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

V_OUT= (V_BE1 + I₁R₁) = (V_BE1 + I₂R₂)

V_OUT = V_BE1 + R₂(V_BE1 ˆ’ V_BE2/ R₃)

Assume that I₁ is to be made equal to 200 µA, and that (V_BE1 ˆ’ V_BE2) is to be made equal to 100 mV. Determine R₁, R₂, and R₃ to realize zero TC_F of V_OUT at 25 °C. Neglect base currents.

Fig. 4.46 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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Question Posted: Sep 29, 2018 08:50 AM

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

Question:

R1 12 R2 R3 VOUT Q2 (c)

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For zero T CF of V OUT at 25 C We require V OUT 1262 V V OUT V BE1 ...View the full answer

Analysis and Design of Analog Integrated Circuits

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