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How to increase the BW of the Bipolar log amplifier

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pnanda65675

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For a normal CMOS amplifier, we can play wif the Cap/Res as the F=1/RC. But im quite unsure on how to increase the Bandwitdh of the Bipolar LOg Amplifier. The cct shown can contribute about 100kHz operation. How to alter this circuitry for it to work at higher frequency?
 

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