MMIC-based W-band Dicke switched direct-detection receiver

We have demonstrated a W-band Dicke switched direct-detection receiver based on advanced GaAs MMIC process technology. The receiver consists of two MMICs, a W-band six-stage balanced switching low noise amplifier and a unique W-band detector with vertical dot diode structure. The balanced switching low noise amplifier has achieved a gain of 37 dB from 90 to 95 GHz and an average isolation of 15 dB between on and off from 85 to 95 GHz. Based on hot/cold load calibration, the constructed Dicke switched direct-detection receiver has achieved a minimum resolvable temperature of 0.5 K with 10 ms integration at 50 KHz switching rate.