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The paper addresses bandwidth widening of an analog signal path, composed of a high-speed infrared photodetector, an amplifier and a transmission line connecting the two. To investigate influence of design variables upon bandwidth a simplified model of the signal path is analyzed first. Several design scenarios are considered, including transmission line length adjustment, but also insertion of a...
We present results of equivalent-circuit modeling of center-conductor gap in coaxial connectors. We perform broad-band full-wave electromagnetic simulations of the connector interface and then model their results with a simple equivalent circuit. We further show that the model parameters have simple physical interpretation. Our results can be used to improve the accuracy of millimeter-wave scattering-parameter...
We present a simple small-signal parameterized equivalent circuit for HgCdTe photodetectors operating at high temperatures in the middle and long wavelength of the infrared spectrum. This circuit is capable of accurate modeling the impedance of these devices upon bandwidth of several GHz and for a wide range of bias voltage and temperatures. We have implemented this model as a parameterized sub-circuit...
A Global Sensitivity Analysis procedure is presented to efficiently rank influence strength of model parameters upon the model functional outputs. A modified Morris one-at-a-time algorithm is used for parameter sampling. Simulated model responses are transformed into global sensitivity functions using response discretization and a scalar Global Sensitivity Index. Two indices are tried — the reference...
We present a new method for calculating line lengths of offset-short standards so as to provide a broadband and accurate one-port vector-network-analyzer (VNA) calibration. Our method is based on an approximate uncertainty analysis of corrected VNA measurements. We estimate the maximum value of the total variance (i.e., the trace of the covariance matrix) of errors in those measurements at a single...
The time needed by a bistable circuit to reach its stable state, when the initial state of the circuit is close to its metastable point, can vary substantially - causing malfunction of encompassing systems, expecting limited resolve time. The paper presents novel models of resolve time for static D-latch circuits - to estimate the metastability effect more accurately, and set design margins properly...
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