Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1986-07-22
1987-12-08
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324158R, G01R 1900
Patent
active
047120584
ABSTRACT:
An active load network for a device under test includes a logic circuit for anticipating the output state of the device under test and for turning on either a current source of a current sink to properly load its output. The current sink and current source each comprise a pair of CMOS transistors connected in series. One of each transistor pair turns on to either source or sink current and the other provides a variable impedance controlled by the voltage at its gate to regulate the amount of current. A pull-to-center transmission gate is also provided which pulls the output of the device under test to a level between a logic high and logic low when it is turned off.
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"Three-State Device and Circuit Testing", by Flaherty et al, IBM Tech. Disc. Bull., vol. 25, #11B, 4/83, pp. 6276-6290.
Branson Christopher W.
Sullivan Steven K.
Burns W.
Eisenzopf Reinhard J.
Geny William O.
Hulse Robert S.
Tektronix Inc.
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