Analog-to-digital conversion circuit
An analog-to-digital conversion circuit and circuit technology, applied in the direction of analog-to-digital converters, can solve the problem of low conversion speed and achieve the effect of improving the conversion speed
Inactive Publication Date: 2016-12-14
FU TAI HUA IND SHENZHEN +1
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Problems solved by technology
However, the double-integral analog-to-digital conversion circuit needs to integrate twice during the conversion process, and the conversion speed is not high.
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[0011] see figure 1 , is a block diagram of the analog-to-digital conversion circuit 1 in a preferred embodiment of the present invention. The analog-to-digital conversion circuit 1 includes a control unit 10 , a control switch 20 , a reference voltage generating circuit 30 , an integrating circuit 40 , a comparing circuit 50 and an analog signal input terminal 60 . The control unit 10 includes a control port 101 and a counter 102 . The control unit 10 is connected to the control switch 20 through the control port 101, through which the control port 101 outputs a corresponding control signal to control the on or off of the control switch 20, and the counter 102 controls the control switch at the control port 101. 20 starts counting when the control signal is cut off. The reference voltage generation circuit 30 is used to generate a reference voltage. The integration circuit 40 enters the preparation state for performing the integration action when the control switch 20 is tu...
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An analog-to-digital conversion circuit includes a reference voltage generating circuit, a control switch, a control unit, an integrating circuit and a comparing circuit. The analog signal input terminal is used for inputting an analog signal. The reference voltage generation circuit is used to generate a reference voltage. The control unit includes a counter, and the counter starts counting when the control unit controls the control switch to be turned off. When the control switch is cut off, the integrating circuit outputs a voltage which is continuously rising on the basis of the reference voltage. The comparison circuit compares the analog signal input by the analog signal input end with the voltage output by the integration circuit, and when the voltage output by the integration circuit reaches the voltage of the analog signal input by the analog signal input end, an interrupt signal is generated to The counter makes the counter stop counting, and the count value is the digital value corresponding to the analog signal. The analog-to-digital conversion circuit of the present invention can realize analog-to-digital conversion only by performing one integration, thereby improving the conversion speed.
Description
technical field [0001] The invention relates to an analog-to-digital conversion circuit. Background technique [0002] Most of the current analog-to-digital conversion circuits adopt the double integral type, and the analog-to-digital conversion realized by the integral circuit has the characteristics of strong anti-interference ability and high conversion precision. However, the double-integration analog-to-digital conversion circuit needs to perform two integrations during the conversion process, and the conversion speed is not high. Contents of the invention [0003] In view of this, a single-integration analog-to-digital conversion circuit is provided, which can improve the conversion speed while retaining the characteristics of strong anti-interference ability and high conversion precision. [0004] An analog-to-digital conversion circuit includes an analog signal input terminal, a reference voltage generating circuit, a control switch, a control unit, an integrating...
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IPC IPC(8): H03M1/12
Inventor 余启隆张军庄宗仁翁世芳
Owner FU TAI HUA IND SHENZHEN