Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Reexamination Certificate
2004-07-23
2010-10-19
He, Amy (Department: 2831)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
Reexamination Certificate
active
07816926
ABSTRACT:
An analyzer for measuring the response of an electronic device (DUT206) to an RF input signal from a signal generator (240a) is described. An active load pull circuit (201) is connected to the DUT206, which receives an output signal from the DUT206and then feeds a modified signal back to the DUT206. The signal is modified by a signal processing circuit (237) in view of input signals x, y to control the magnitude gain and phase change effected by the feedback circuit (237). Thus, positive feedback loops are avoided and better control of the analyzer is permitted. A network analyzer, or other signal measuring device (242), logs the waveforms (from which s-parameters derived) observed at ports of the DUT206, thereby allowing the behavior of the DUT206under various load conditions to be analyzed.
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Benedikt Johannes
Tasker Paul Juan
He Amy
Jackson Walker L.L.P.
Mesuro Limited
Rourk Christopher J.
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