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TSH93IDT Datasheet(PDF) 8 Page - STMicroelectronics |
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TSH93IDT Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 13 page Printed circuit layout TSH93 8/13 4 Printed circuit layout As for any high frequency device, a few rules must be observed when designing the PCB to get the best performance from this high speed op-amp. From the most important to the least important point: ● Each power supply lead must be bypassed to ground with a 10nF ceramic capacitor very close to the device and a 10 μF capacitor. ● To provide low inductance and low resistance common return, use a ground plane or common point return for power and signal. ● All leads must be wide and as short as possible especially for op-amp inputs. This is in order to decrease parasitic capacitance and inductance. ● Use small resistor values to decrease the time constant with parasitic capacitance. ● Choose component sizes as small as possible (SMD). On output, decrease capacitor load to avoid degradation in circuit stability which may cause oscillation. You can also add a serial resistor in order to minimize its influence. Figure 12. Differential input impedance vs. frequency Figure 13. Common input impedance vs. frequency 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 1k 10k 100k 1M 10M 100M Frequency (Hz) 1k 10k 100k 1M 10M 100M Frequency (Hz) 120 100 80 60 40 20 |
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