PQBox100 Power Network Analyzer Driver

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Noise Figure Analyzers + Noise Sources; LCR Meters + Impedance Measurement Products; High-Speed Digitizers + Multichannel Data Acquisition Solutions; AC Power Analyzers; DC Power Analyzers; Dynamic Signal Analyzers, Materials Measurement; Device Current Waveform Analyzers; Parameter + Device Analyzers, Curve Tracer; Picoammeters, Electrometers. The analyzer input-A and input-B are connected together at one point on the DUT board near the LDO supply input. Set the analyzer to calibration mode and sweep over the frequency range (i.e. 100Hz to 100kHz) to be measured. Save the calibration data for later use. Refer the network analyzer manual for detailed calibration setup.

Figure 2 shows the LDO power supply rejection ratio measurement setup. Using a network analyzer, the source is connected to the TS200 modulation input. The TS200 DC and AC output is connected to the LDO supply input. It is recommended to reduce the LDO input capacitance to minimum. Since the TS200 can drive heavy load, thus the LDO output can be loaded with the desired loading resistor (i.e. maximum specified load).


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Set the TS200 modulation input to AC-coupled. Adjust the DC Offset knob until the output DC voltage reaches the desired voltage (i.e. 3.3V). Typically for PSRR testing, the supply ripple amplitude is 200mVpp. If you are using the A-version, set the network analyzer output to 200mV. If you are using the B-version and consider the modulation gain is 20dB, set the analyzer output amplitude to 20mVpp.


First the analyzer and the TS200 need to be calibrated. Figure 2a shows the calibration setup. The analyzer input-A and input-B are connected together at one point on the DUT board near the LDO supply input. Set the analyzer to calibration mode and sweep over the frequency range (i.e. 100Hz to 100kHz) to be measured. Save the calibration data for later use. Refer the network analyzer manual for detailed calibration setup.


After calibration, LDO PSRR measurement setup is shown Figure 2b. The network analyzer input-B is moved to the LDO output near the capacitor while keeping input-A at the LDO input. Again sweep the analyzer over the desired frequency range. You may refer to the analyzer manual for details. After subtracting the calibration data, PSRR data is plotted. Figure 3 shows an example of PSRR plot. Table 1 shows a list of network analyzers can be use with TS200.

PQBox100

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Power analyzers can be used to measure the flow of energy in either alternating current (AC) or direct current (DC) systems – with distinct considerations for measuring AC circuits.

The determination of an electrical signal’s True RMS time period underlines each of the subsequent calculations performed by the measuring instrument. This is complicated by AC measurements, where root mean square is typically expressed as an equivalent DC value. To accurately determine the True RMS of an AC waveform, an average must be calculated across the cycle of the AC frequency. This is defined as the fundamental frequency of the circuit. Power analyzers can digitally detect frequency cycles to provide reliable RMS periods during power conversion.

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A power analyzer must also detect the voltage and current of the system. Typical systems directly acquire individual voltages using voltage dividers, while a transformer is usually required to measure the current. This may comprise a coil that measures the electrical field of a wire carrying a current, or a flux gate current transducer.

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Once the power analyzer has determined each of these values, calculating power is a matter of simple mathematics.