Design of a High-precision Low-noise Bandgap Voltage Reference
Liu Su · 2011
A new low-voltage low-noise voltage reference independent of temperature is presented by employing the reverse bandgap voltage principle(RBVP) and based on subthreshold MOSFETs.Without the use of a large external filtering capacitor the topology has a low-noise output due to the large output impedance of bipolar transistor.Hspice results show that the nominal output is 233.9 mV,the temperature coefficient is 7.6×10-6/°C for 0.95 V supply voltage and the output noise spectral density of 15 nV/Hz at 30 Hz can be obtained.The reference voltage variation is 1.7 mV for supply voltage from 0.9 V to 2.0 V at room temperature.The chip measurement demonstrates the proposed voltage reference circuit may operate with a supply voltage as low as 1 V and has lower noise,temperature coefficient and power dissipation.