A new sub-1-V bandgap voltage reference is presented in this paper, which has advantages over the prior arts in terms of output noise and compatibility with several fabrication processes. The topology allows the reference to operate with a supply voltage as low as 1 V by employing the reverse bandgap voltage principle (RBVP). It also has an attractive low-noise output without the use of a large external filtering capacitor. The design was fabricated with a 0.5-m BiCMOS process, but it is compatible with most CMOS and BiCMOS fabrication processes. The entire die area is approximately 0.4 mm 2 , including all test pads and dummy devices. Theoretical analysis and experimental results show that the output noise spectral density is 40 nV Hz with a bias current of 20 A. Moreover, the peak-to-peak output noise in the 0.1-10 Hz band is only 4 V. The untrimmed reference has a mean output voltage of 190.9 mV at room temperature, and it has a temperature coefficient in the 40 C to +125 C range of 11 ppm C (mean) with a standard deviation of 5 ppm C.Index Terms-BiCMOS, low noise, low voltage, noise measurement, peak-to-peak noise, sub-1-V bandgap voltage reference, temperature coefficient, 1-V supply.
A sub-i V bandgap voltage reference is presented. The In this paper, a new bandgap voltage reference featuring topology allows the reference to operate with a low voltage supply low output noise without the use of a large external filtering by employing reverse bandgap voltage generation. It also has an capacitor is presented. The circuit architecture is compatible attractive low-noise output without the use of a large external with both CMOS and BiCMOS processes. In Section II, the filtering capacitor. Theoretical analysis and experimental results prior arts of reverse bandgap voltage references are reviewed show the output noise spectral density is 40 nV/
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