Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1986-10-15
1987-08-11
Salce, Patrick R.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323229, 323907, 307297, G05F 320
Patent
active
046864512
ABSTRACT:
In a GaAs integrated circuit, a voltage reference generator includes a pair of Schottky diodes and a first, current-source connected, depletion-mode MESFET coupled in series to conduct current from a ground node to a voltage supply node. The current-source connected FET causes a constant current to flow from the ground node through the diodes, producing a constant voltage drop which generates a constant reference voltage at a reference node between the diodes and FET. A second pair of Schottky diodes is connected in series between the source of the FET and the voltage supply node, in a loop coupling the source to the gate of the FET, to provide a voltage difference Vgs across the FET proportional to voltage drop across the second pair of diodes. This voltage difference varies with fabrication process and temperature variations and causes the first FET to modify the amount of current flow to compensate so as to maintain a constant voltage drop across the first pair of diodes. A second FET is connected between the reference node and the first, current-source connected FET and has its gate coupled to the source of the first FET, either directly or through one of the second pair of diodes. Any variations in supply voltage are transmitted to the drain of the first FET to maintain a constant voltage Vds and current Ids, thereby stabilizing the reference voltage against supply voltage variations and noise.
REFERENCES:
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patent: 4278929 (1981-07-01), Lee et al.
patent: 4433283 (1984-02-01), Gersbach
patent: 4477737 (1984-10-01), Ulmer et al.
patent: 4524318 (1985-06-01), Burnham et al.
patent: 4542331 (1985-09-01), Boyer
patent: 4641081 (1987-02-01), Sato et al.
Li Jim Y.
Weiss Frederick G.
Hoff Marc S.
Johnson, Jr. Alexander C.
Lovell William S.
Salce Patrick R.
Triquint Semiconductor, Inc.
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