Reading circuit and reading method for high-density single-photon avalanche diode (SPAD) array-level analog signals
A technology for reading out circuits and analog signals, which is applied in TVs, electrical components, color TVs, etc., to achieve the effects of reducing noise, facilitating overall reset, and convenient partial reset
Active Publication Date: 2017-05-10
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 22 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The technical problem to be solved by the present invention is to reduce the proportion of the area occupied by the digital circuit in the pixel unit, reduce the noise, and improve the readout of the single photon avalanche diode detector array-level analog signal
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] The specific implementation of the present invention will be further described in detail in conjunction with the accompanying drawings.
[0026] The present invention proposes a readout circuit architecture and method for high-density SPAD array-level analog signals. The readout method is parallel readout. Noise can be eliminated through correlated double sampling technology, and regular read pixels can be easily implemented. Unit performs partial reset
[0027] The pixel unit array is suitable for large-scale analog counting to the peripheral array-level readout circuit, and can reduce the noise generated by analog readout and improve the detection accuracy of the detector. The SPAD array architecture proposed by the present invention, such as figure 1 shown. It mainly reads out the pixel units in the array by row and converts the output analog signal into a digital signal through denoising, external decoding and other steps for long-distance transmission. The reado...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a reading circuit and a reading method for high-density single-photon avalanche diode (SPAD) array-level analog signals. The circuit comprises a Gray code generator, a 3-8 address decoder, a row address decoder, a row partial reset control circuit, a multiplexer, correlated double sampling circuits, an analog-digital converter, a clock and a plurality of pixel units. The Gray code generator provides counting signals for the row address decoder, the 3-8 address decoder and the multiplexer; the row address decoder is controlled by a Gray code and outputs to gate the certain row to perform operation on the same; and an overall reset signal, a partial reset signal and the output end of the row address decoder are connected with a row partial reset control circuit. Eight rows of input signals are sequentially selectively output to the correlated double sampling circuits by the multiplexer, a three-bit gating signal provided by the Gray code generator is connected with the same control signal as the multiplexer when reading, and partial reset can be performed by matching with the row partial reset control circuit. According to the circuit and the method provided by the invention, chip area can be greatly reduced, and noise can be reduced.
Description
technical field [0001] The invention relates to a readout circuit and a readout method of an array-level analog signal of a single-photon avalanche diode detector based on an analog photon counting technology, and belongs to the field of optoelectronic technology. Background technique [0002] Single-photon avalanche diode (Single-Photon Avalanche Diode, SPAD) detection devices have high sensitivity and high time precision resolution, and have been widely used in biomedicine, military and optical communication and other fields. The SPAD device is already compatible with the CMOS process. In order to realize the high integration of the single photon detector, it is necessary to reduce the size and power consumption of the circuit. The traditional SPAD detector pixel unit includes a single photon avalanche diode, quenching and reset circuit, digital counting circuit, latch and related auxiliary circuits. However, as the density of the array continues to increase, due to the wi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H04N5/357H04N5/378
CPCH04N25/60H04N25/75
Inventor 徐跃罗瑞明李斌李鼎赵庭晨
Owner NANJING UNIV OF POSTS & TELECOMM