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AD637JR-REEL Folha de dados(PDF) 9 Page - Analog Devices |
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AD637JR-REEL Folha de dados(HTML) 9 Page - Analog Devices |
9 / 10 page REV. E –9– AD637 VECTOR SUMMATION Vector summation can be accomplished through the use of two AD637s as shown in Figure 16. Here the averaging capacitors are omitted (nominal 100 pF capacitors are used to insure stability of the filter amplifier), and the outputs are summed as shown. The output of the circuit is VO = V X 2 +V Y 2 This concept can be expanded to include additional terms by feeding the signal from Pin 9 of each additional AD637 through a 10 k Ω resistor to the summing junction of the AD711, and ty- ing all of the denominator inputs (Pin 6) together. If CAV is added to IC1 in this configuration, the output is V X 2 +V Y 2 . If the averaging capacitor is included on both IC1 and IC2, the output will be V X 2 +V Y 2 . This circuit has a dynamic range of 10 V to 10 mV and is lim- ited only by the 0.5 mV offset voltage of the AD637. The useful bandwidth is 100 kHz. BUFFER AD637 SQUARER/DIVIDER BIAS SECTION FILTER 25k 25k 1 2 3 4 5 6 7 14 13 12 11 10 9 8 CAV –VS +VS + ABSOLUTE VALUE NC SIGNAL INPUT NC 100 F AD548JN –VS +VS FILTERED V rms OUTPUT 1 F 1 F 1000pF 6.8M NOTE: VALUES CHOSEN TO GIVE 0.1% AVERAGING ERROR @ 1Hz 1M 50k –VS +VS OUTPUT OFFSET ADJUST CAV1 3.3 F 499k 1% R 3.3M 3.3M VIN 2 V rms Figure 15. AD637 as a Low Frequency RMS Converter BUFFER AD637 SQUARER/DIVIDER BIAS SECTION FILTER 25k 25k 1 2 3 4 5 6 7 14 13 12 11 10 9 8 –VS +VS ABSOLUTE VALUE 100pF VX IN BUFFER AD637 SQUARER/DIVIDER BIAS SECTION FILTER 25k 25k 1 2 3 4 5 6 7 14 13 12 11 10 9 8 –VS +VS ABSOLUTE VALUE 100pF VX IN VOUT = VX2 + VV2 5pF 10k AD711K EXPANDABLE 10k 10k 20k Figure 16. AD637 Vector Sum Configuration |
Nº de peça semelhante - AD637JR-REEL |
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Descrição semelhante - AD637JR-REEL |
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