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MIC94310-GYCS Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC94310-GYCS Datasheet(HTML) 2 Page - Micrel Semiconductor |
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2 / 6 page  Micrel, Inc. MIC94310 Evaluation Board February 2012 2 M9999-020912 (408) 944-0800 Power Supply Ripple Rejection (PSRR) Measurements Figure 1 illustrates the frequency response of the MIC94310. PSRR COUT = 1µF -120 -100 -80 -60 -40 -20 0 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 FREQUENCY (Hz) IOUT = 200mA IOUT = 100mA IOUT = 10mA VIN = 2.5V + 40mVpp VOUT = 1.8V 10 100 1K 10K 100K 1M 10M Figure 1. MIC94310 Ripple Blocker ™ Frequency Response For high-frequency measurements (above 1MHz), careful attention must be made to the test set-up configuration as it is easy to introduce noise into the grounds which will give inaccurate measurements as shown in Figure 2. Figure 2. High-Frequency Noise on Measurement System The inductance of test probes connected to the evaluation board at higher frequencies becomes a factor which can create a differential between the device under test and test measurement system grounds. Adding a low-value resistor (2 Ω) in series with the input capacitor to ground and utilizing a test measurement system capable of making differential measurements will help to reduce these effects. PSRR measurements may be made using either dedicated PSRR test equipment or with a PSRR interface board and a network analyzer. The network analyzer can sweep the AC frequency and perform a comparison measurement of the amplitude on the input and output. With this method, the network analyzer is configured for an A/R measurement. The difficulty arises when trying to impose the network analyzer’s AC signal with the DC input voltage to the MIC94310. The circuit shown in Figure 3 accomplishes this by using the MIC911 as a summing amplifier. The summing amplifier adds the VSUPPLY (DC voltage) and the network analyzers AC signal. As the network analyzers source is 50Ω impedance it may be neglected, the DC voltage seen at the non- inverting side is half of the VSUPPLY voltage. The output is gained up by 2 with the 1kΩ resistor divider to the non-inverting side. This sums the AC and DC voltages with an overall gain of 1. Figure 3. Network Analyzer Set-Up |
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