Fast_differential_comparator_amplifier_with_adjustable_offset

Published:2009/7/24 20:57:00 Author:Jessie | From:SeekIC

Figure 5-21 shows a circuit that permits one particular portion of a signal to be amplified (or examined) with all other portions rejected. Figure 5-22 shows what happens when the output of a triangle-wave generator (trace A) is applied to the circuit. Setting the bias level just below the triangle peak permits high-gain, detailed observation of the turnaround at the peak. Switching residue in the generator output is observable in trace B. Appropriate variations in voltage-source setting will permit more of the triangle slopes to be observed, (with a loss of resolution because of scope-overload). Similarly, increasing the A2 gain allows more amplitude detail, while placing restrictions on how much of the waveform can be displayed. In effect, this circuit performs the same functions as differential plug-in units for scopes. The circuit output is accurate and settled to 0.1% about 100 ns after entering the linear region. LINEAR TECHNOLOGY, APPLICATION NOTE 47, P. 39, 40.



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