PiezoDrive PX200, Manual And Specifications

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PX200 V5 Manual 10 13/05/2022
9 Noise
The output voltage 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 an SR560 low-noise amplifier (Gain = 1000), oscilloscope, and Agilent
34461A Voltmeter. The low-frequency noise is plotted in Figure 3. The RMS value is 120 uV with a
peak-to-peak voltage of 600 uV.
Figure 3. 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
.
For a load capacitance of less than 1 uF, the noise is primarily broadband thermal noise; however, for
a capacitance of greater than 1 uF, the noise is primarily due to low-frequency noise.
Load Bandwidth HF Noise RMS Total Noise RMS
10 nF 393 kHz 530 uV 543 uV
30 nF 431 kHz 586 uV 598 uV
100 nF 367 kHz 689 uV 699 uV
300 nF 208 kHz 452 uV 468 uV
1 uF 88 kHz 261 uV 287 uV
3 uF 30 kHz 106 uV 160 uV
10 uF 9.3 kHz 56 uV 132 uV
30 uF 3.7 kHz 52 uV 131 uV
100 uF 1.3 kHz 47 uV 129 uV
Table 5. RMS noise versus load capacitance (0.03 Hz to 1 MHz)