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OP177FP bảng dữ liệu(PDF) 10 Page - Analog Devices |
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OP177FP bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 12 page OP177 REV. B –10– BILATERAL CURRENT SOURCE The current sources shown in Figure 28 will supply both positive and negative current into a grounded load. Note that ZO = R5 R4 R2 +1 R5 + R4 R2 – R3 R1 and that for ZO to be infinite, R5 + R4 R2 must = R3 R1 PRECISION ABSOLUTE VALUE AMPLIFIER The high gain and low TCVOS assure accurate operation with inputs from microvolts to volts. In this circuit, the signal always appears as a common-mode signal to the op amps. The OP177E CMRR of 140 dB assures errors of less than 1 ppm. See Figure 29. PRECISION POSITIVE PEAK DETECTOR In Figure 30, the CH must be of polystyrene, Teflon*, or polyethylene to minimize dielectric absorption and leakage. The droop rate is determined by the size of CH and the bias current of the OP41. PRECISION THRESHOLD DETECTOR/AMPLIFIER In Figure 32, when VIN < VTH, amplifier output swings nega- tive, reverse biasing diode D1. VOUT = VTH if RL = ∞. When VIN ≥ V TH, the loop closes, VOUT =VTH + VIN –VTH () 1+ RF RS CC is selected to smooth the response of the loop. *Teflon is a registered trademark of the Dupont Company. Figure 31. Precision Threshold Detector/Amplifier Figure 30. Precision Positive Peak Detector |
Số phần tương tự - OP177FP |
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Mô tả tương tự - OP177FP |
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