Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1998-04-15
2000-02-15
Brown, Glenn W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324638, 307125, 307130, G01R 2700, H01H 4700
Patent
active
060257091
ABSTRACT:
A variable termination load switch (102) is provided to enable transmission and group delay measurements to be made of a device under test (DUT) (103) using only one port of a vector network analyzer (VNA) (100). The variable termination load switch (102) selectively provides an open or a short based upon a signal provided to its control input (106). The variable termination load switch (102) has a load port (113) for connecting to one port of the DUT and the VNA port is connected to another port of the DUT during testing. The variable termination load switch (102) includes a diode (143) connected by a resistor (149) to the control input (106). The diode (143) has connected parallel transistors (141, 142) and a series transistor (140) to provide a load impedance matching the DUT impedance when the load is functioning either as a short or an open. Isolation capacitors (145) and (146) reduce the affect of AC signals from the control input (106).
REFERENCES:
patent: 4399400 (1983-08-01), Rockwell et al.
patent: 5243287 (1993-09-01), Hashoian et al.
patent: 5387868 (1995-02-01), Rust et al.
Brown Glenn W.
Wiltron Company
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