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STAR1000 bảng dữ liệu(PDF) 8 Page - Cypress Semiconductor |
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STAR1000 bảng dữ liệu(HTML) 8 Page - Cypress Semiconductor |
8 / 24 page STAR1000 Document Number: 38-05714 Rev. *F Page 8 of 24 Architecture Floor Plan Figure 3. STAR1000 Floor Plan The image sensor contains five sections: the pixel array, the X- and Y- addressing logic, the column amplifiers, the output amplifier and the ADC. Figure 3 shows an outline diagram of the sensor, including an indication of the main control signals. The following paragraphs explain the function and operation of the different imager parts in detail. Pixel Array The pixel array contains 1024 by 1024 active pixels at 15 μm pitch. Each pixel contains one photo diode and three transistors (Figure 4). The photo diode is always in reverse bias. At the beginning of the integration cycle, a pulse is applied to the reset line (gate of T1) bringing the cathode of D1 to the reset voltage level. During the integration period, photon-generated electrons accumulate on the diode capacitance reducing the voltage on the gate of T2. The real illumination dependent signal is the difference between the reset level and the output level after integration. This difference is created in the column amplifiers. T2 acts as a source follower and T3 allows connection of the pixel signal (reset level and output level) to the vertical output bus. The reset lines and the read lines of the pixels in a row are connected together to the Y- decoder logic; the outputs of the pixels in a column are connected together to a column amplifier. Figure 4. Architecture of the 3T Pixel Reset Reset_DS Vref Ld_Y A0....A9 Y Address Decoder and Logic Pixel Array 1024 x 1024 pixels 1024 Rst 1024 Rd 10 Rst Rd Col 10-bit ADC 10 D0...D9 Clk_ADC Ain S R Column Amplifiers 1024 1024 1024 10 10 1024 1024 Clk_X Ld_X X Register X Address Decoder Rst Sig Progr. Gain Amplifier Buffer Aout T1 T2 T3 Read Reset [+] Feedback |
Số phần tương tự - STAR1000 |
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Mô tả tương tự - STAR1000 |
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