analog-to-digital conversion circuit
A technology of analog-to-digital conversion circuit and analog-to-digital conversion unit, which is applied in the direction of analog-to-digital converters, electrical components, and electric pulse generation, and can solve the problem of low precision, complex structure of the time analog-to-digital converter system, and inability to adapt to corresponding mode conversion Devices and other issues, to achieve the effect of a simple overall structure
Active Publication Date: 2017-01-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, time-based analog-to-digital converters still have problems such as complex system structure and low precision, and cannot meet the needs of current corresponding mode converters.
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[0019] Such as figure 1 The analog-to-digital conversion circuit of the present invention shown is a specific 2-bit analog-to-digital converter circuit, comprising: three parallel analog-to-digital conversion units, respectively the first analog-to-digital conversion unit 100, the second analog-to-digital conversion unit 200 and the third analog-to-digital conversion unit 300, each analog-to-digital conversion unit has the same structure. There is also a clock circuit 400, which includes an inverter 401 and an AND gate 402 in the clock circuit 400. The input end of the inverter 401 is the second pulse signal S2', and the output end is connected to an input end of the AND gate 402, and the AND gate The other input end of the gate 402 is connected to the clock signal CLK, and the output end of the AND gate 402 is the first pulse signal S1'.
[0020] Such as figure 2 As shown, taking the first analog-to-digital conversion unit 100 as an example, there is an NMOS transistor 101...
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The present invention relates to an analog-to-digital conversion circuit, comprising at least two parallel analog-to-digital conversion units, each of which has: an NMOS transistor whose gate is connected to an input voltage, and whose source and drain are respectively connected to the first Two ends of a capacitor, wherein the source is grounded, the drain is connected to the power supply through the drain and source of the first PMOS transistor, the gate of the first PMOS transistor is connected to the clock circuit, the drain of the NMOS transistor and the drain of the first PMOS transistor One pole is connected to the gate of the second PMOS transistor through the first inverter, the source of the second PMOS transistor is connected to the power supply, the drain is connected through the resistor and the first switch, and the second switch and the second capacitor connected in parallel with one end grounded The rear output, the first switch and the second switch are controlled by the clock circuit and the opening / closing timings are opposite. The present invention has a simple overall structure, is suitable for single-ended circuits, and does not need internal references and non-overlapping clocks. high-speed analog-to-digital conversion applications.
Description
technical field [0001] The present invention relates to electronic circuits, in particular to analog-to-digital conversion circuits. Background technique [0002] Today's world is a highly information-based society. The ever-changing digital communication technology promotes the rapid development of society. It has become a common choice to use digital signal processing systems for information processing. However, various objects and signals in the real world are analog, so An analog-to-digital converter is needed to convert the analog signal to a digital signal. [0003] The most important parameters of the analog-to-digital converter (ADC) are the conversion accuracy and conversion rate. Usually, the accuracy is expressed by the number of binary digits of the output digital signal, and the rate is expressed by the number of conversions per second. The more digits the converter can accurately output the digital signal, the stronger the ability of the converter to distingui...
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IPC IPC(8): H03M1/12H03K3/012
Inventor 刘洋董华张铎吴霜毅胡绍刚顾野徐艳飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA