Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1992-03-24
1994-03-01
Sterrett, J. L.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323907, G05F 316
Patent
active
052911217
ABSTRACT:
A method and apparatus for a circuit physically realizing a virtual ground function producing a virtual ground voltage halfway between the supply and common voltages and having improved accuracy and stability is described. A stable bias current source is coupled to a precision resistor voltage divider network, which is used as a voltage reference generator to produce a virtual ground voltage of a precise value. This reference voltage is coupled to an operational amplifier configured in a unity gain configuration. The circuit thus created offers numerous advantages over the virtual ground circuits in use in the prior art. An integrated circuit implementing this circuit is described, and alternative packaging embodiments are disclosed. Other embodiments are also disclosed.
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Granahan Mark E.
Neale Todd M.
Whitney Brad P.
Courtney Mark E.
Donaldson Richard L.
Sterrett J. L.
Texas Instruments Incorporated
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