The circuit of Fig. 4.46c is to be used as a band-gap reference. If the op amp

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The circuit of Fig. 4.46c is to be used as a band-gap reference. If the op amp is ideal, its differential input voltage and current are both zero and

VOUT = (VBE1 + I1R1) = (VBE1 + I2R2)

VOUT = VBE1 + R(VBE1 ˆ’ VBE2 / R3)

Assume that I1 is to be made equal to 200 µA, and that (VBE1 ˆ’ VBE2) is to be made equal to 100 mV. Determine R1, R2, and R3 to realize zero TCF of VOUT at 25 °C. Neglect base currents.

Fig. 4.46 c:

R1 12 R2 R3 VOUT Q2 (c)

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Analysis and Design of Analog Integrated Circuits

ISBN: 978-0470245996

5th edition

Authors: Paul R. Gray, ‎ Paul J. Hurst Stephen H. Lewis, ‎ Robert G. Meyer

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