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Diode_bridge_based_rectifier_AC_voltmeter

2016-05-14 19:09  
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Diode_bridge_based_rectifier_AC_voltmeter
Figure 4-41 shows a circuit that provides both ac and dc outputs for inputs up to 2.5 MHz, Figure 4-42 shows the waveforms. Trace A shows the input sine wave. traces B and C are the switched corners of the bridge, trace D is the ac output, trace E is an expanded version of trace D, To calibrate, apply a 1-MHz to 2-MHz 1-V p-p sine wave and adjust the delay compensation so that bridge switching Occurs when the sine crosses zero. This adjustment corrects for the small delays through the LT1016 and the level shifters. Next, adjust the skew-compensation pots for minimum distortion in the ac output signal(trace D).These trims shift the phase of the rising output edge of their respective level shifter This allows skew in the complementary bridge-drive signals to be kept within 1 ns to 2 ns, minimizing output disturbances when switching Occurs. A 100-mV sine input will produce a clean output with a dc output accuracy of better than 0.25%,LINEAR TECHNOLOGY, APPLICATION Nom 43,P. 34.