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sense clamp

Question asked by DeanW on Jun 17, 2011
Latest reply on Jun 20, 2011 by DeanW

Dear Analog Devices,


I'm using the AD8276 difference amplifier in a single-supply (+12V), non-inverting, gain of two circuit.  The +In and Vref pins are connected in low frequency positive voltage signals.  The -In is grounded and Vsen connected to the emitter of a NPN follower transistor.  The output drives the base of a 2N2222 type transistor thru a ~1k ohm series resistor. The 'boost' transitor does not appear to be driven correctly under low ohm load (~50 ohms) conditions.  My question is as follows: Is the 'sense' pin clamped to the 'output' pin in the AD8276 difference amplifier?