A newly calibrated testbed based on a commercial vector network analyzer (VNA) is proposed for the fast in-band vector signal characterization and linearization of nonlinear multiport devices. The testbed can acquire both CW and wideband modulated periodic signals without breaking contact with the DUT, in up to five channels. The time-domain measurements are made possible by calibrating all the receivers in the frequency domain. This calibration provides a phase and amplitude correction for the modulation tones of all the incident and reflected waves in the acquisition bandwidth. The measurement bandwidth is determined at calibration by the bandwidth of the periodic OFDM signals used as a phase standard. It is independent of the VNA receivers’ bandwidth. A 500-MHz 100 000-tones 64-QAM OFDM constellation is recovered with 0.48% error vector magnitude (EVM). As an application, a dual-input hybrid Doherty-outphasing power amplifier (HD-OPA) is characterized at 2.08 GHz. A CW signal is used to determine the outphasing angle and input power levels, which provides the best drain and power-added efficiencies for each output power. The dynamic response of the dual-input HD-OPA is acquired on five channels by using the same testbed. Various periodic OFDM signals, with 24 000 tones, are measured before and after predistortion linearization in a fraction of a second.

中文翻译：

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使用矢量网络分析仪作为接收器的双输入功率放大器的时域表征和线性化

提出了一种基于商用矢量网络分析仪（VNA）的新校准测试平台，用于非线性多端口设备的带内矢量信号快速表征和线性化。该测试台最多可以在五个通道中采集CW和宽带调制周期信号，而不会中断与DUT的接触。通过在频域中校准所有接收机，可以进行时域测量。该校准为采集带宽中所有入射波和反射波的调制音调提供了相位和幅度校正。测量带宽是在校准时通过用作相位标准的周期性OFDM信号的带宽确定的。它与VNA接收器的带宽无关。使用0恢复500-MHz 100,000音64-QAM OFDM星座图。48％的误差向量幅度（EVM）。作为一种应用，双输入混合Doherty异相功率放大器（HD-OPA）的特性为2.08 GHz。CW信号用于确定移相角和输入功率电平，从而为每个输出功率提供最佳的漏极效率和功率附加效率。通过使用相同的测试台，可以在五个通道上获取双输入HD-OPA的动态响应。在预失真线性化之前和之后不到一秒的时间内，测量了具有24000个音频的各种周期性OFDM信号。通过使用相同的测试台，可以在五个通道上获取双输入HD-OPA的动态响应。在预失真线性化之前和之后不到一秒的时间内，测量了具有24000个音频的各种周期性OFDM信号。通过使用相同的测试台，可以在五个通道上获取双输入HD-OPA的动态响应。在预失真线性化之前和之后不到一秒的时间内，测量了具有24000个音频的各种周期性OFDM信号。