300-GHz-band CMOS transceiver

300-GHz-band transceiver chipsets with 40-nm CMOS process has been realized. A 300-GHz-band transmitter generates a modulated signal with 105 Gbps at the maximum, and the receiver demodulates a modulated signal of a maximum of 32 Gbps. The most difficult point in designing a 300-GHz-band transceiver with CMOS process is that the maximum operating frequency (f
_max
) of transistors does not reach 300 GHz. Key technologies for designing a transceiver circuit exceeding the maximum operating frequency of transistors and the measurement results will be described.