No abstract

Using a sliding load for the calibration of a network analyser a wrong choice of sliding load positions can cause an incorrect calibration and lead to errors in the corrected measurements of an unknown reflection coefficient. The frequency dependence and error sensitivity have been studied for two distributions of the sliding load positions which are both easy to use. Application formulas are presented for the sliding load used with these data point distributions.

No abstract

A method to measure the noise properties of double bafrier resonant tunnelling (DBRT) diodes is described. The noise figure and noise measure of (nonoscillating) DBRT devices were measured over the full positive and negative bias voltage range, in the 1-1.6 GHz frequency band. Results show a clear bias dependence and almost frequency independence. The lowest noise measure observed on a 16 gm mesa DBRT diode biased in its active regions was 3, indicating that DBRT diodes are low noise devices.

No abstract