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We’ve characterized CMOS devices at cryogenic temperatures and build parameters for SPICE modeling. We’ve successfully demonstrated the cryogenic operations of the following circuits: digital-to-analog conversion (DACs), oscillators, radio-frequency (RF) driver/amplifiers, and low-noise amplifiers (LNAs). We were able to demonstrate few significant breakthroughs on ultrawide-bandwidth LNAs (~ 4 GHz), signal generation of ultrahigh frequency (~ 30 GHz), high-performance DACs with SFDR of > 70 dB, and an extremely low power electronic switch to increase the characterization speed of cryogenic measurements. We recently used a field-programmable gate-array (FPGA) circuit to demonstrate single-qubit control and readout by showing clear Rabi osci

Taiwan has strong industry for integrated-circuit fabrication and design. However, local companies lack experience on fabrication of qubits and the peripheral circuits for quantum computing. Our projects aim to developed knowledge for cryo-CMOS technologies, which is crucial to enable large-scale quantum computers. On the other hand, cryo-CMOS circuits also show great potential for space electronics application since the temperature in outer space can be as low as ~ 4 K. A communication transceiver can be realized by merging the circuit modules we’ve developed, which is key component for low-earth orbit (LEO) satellites. Industry does not have detailed information and experience using the modern CMOS technology and our pioneering work paves