SBOS710D October 2014 – February 2018 LMH5401
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 59. 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 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 terminate the other input. When the signal source is a broadband controlled impedance, only a broadband-controlled impedance is required to terminate the unused input.