| Recent research in CMOS integrated noise generators has resulted in the development of components that make possible the design of a high performance linear CMOS bandgap reference with low output noise. The effects of output noise on the performance of previously reported CMOS bandgap references are calculated and compared, and a low noise linear CMOS bandgap reference is proposed, simulated, fabricated, and tested. This circuit uses lateral bipolar transistors as floating p-n diodes and differential input devices to create a low noise bandgap reference with a temperature coefficient comparable to previous CMOS bangap circuits and output noise nearly an order of magnitude lower. The operation and performance of these lateral bipolar transistors and the low noise amplifiers built from them are discussed. A new method of higher-order temperature coefficient compensation for bandgap references is also derived and simulated. |
