100-GHz Cooled Amplifier Residual AM and PM Noise Measurements, Noise Figure and Jitter Calculations
David A. Howe, J R. Ostrick
We report the first definitive PM and AM noise mea-surements at 100 GHz of indium phosphide (InP) amplifiers oper-ating at 5 K, 77 K, and room temperature. Amplifier gain ranged from +7to+30 dB, depending on input RF power levels and op-erating bias current and gate voltages. The measurement system, calibration procedure, and amplifier configuration are described along with strategies for reducing the measurement system noise floor in order to accurately make these measurements. We com-pute amplifier noise figure with an ideal oscillator signal applied and, based on the PM noise measurements, obtain NF = 0 8 dB, or a noise temperature of 59 K. Measurement uncertainty is esti-mated at 0.3 dB. Results show that the use of the amplifier with an ideal 100-GHz reference oscillator would set a lower limit on rms clock jitter of 44.2 fs in a 20-ps sampling interval if the power into the amplifier were 31.6 dBm. For comparison, clock jitter is 16 fs with a commercial room-temperature amplifier operating in saturation with an input power of 6.4 dBm.
IEEE Transactions on Microwave Theory and Techniques
and Ostrick, J.
100-GHz Cooled Amplifier Residual AM and PM Noise Measurements, Noise Figure and Jitter Calculations, IEEE Transactions on Microwave Theory and Techniques
(Accessed June 6, 2023)