| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 100 === This thesis proposes a new dual-band readout circuit with variable integration time and builds a wireless image sensor network. The hybrid type pixel architecture of DI (Direct Injection) and CTIA (Capacitive Transimpedance Amplifier) is adopted in the readout circuit. The integration time and readout mode are controlled by the external pins. Direction Injection with the features of higher impedance and low-power consumption is suitable for high sensing photocurrent. Capacitive transimpedance amplifier has the characteristics of high linearity and noise immunity, which is applied to low sensing photocurrent. The transportation protocol of the wireless image sensor network is using Zigbee, that has the superiorities of low-power and ad-hoc network. The system can display sensing image in real-time, and it supports remote control integration time and image correction.
The readout chip is achieved by using TSMC 0.35um 2P4M COMS 5V process. The layout area of unit pixel circuit is 40um x 40um. The input photocurrent range of CTIA is 0.11pA ~ 10nA and DI is 3.3pA ~ 153nA. The chip can operate at 2 kHz ~ 4 MHz. The output swing is 2.08V, the dynamic range is 46dB, the power consumption is 9.3 mW and the max pixel rate is 12 MHz.
The wireless image sensor network employs Arduino Duemilanove as the sensor node processor. The antenna is adopted XBee and the man-machine interface of the receiver is built by LabVIEW. The max transmission rate is 115200 bps. The grayscale images have a maximum color depth of 8 bits.
|
|---|
