A 24-GHz low power and high isolation active quasi-circulator

A 24-GHz novel active quasi-circulator is developed in TSMC 0.18-µm CMOS. We proposed a new architecture by using the canceling mechanism to achieve high isolations and reduce the circuit area. The measured insertion losses |S<inf>32</inf>| and |S<inf>21</inf>| are 9 and 8.5 dB, respectively. The isolation |S<inf>31</inf>| is greater than 30 dB. The dc power consumption is only 9.12 mW with a chip size of 0.35 mm<sup>2</sup>.

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