Abstract
By using 0.35-um CMOS process, this work achieves a design of analogous band-gap reference voltage circuit with low temperature coefficient. The proposed circuit operates at 3V and generates a reference current of 44 uA. The HSPICE simulation results show the temperature coefficient of this circuit is 23 ppm/°C at range of -10 °C to 100 °C, and the line regulation (the ratio of output current variation to supply voltage variation) is estimated as 1.95 uA/V from supply voltage variation of 3 V to 5 V. The experimental chip is fabricated and measured. The circuit provides adjustable capability for output voltage among temperature variation of -10 - 100 °C. The chip area is 534 × 695 um2. In this new design, the operational amplifier is not necessary. The chip design effort can be great reduced.
Highlights
Because of the convenience and portability, more portable consumer electronic devices are frequently used today
The voltage reference circuit currently has been widely used in analog circuit, digital circuit and mixed-signal circuit, such as operational amplifiers, analog-to-digital converters (ADC), digitalto-analog converters (DAC), phase locked loop (PLL) circuits and power regulators
We try to generate the current with positive temperature coefficient and a counterpart current with negative temperature coefficient
Summary
Because of the convenience and portability, more portable consumer electronic devices are frequently used today. The bootstrapping circuit makes the potential voltage of nodes ‘a’ and node ‘b’ as equal as possible, to reduce the effects of channel length modulation and supply voltage variation. It uses emitterbase voltage difference between two bipolar junction transistors (BJTs) to generate a positive temperature coefficient (PTC) current. The voltage drop VRL is added to VEB of BJT with negative temperature coefficient to generate a stable reference voltage output. The temperature coefficient of basic scheme is a little bit large Another conventional bandgap reference voltage circuit is shown in Fig..
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