Power converter with 2.5 volt semiconductor process components

Details Power converter with 2.5 volt semiconductor process components Power converter with 2.5 volt semiconductor process components

1998-11-19

1999-06-15

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

G05F 156

Patent

active

059125500

ABSTRACT:
A power converter provides a voltage reference (Vdd) to a plurality of transistors on an integrated circuit with a limited voltage swing when a load is connected and removed. The power converter includes an opamp (100) having an input (+) receiving a voltage reference (V.sub.DIOD), an input (-) connected to a resistor divider (102, 104) and an output driving the gate of a transistor (110). The transistor (110) has a source to drain path providing a 3.3 volt supply (NV3EXT) to an output node (n2) which supplies Vdd. The output node (n2) is connected back to the resistor divider (102,104) and to the source of a cascode transistor (300). The cascode (300) is connected with cascode (302) to form a current mirror which is interconnected with transistor (304) and capacitor (306) to slow the response at node (n7) to transitions at the output node (n2). Cascode (300) drives a current mirror (314, 316). The operational amplifier (100) functions to control the gate voltage of transistor (110) to maintain the voltage Vdd at a constant value. With significant loading to the output, after the loading is removed, cascode (300) will turn on to cause transistor (316) to limit the voltage swing of Vdd until opamp (100) can return Vdd to a constant value.

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