A primary and secondary slope analog-to-digital conversion circuit and method
An analog-to-digital conversion circuit and analog-to-digital conversion technology, applied in the direction of analog-to-digital conversion, code conversion, electrical components, etc., can solve the problem of reducing the main clock frequency of the analog-to-digital converter, so as to reduce the design difficulty and reduce power consumption. , the effect of reducing the operating frequency
Active Publication Date: 2019-01-04
苏州睿新微系统技术有限公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is how to reduce the frequency of the master clock of the analog-to-digital converter when the planar array is getting larger, the refresh frame rate is getting faster and faster, and the number of conversion bits is getting more and more
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[0024] figure 1 A schematic diagram of a primary and secondary slope analog-to-digital conversion circuit provided by an embodiment of the present invention.
[0025] refer to figure 1 , the circuit includes a ramp generator 10 , a slope modulator 20 , a high-speed comparator 30 , a counter 40 , a register 50 and a sample-and-hold circuit 60 .
[0026] The slope generator 10 inputs the slope voltage, the output terminal of the slope generator 10 is connected with the input terminal of the slope modulator 20, and the output terminal of the slope modulator 20 is connected with the negative input terminal of the high-speed comparator 30, The input terminal input signal voltage of sample and hold circuit 60, the output terminal of described sample and hold circuit 60 is connected with the forward input terminal of described high-speed comparator 30, and the output terminal of described high-speed comparator 30 is respectively with described slope modulation Device 20 is connecte...
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The invention relates to an analog-to-digital conversion circuit and method for main and secondary gradients. The method comprises: a gradient modulator processes a ramp voltage to generate a main gradient ramp voltage and a secondary gradient ramp voltage; a signal voltage and the main gradient ramp voltage are compared, a value M of a counter is recorded by digital processing, a control signal outputted by a high-speed comparator is sent to the gradient modulator, and the gradient modulator modulates the control signal, wherein the M1 is a binary number; and the signal voltage is compared with the secondary gradient ramp voltage and a value M2 of the counter is recorded by digital processing, wherein the M2 is a binary number; and according to the M1 and the M2, a digital output value M is obtained, wherein the M is a binary number.
Description
technical field [0001] The invention relates to the field of analog-to-digital conversion circuits, in particular to a primary and secondary slope analog-to-digital conversion circuit and method. Background technique [0002] The analog-to-digital converter is a key component of the infrared imaging system. It is a key part that connects the analog channel of the readout circuit and the subsequent signal processing. The performance of the analog-to-digital converter directly affects the performance of the entire focal plane array readout circuit. The on-chip integrated Analog-to-digital converters have become a trend in the design of readout circuits. [0003] The analog-to-digital converters generally used in infrared imaging systems can be divided into three types: chip-level, column-parallel, and pixel-level. Chip level means that the entire pixel array shares an analog-to-digital converter, and the pixel signal is sent to the input end of the analog-to-digital converter...
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IPC IPC(8): H03M1/56
CPCH03M1/56
Inventor 李聪科俞白军
Owner 苏州睿新微系统技术有限公司