 100 . The pipeline analog-to-digital converter 100 includes a sample-and-hold circuit 110 , a conversion module 140 and a digital correction circuit 130 . The conversion module 140 includes n-level conversion circuits 120a-120n and a back-end flash analog-to-digital converter (FlashADC) 125, wherein the n-level conversion circuits 120a-120n are connected in series and the flash-type analog-to-digital converter 125...
Claims
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IPC IPC(8): H03M1/12
Inventor 蔡志厚
Owner ALI CORP