Lowpower Bandgap Reference with Soft Startup for Energy Scavenging Applications Bandgap reference (BGR) is one of the important and indispensable analog circuits in integrated circuits. The design of BGR has been widely known. In most cases, the power supply voltage is assumed to be a constant value with a variation of xc2xb110%. However, in the case of energy scavenging, the input voltage, which will be converted to the power supply voltage, varies in a wide range. Linear regulator such as Low DropOut Regulator (LDO) is used to produce the power supply inside the chip, however, the BGR cannot use LDO output as it power supply voltage since LDO uses BGR output as its reference voltage. In near field communication (NFC) systems, the input voltage varies with the distance between the reader and device. This work assumes the implementation of BGR in an NFC system where the supply voltage of BGR varies from OV to  5mathrmV . A BGR startup mechanism for a wide input voltage range is proposed. The proposed startup mechanism is implemented in 0.18um CMOS process and verified using Spectre simulation. The proposed BGR operates at 1.355.5V input voltage range. The temperature coefficient at a 1.7V input voltage and a temperature range from xe2x88x9225 to 80xc2xb0C is 21ppmxc2xb0C.

High precision low power CMOS bandgap for RFID In this paper, a low power high precision bandgap reference with a thirdorder temperature compensation and a high slope positivetemperature coefficient voltage are designed using a SMIC 180 nm BiCMOS process. The structure of positive temperature coefficient current and negative temperature coefficient current subtraction are used to obtain a high slope positive temperature coefficient current, which is more convenient for sampling of the rear circuit. The simulation show when the temperature is changed within the range of xe2x88x9225 to 100 xc2xb0C, the temperature coefficient of the output reference voltage is 3.8ppmxc2xb0C, the slope of the PTAT voltage is 5.13mVxc2xb0C the PSRR at low frequency is xe2x88x9262dB. At a power supply voltage of 1.8V, the overall power consumption is 50uW.