ZHCSH86B December 2017 – February 2019 LMH5401-SP
PRODUCTION DATA.
The standard EVM is used for measuring single-tone harmonic distortion and two-tone intermodulation distortion. All distortion is measured with single-ended input signals; see Figure 57. In order to interface with single-ended test equipment, external baluns are required between the EVM output ports and the test equipment. The Typical Characteristics plots are created with Marki™ baluns, model number BAL-0010. These baluns are used to combine two tones in the two-tone test plots. For distortion measurements the same termination must be used on both input pins. When a filter is used on the driven input port, the same filter and a broadband load are used to terminate the other input. When the signal source is a broadband controlled impedance, then only a broadband-controlled impedance is required to terminate the unused input.