Mayank
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Typical BGR core consists of a normal ΔVBE + VT*ln(n) compensation. or in other words, VBE1 = VBE2 + Iptat*R.
Typical Current Reference Core, includes extra Resistance arms connected in parallel with the branches of a BGR core to provide CTAT current, which then adds up with PTAT current generated by the BGR core, thus providing ZTC current.
Pls. Refer Voltage References by Gabriel Rincon Moora.
--M
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