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2014-11-23 16:16  
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In this circuit, sensing is done differentially, preserving access to both fast amplifier inputs. A1 measures the dc error at the A2 input, and biases the offset pins to force offset within 50 μV. The offset-pin biasing at A2 is arranged so that A1 is always able to find the servo point. The 0.01-μF capacitors rolls off Al at the low frequency, and A2 handles the high-frequency signals. The combined characteristics yield: gain-bandwidth of 45 MHz, offset voltage of 50 μV, offset drift of 1 μV/℃, and a slew rate of 250 V/μs.