PiezoDrive PD200X4-V0,100, Manual And Specifications

Page: 13 / 18

PD200X4 V2 Manual 13 Modified 13/01/2021
12 Noise
The output noise contains a low frequency component (0.03 Hz to 20 Hz) that is independent of the
load capacitance; and a high frequency (20 Hz to 1 MHz) component that is approximately inversely
proportional to the load capacitance.
The noise is measured with a preamplifier with a gain of 1000, an oscilloscope, and Agilent 34461A
Voltmeter. The low-frequency noise is plotted in Figure 7. The RMS value is 650 uV with a peak-to-
peak voltage of 4.3 mV.
Figure 7. Low frequency noise from 0.03 Hz to 20 Hz
The high frequency noise (20 Hz to 1 MHz) is listed in the table below versus load capacitance. The
total RMS noise from 0.03 Hz to 1 MHz is found by summing the RMS values, that is
𝜎 = √𝜎
𝐿𝐹
2
+ 𝜎
𝐻𝐹
2
.
Load Cap. Bandwidth HF Noise RMS
Total Noise
RMS
No Load 684 kHz 1.60 mV 1.72 mV
10 nF 759 kHz 1.65 mV 1.77 mV
30 nF 720 kHz 1.75 mV 1.86 mV
100 nF 388 kHz 2.08 mV 2.17 mV
300 nF 172 kHz 2.18 mV 2.27 mV
1 uF 60 kHz 998 uV 1.19 mV
3 uF 21 kHz 414 uV 771 uV
10 uF 6.4 kHz 295 uV 714 uV
30 uF 2.4 kHz 280 uV 708 uV
110 uF 940 Hz 264 uV 702 uV
Table 6. RMS noise versus load capacitance (0.03 Hz to 1 MHz)