A CMOS series/shunt switching type S/H IC for Ka-band direct RF under sampling receiver

Direct RF under sampling reception has been developed to reduce the size and the power consumption of the terrestrial wireless terminals. We applied this reception method to Ku-band very small aperture terminal (VSAT). In this paper, we develop a CMOS sample and hold (S/H) IC for Ka-band VSAT receiver. Since Ka-band VSAT requires higher RF frequency operation (19.4-20.2 GHz) and wider system bandwidth (800 MHz) than the Ku-band one, high isolation series/shunt sampling switch, reactive on-chip matching circuit for RF input and high speed sampling clock circuit are needed. The proposed S/H IC is designed and fabricated in 90 nm CMOS process. The fabricated IC performs the |S11| of lower than -19.4 dB and the signal-to-noise ratio (SNR) of higher than 27.3 dB in the reception system bandwidth of Ka-band VSAT (19.4-20.2 GHz).