万博集团仪器设备站 · 专业测试测量仪器授权供应商
介绍混频器的基本原理、频率关系，以及使用 VNA 的标量混频器测量功能评估变频损耗、端口隔离和驻波比等性能参数。
中文概述：本文介绍混频器的工作原理及其频率关系，并说明如何使用矢量网络分析仪的标量混频器测量功能评估混频器性能。下文为原文。
Mixers are typically 3-port devices that produce the sum or difference of two input frequencies. Most are active and require external power, but passive mixers (like audio mixers) need no power since they have no amplifier. In a typical mixer, RF and LO are the two inputs and IF is the output:
For example, if fin = 1 GHz and fLO = 500 MHz, then fout = 1.5 GHz or 500 MHz.
Engineers often need to evaluate mixer performance, including conversion loss, phase and group delay, the 1 dB compression point, isolation between ports and port VSWR. Phase and group delay are measured with a VNA equipped with the Vector Mixer Measurement function; the others use Scalar Mixer Measurement. This note introduces scalar mixer measurements.
