Harmonic distortion measurement of MAX3516 cable upstream amplifier
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More information: Wireless product webpage quick browsing MAX3516 data data application technical support
Goal: CATV upstream amplifier second and third harmonic distortion measurement
It is important to shield and suppress the second and third harmonics of the MAX3516 in the DOCSIS band from 5MHz to 42MHz. The conditions of this test are 5V power supply and + 62dBmv output. A series of curves showing harmonic values ​​are also given in the article. The data given below shows that the MAX3516 has excellent performance.
The MAX3516 is a member of a series of controllable gain upstream amplifiers designed for CATV upstream applications. The MAX3516 operates in the frequency range of 5MHz to 65MHz and provides a QPSK output signal of + 64dBmV. Because the input and output ports are differential, an external balanced unbalanced converter is required at the output. The variable gain feature provides more than 56dB of dynamic range, which is controlled by an SPI 3-wire interface. Gain control accuracy is 0.5dB. The MAX3516 is packaged in a 20-pin TSSOP-EP and can operate over an extended industrial temperature range (-40 ° C to + 85 ° C).
-All tests are conducted at room temperature
-VCC = 5V
-PIN = -13dBm / + 34dBmV
-High power mode
-The gain code is adjusted to meet the output power requirements
Test equipment list
| Spectrum Analyzer: | HP8561E | S / N 3611A01372 |
| Signal Generator: | HP8648D | S / N 3847A00658 |
| Power Supply: | HP34401A | S / N 3146A60402 |
| DMM: | HPE3631A | S / N KR73608150 |
Test device
performance
| Power Fundamental (dBmV) | |||
| Frequency (MHz) | Part 4 | Part 5 | Part 7 |
| 4.9 | 62.2 | 62.37 | 62.03 |
| 9.8 | 62.2 | 62.37 | 62.2 |
| 15 | 62.2 | 62.03 | 62.2 |
| 20 | 62.2 | 62.2 | 62.03 |
| 24.8 | 62.2 | 62.37 | 62.2 |
| 30 | 62.03 | 62.03 | 62.2 |
| 35 | 62.03 | 62.03 | 62.03 |
| 40 | 62.03 | 62.03 | 62.37 |
| 42 | 62.37 | 62.03 | 62.37 |
| HD2 (dBc) | HD3 (dBc) | |||||
| Frequency (MHz) | Part 4 | Part 5 | Part 7 | Part 4 | Part 5 | Part 7 |
| 4.9 | -66.7 | -67.17 | -69.5 | -69.17 | -69.17 | -68.33 |
| 9.8 | -63.5 | -65 | -67.5 | -63.33 | -62.34 | -62.5 |
| 15 | -64.33 | -67.16 | -68.5 | -59.17 | -60.83 | -59.33 |
| 20 | -69.17 | -73.17 | -72.16 | -58.33 | -58.17 | -58.33 |
| 24.8 | -83.37 | -72.17 | -73 | -57.5 | -57.5 | -57.5 |
| 30 | -79 | -66.33 | -69.17 | -58.5 | -58.5 | -57.33 |
| 35 | -76.33 | -66.5 | -70 | -58.66 | -58.66 | -59 |
| 40 | -77.83 | -67.53 | -73.34 | -59 | -58.83 | -58.17 |
| 42 | -76.34 | -69 | -75.34 | -58.34 | -59.5 | -58.34 |
Second harmonic
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