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A Low power Amplitude Shift Keying (ASK) demodulator circuit for passive UHF Radio Frequency Identification (RFID) tag is designed in this paper with several area-saving techniques. Current source is employed to realize the envelop detector instead of resistor to reduce the area. Differential circuit is inserted into the demodulator to enhance the performance of demodulation. Diode-connected PMOS...
ESD failure of an operational amplifier in submicron CMOS technology is analyzed to locate the failure mechanism and re-design the protection structure in this paper. From the experimental results, the specifications related to the output stage with large size devices are degraded or exceed the qualified range. With the deep analysis of internal circuit of the chip, electrical measurement determines...
A video multiplexer with high isolation switch and capability of driving load as low as 75Ω is presented in this paper. The switch consists of a pair of NMOS and PMOS with the noise-shunt path to improve the isolation performance, presenting low on-resistance. The amplifier operates in closed-loop condition for signal buffering or amplification typically, whose circuit design and layout floorplan...
An input stage using Darlington configuration with a lateral PNP and a vertical PNP combination for operational amplifier (Op-Amp) is presented in this paper. The emitter degeneration resistors are added to enhance the slew rate of the amplifier. To decrease the input offset voltage, the base current traced compensation technique is used to balance and compensate the different current component between...
In this paper, a low power, high density and fully integrated CMOS receiver front-end with digital output for optical signal processing systems is presented. The circuit is composed of transimpedance amplifier for weak optical current detection, limiting amplifier for both linear and limiting amplifications, control circuits and the digital output interface. The front-end is powered by a single 3...
In this paper, a monolithic signal conditioner for inductive proximity sensors (IPSs) is presented. It's based on the principle that change in inductance current slew rate at a constant voltage is related to inductance. Through detection of current slew rate slope di/dt, inductance can be detected. This method allows long distance between the conditioner circuits and the proximity sensor, which expands...
In this paper, a 4-channel photocurrent detector is described which is used in the field of photoelectric detection. Each channel of the detector consists of TIAs and voltage comparator, and current detection threshold can be set by external voltage. The TIA has measured 1.5mA input current overload capacity and 1.9 nArms equivalent input noise current level. The detector is processed in 2 um all-NPN...
In this study, a monolithic optoelectronic integrated circuit (OEIC), in which a photodiode detector and a bipolar integrated circuit for reception and amplification are integrated on the same silicon substrate, is described. With the new process technology, the layout of optical and electronic devices is designed, and the processes of optical and electronic devices are run. Thus a good way of developing...
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