336 GHz Phase Sensitive Transceiver Vector Voltmeter VDI

336 GHz Phase Sensitive Transceiver Vector Voltmeter VDI 336 GHz Tx VDI 336 GHz Rx www. vadiodes. com 1

336 GHz Phase Sensitive Transceiver Phase (deg) Magnitude (d. Bm) 336 GHz Virginia Diodes www. vadiodes. com 2 12/31/2021

336 GHz Phase Sensitive Transceiver • 336 GHz Transmitter – 17 m. W output power • 336 GHz Receiver – Mixer conversion loss 10. 5 d. B (SSB) – Mixer noise temperature 1300 K (SSB) • Fully phase-locked system • System dynamic range 94 d. B – Up to 104 d. B with slight compression – Dynamic range limited by Lock-in noise floor • VDI Tx-Rx has much larger dynamic range (at least 20 d. B higher) Virginia Diodes www. vadiodes. com 3 12/31/2021

Tx-only Amplitude Stability 2, 5 Turn-on transient Output Power (m. W) 2, 5 2, 4 2, 3 2, 2 Air-handler turning on Thru the night 2, 1 2, 0 0 2 4 6 8 Time (hours) Virginia Diodes www. vadiodes. com 4 10 12 14 Measured with Erickson calorimeter 12/31/2021

-3, 20 -110, 0 -3, 25 -115, 0 -3, 30 -120, 0 -3, 35 -125, 0 -3, 40 -130, 0 -3, 45 -135, 0 -3, 50 -140, 0 Turn-on 0 0, 5 transient 1 1, 5 2 2, 5 3 3, 5 Mag. Time (d. Bm)(hours) Phase (deg) Virginia Diodes www. vadiodes. com 5 Phase (deg) Power (d. Bm) Full Tx-Rx 336 GHz Stability 4 Stability 12/31/2021 of full system with Lock-in

Full Tx-Rx 336 GHz Stability 3, 40 -161, 00 3, 35 Power (d. Bm) 3, 30 -165, 00 3, 25 -167, 00 3, 20 3, 15 -169, 00 3, 10 -171, 00 3, 05 -173, 00 -175, 00 0 10 20 30 40 50 60 Time (minutes) Mag. (d. Bm) Phase (deg) 70 Virginia Diodes www. vadiodes. com 6 12/31/2021 Phase (deg) -163, 00

336 GHz Phase Sensitive Transceiver • Systems show excellent stability after initial warmup • Amplitude stability – Standard deviation ~0. 005 d. B • Phase stability – Standard deviation ~0. 4 deg over minutes – Long term phase drift 3 -5 degrees over hours Virginia Diodes www. vadiodes. com 7 12/31/2021