2.4 GHz monolithic microwave mixer with lumped balanced circuits

Monolithic microwave timers, operating at 2-3 GHz, have been developed, based on the lumped balanced circuit approach. By using two passive lumped balun circuits on the RF and LO ports, respectively, a wideband balanced mixer with good isolation can be realized. The conversion loss, under the IF at 200 MHz condition, was 12-14 dB at a LO power of 11 dBm. In addition, this mixer demonstrated an input IP₃ of 18.9 dBm at 2.4 GHz. The simulated results, based on the large-signal models, presented a fair agreement with the measured results, which reveals the importance of device modeling.