Constant-voltage generating circuit

Details Constant-voltage generating circuit Constant-voltage generating circuit

1992-01-23

1993-10-12

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

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

3072961, G05F 316

Patent

active

052529096

ABSTRACT:
In a constant-voltage generating circuit wherein a first series circuit of PMOS transistors, a second series circuit of a PMOS transistor and an NMOS transistor and a third series circuit of PMOS transistors are connected between a power source line and a ground line, a capacitive element is connected between a common node of the PMOS transistors of the first series circuit and the ground line. In addition to this capacitive element, another capacitive element may be connected between the node and the power source line. Since the node is connected to gates of one of the PMOS transistors of the first series circuit and the PMOS transistor of the second series circuit, the capacitance at this node with respect to the power source line is large. Thus, when the power supply voltage fluctuates abruptly, the voltage at the first node also changes and thus the output voltage also changes. This phenomenon can be suppressed by the action of the capacitive element connected between the common junction node of the first series circuit and the ground line.

REFERENCES:
patent: 3932768 (1976-01-01), Takahashi et al.
patent: 5030903 (1991-06-01), Bernard et al.
patent: 5132936 (1992-07-01), Keswick et al.

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