Electricity: power supply or regulation systems – Remote sensing
Patent
1978-05-30
1979-07-31
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
323 22R, 323 23, G05F 156
Patent
active
041631889
ABSTRACT:
A system for establishing a precise reference current and steering the precise reference current through a load. A reference resistance is connected between a first node and a common terminal and a first reference voltage is maintained at the first node to establish a precise current flow through the reference resistance. A capacitance is connected between the source and the gate of a field effect transistor. A first switch is provided for connecting the field effect transistor in series with the reference resistance. A control loop is connected to a second node in the series circuit between the first switch and the field effect transistor and to a second reference voltage terminal. A second switch is provided for connecting the control loop to the gate of the field effect transistor; and a third switch connected to the second node is provided for connecting the field effect transistor in series with a load. When the first and second switches are closed and the third switch is open, the control loop causes the capacitance to be charged until the voltage at the second node matches the second reference voltage to thereby provide a voltage across the gate and source of the field effect transistor for sustaining the flow of the precise current through the reference resistor. When the first and second switches are opened and the third switch is closed, the charge on the capacitance causes the precise current to continue to flow from the field effect transistor and the third switch steers the current through the load.
REFERENCES:
patent: 3873905 (1975-03-01), Marek
patent: 3899692 (1975-08-01), Caswell
patent: 4051428 (1977-09-01), Imai
National Semiconductor Corporation
Pellinen A. D.
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