TOA Electronics THS4130 manual Power Down Verification, Measuring the Frequency Response

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2.5 Power Down Verification

This EVM is used to evaluate devices with and without the shutdown function. Therefore, this step is only applicable if the device has a shutdown function. Please see the data sheet for power-down verification.

1)Insert the jumper JU1 to power down the device. The current consumption

(dc current meters) should drop to less than 1.5 mA. Remember to dis- count the current flow through the 10-kΩ pullup resistor on the EVM when

calculating the device current consumption in the shutdown mode.

2)Turn off the power supply and disconnect the wiring.

3)Turn off the function generator and disconnect the wiring.

4)Basic operation of the operational amplifier and its EVM is complete.

2.6Measuring the Frequency Response

This EVM is designed to easily interface with network analyzers. Jumpers J3 and J4 facilitate the use and insertion of the differential probes at the input and output nodes. It is important to consider the following steps to ensure optimal performance in terms of bandwidth, phase margin, gain, and peaking

1)Connect the power supply according to the power supply set up (section 2.2)

2)Use proper load values. Loads directly effect the performance of the differential operational amplifier (the suggested value is 200 Ω differentially, 100 Ω on each output node).

Caution:

Incorrect connections cause excessive current flow and may damage the device.

3)Place the GND connection of the probe as close as possible to the output nodes. Use the GND holes on the EVM. The GND holes create a shorter route to the GND plane and output nodes.

4)Place the probe at the input nodes, set the power level of the network analyzer to the proper level (information in the data sheet typically is produced at ±20 dBm power level), and calibrate the network analyzer.

Note:

If a differential probe is used, verify that resistors R1a, R1b, R4b, and R4a are in place. The resistors are 0 Ω values providing the path to the differential probe terminals.

5)Place the probe at the output nodes (if a differential probe is used, insert the probe into the provided jumper), and measure the frequency response.

Using the THS4130 EVM

2-5

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Contents Users Guide Important Notice Preface Trademarks Contents Figures Introduction and Description Description Evaluation Module FeaturesSchematic of the Populated Circuit Default Configuration THS4130 EVM Specifications±2. Schematic THS4130 EVM SchematicAdditional Sample Schematics ±5. Vicr Level Shifter ±7. Top Layer Silkscreen THS4130 EVM Layout±9. Internal Plane Layer 2 Ground Plane ±11. Bottom Layer 4 Ground and Signal Introduction and Description Using the THS4130 EVM Required Equipment Power Supply Setup±2. Signal Connections Input and Output Setup±3. Driver 1 Output Signal Testing the EVM SetupMeasuring the Frequency Response Power Down VerificationButterworth Filter Butterworth Filter±1. THS4130 EVM Bill of Materials THS4130 EVM Bill of MaterialsP374CTR±ND General High-Speed Amplifier Design Considerations General High-Speed Amplifier Design Considerations
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