Voltage controlled current source device

Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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Reexamination Certificate

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07449873

ABSTRACT:
An integrated voltage controlled current source device is provided, that extends the high accuracy, low drift output current over a large current range, and provides more headroom and better power efficiency than the standard shunt resistor and INA (instrumentation amplifier) current source arrangement. The device has a control voltage input, a load current output and a current set terminal for a connection of a current set resistor. It contains a selected leg biasing set voltage, corresponding to a control voltage applied to the control voltage input of a regulating driver amplifier providing a regulated voltage to be applied across the current set resistor, thereby causing a reference current to flow through the current set resistor and selected leg(s) of a current mirror. Furthermore, the device contains a dynamically matched current mirror that mirrors the reference current to the load output current. The algorithm for selecting the current mirror legs may be a pseudo-random or a defined pattern.

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patent: 2003/0071678 (2003-04-01), Paulus
patent: 2005/0077972 (2005-04-01), Oehm
patent: 100 28 098 (2001-12-01), None
patent: 0 359 315 (1990-03-01), None

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