Two measurement figures are presented in this section. Figure 1 shows the RF output power of the HDIQ versus I or Q input power. The measurement is performed with a signal analyzer MS2691A from Anritsu. The LO signal with power of 5 dBm is provided by a signal generator APSIN20G from Anapico. The I and Q input signals with frequency of 100 MHz are provided by a function/arbitrary wave generator SDG6052x from Siglent. Figure 2 shows the phase noise of the RF output signal at different LO frequencies. The measurement is performed with a phase noise analyzer APPH40G from Anapico. The LO signal is provided by the same source with the same power as in Figure 1. The I and Q input signals are provided by the same source with power of +5 dBm and the same frequency as in Figure 1. The solid lines show the phase noise of the LO source. The dashed lines show the phase noise of the RF output of the HDIQ, which is dominated by the phase noise of the LO source, thus the residual phase noise of the HDIQ is at least 3 dB lower than the phase noise of the LO source. The phase noise contribution of the measurement instrument APPH400 is negligible.
Please note that both measurements are done with the HDIQ DI variant, i.e, the HDIQ with digital input interface only (SN < 14100).