A high-precision analog counter circuit with adjustable step size and its measurement method
A high-precision, counter technology, applied in the field of single-photon detection, can solve the problems of large area occupied and disadvantageous high-density imaging arrays, etc., and achieve the effects of low manufacturing cost, simple structure and complete manufacturing process.
Active Publication Date: 2020-10-13
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Counters include digital counters and analog counters. Digital counters are generally composed of multiple D flip-flops, which occupy a large area and are not conducive to realizing high-density imaging arrays.
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
specific Embodiment
[0040] The present invention simulates the above-mentioned high-precision analog voltage counter circuit with adjustable step size applied to the single photon detector based on the standard 0.18 μm CMOS process. The photon signal Photon is set as the pulse width of 200ns, and the cycle is a pulse signal of 2us, and the cycle of the reset signal Rst is 1.024ms; Figure 4 The simulation results shown in Fig. The abscissa in the figure is the simulation time, and the ordinate is the voltage value at the output terminal. Depend on Figure 4 It can be seen that when the counting start signal Start and the counting end signal Stop are both at low level, the analog counter enters the counting phase. Whenever a photon arrives, the gate and source voltages of MP5 are the power supply VDD. When the photon leaves, MP5 is turned on, generating a conduction current to charge the counting capacitor C2, and the voltage at VA rises by a fixed step V step , the voltage value V at VA C2It ...
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 high-precision analog counter circuit with an adjustable step length, which belongs to the technical field of single photon detection and comprises a logic control unit, a counting unit, a voltage holding unit and a reading unit. The output end of the logic control unit is connected with the input end of the counting unit, the output end of the counting unit is connectedwith the input end of the voltage holding unit, and the output end of the voltage holding unit is connected with the input end of the reading unit. The invention further discloses a measuring method of the high-precision analog counter circuit, the logic control unit generates an effective photon counting signal input to enable the counting unit to work, the counting range of the counting unit iscontrolled through external reference voltage Vref, and the resolution of 7 bits, 8 bits and 9 bits can be reliably achieved. The circuit structure is simple, the circuit area is small, and the circuit density and integration are increased; the output swing of the circuit is large, high resolution can be realized, and the imaging reliability is enhanced; in addition, the counter has good linearityand retention performance.
Description
technical field [0001] The invention belongs to the technical field of single photon detection, and in particular relates to a high-precision analog counter circuit with adjustable step length and a measurement method thereof. Background technique [0002] Single-photon avalanche diode (Single-Photon Avalanche Diode, SPAD) has been gradually applied in bioluminescence lifetime imaging (FluorescenceLifetime Imaging microscopy, FLIM) and photon time of flight (Time of Flight, TOF) measurement. [0003] Time-Correlated Single Photon Counting (TCSPC) and Gated-Window Method (Gated-Window Method, GW) are the two main methods of fluorescence lifetime imaging. Time-to-Digital Converter (Time-to-Digital Converter) , TDC) are the main methods of TOF measurement, and these methods all need to count the photons arriving within a specific time period. [0004] Counters include digital counters and analog counters. Digital counters are generally composed of multiple D flip-flops, which...
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 Patent Type & Authority Patents(China)
IPC IPC(8): H03K21/10G01J11/00
CPCG01J11/00H03K21/10
Inventor 朱思慧徐跃
Owner NANJING UNIV OF POSTS & TELECOMM