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US 7,889,048 B2Granted
Resistor network and variable resistor simulator
AssigneePickering Interfaces Limited
InventorsDavid Paul Owen, Keith Thomas Moore
Life of this patent
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AssigneePickering Interfaces Limited
InventorsDavid Paul Owen, Keith Thomas Moore
Estimating the term…
A variable resistor network has a coarse resistance network and a fine resistance network connected in series with the coarse network. The coarse resistance network comprises a chain of series-connected resistors any one or more of which may be switched out of the series by individual parallel-connected relays. The fine network comprises a shunt resistor together with a fixed resistor and a series-connected adjustable resistor together connected in parallel with the shunt resistor. A control circuit is arranged to control the relays for the switching of the resistors of the coarse network and also to control adjustment of the adjustable resistor. A chosen resistance value can be set by appropriate switching of the coarse network and adjustment of the adjustable resistor.
A variable resistor network comprising a coarse network having a chain of series-connected switchable resistors, a fine network connected in series with said coarse network and comprising a shunt resistor together with a series-connected fixed resistor and adjustable resistor connected in parallel with the shunt resistor, and a control circuit arranged to control the switching of the resistors of the coarse network and adjustment of the adjustable resistor whereby a chosen resistance value can be set by appropriate switching of the coarse network and adjustment of the adjustable resistor.
A variable resistor network comprising a coarse network having a chain of series-connected resistors, a plurality of relays connected one in parallel with each resistor of said coarse network, a fine network connected in series with said coarse network and comprising a shunt resistor together with a series-connected fixed resistor and a software-controlled digital potentiometer connected in parallel with the shunt resistor, a control circuit arranged to control the switching of the relays of the coarse network and to control the adjustment of the digital potentiometer whereby a chosen resistance value can be set by appropriate switching of the relays of the coarse network and adjustment of the digital potentiometer, and a digital resistance sensor connected selectively across the coarse network and across the fine network, on a time-division basis.
Dependencies are inferred from the claim text.