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OP176GS 데이터시트(PDF) 10 Page - Analog Devices |
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OP176GS 데이터시트(HTML) 10 Page - Analog Devices |
10 / 21 page OP176 REV. 0 –10– Figure 33. Unity Gain Follower Figure 34. Unity Gain Inverter In inverting and noninverting applications, the feedback resistance forms a pole with the source resistance and capaci- tance (R S and CS) and the OP176’s input capacitance (CIN), as shown in Figure 35. With R S and RF in the kΩ range, this pole can create excess phase shift and even oscillation. A small capacitor, C FB, in parallel with RFB eliminates this problem. By setting R S (CS + CIN) = RFB CFB, the effect of the feedback pole is completely removed. Figure 35. Compensating the Feedback Pole Output Voltage Phase Reversal Since the OP176’s input stage combines bipolar transistors for low noise and p-channel JFETs for high speed performance, the output voltage of the OP176 may exhibit phase reversal if either of its inputs exceeds the specified negative common-mode input voltage. This might occur in some applications where a trans- ducer, or a system, fault might apply very large voltages upon the inputs of the OP176. Even though the input voltage range of the OP176 is ±10.5 V, an input voltage of approximately –13.5 V will cause output voltage phase reversal. In inverting amplifier configurations, the OP176’s internal 7.5 V clamping diodes will prevent phase reversal; however, they will not prevent this effect from occurring in noninverting applications. For these applications, the fix is a 3.92 k Ω resistor in series with the noninverting input of the device and is illustrated in Figure 31. Figure 31. Output Voltage Phase Reversal Fix Overdrive Recovery The overdrive recovery time of an operational amplifier is the time required for the output voltage to recover to a rated output level from a saturated condition. This recovery time is impor- tant in applications where the amplifier must recover quickly after a large abnormal transient event. The circuit shown in Figure 32 was used to evaluate the OP176’s overload recovery time. The OP176 takes approximately 1 µs to recover to V OUT = +10 V and approximately 900 ns to recover to V OUT = –10 V. Figure 32. Overload Recovery Time Test Circuit High Speed Operation As with most high speed amplifiers, care should be taken with supply decoupling, lead dress, and component placement. Recommended circuit configurations for inverting and noninverting applications are shown in Figure 33 and Figure 34. VIN RS 909 Ω VOUT RL Ω2.43kΩ R2 Ω10kΩ R1 Ω1kΩ 4Vp-p @ 100Hz 6 2 3 OP176 +15V + 10µF 0.1µF 2 3 7 6 4 VIN VOUT RL 2k Ω –15V 10µF 0.1µF OP176 +15V + 10µF 0.1µF 2 3 7 6 4 VIN VOUT 2k Ω –15V 10µF 0.1µF OP176 10pF 4.99k Ω 2.49k Ω 4.99k Ω + CFB RFB CIN VOUT RS CS ΩR S 3.92k Ω ΩR L 2k Ω RFB* VIN VOUT *RFB IS OPTIONAL OP176 2 3 6 |
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