Voltage variation correction circuit

Details Voltage variation correction circuit Voltage variation correction circuit

2000-02-18

2001-05-22

Nguyen, Matthew (Department: 2838)

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

C323S311000

Reexamination Certificate

active

06236195

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a circuit for correcting variation in voltage (hereinafter referred to as voltage variation correction circuit).
2. Description of the Related Art
FIG. 2
shows a conventional voltage supply circuit. The voltage supply circuit has an input terminal
1
to which a reference voltage Vref is externally inputted. The input terminal
1
is connected to an operational amplifier
2
configured as a voltage follower. The input terminal
1
is connected to a non-inverting input terminal of the operational amplifier
2
while an output of the operational amplifier
2
is connected to an inverting input terminal thereof. The output of the operational amplifier
2
is connected to an output terminal
3
. A load circuit
4
a
is connected between the output terminal
3
and a ground voltage GND, and a load circuit
4
b
is connected between the output terminal
3
and a power supply voltage Vdd. As a result, it impossible to supply power having the same voltage as the reference voltage Vref from the output side of the operational amplifier
2
to the load circuits
4
a
,
4
b
without requiring a power from the reference voltage Vref, which is supplied to the input terminal
1
.
However, there is the following drawback in the conventional circuit. Even if loads in the load circuits
4
a
,
4
b
are varied, a voltage at the output terminal
3
need be kept constant. It is necessary to increase an output capacity of the operational amplifier
2
so as to keep the voltage at the output terminal
3
constant. If the output capacity is increased, the operational amplifier
2
always consumes much power, which prevents the conventional circuit from saving or reducing a power consumption.
SUMMARY OF THE INVENTION
To solve the foregoing problem, a typical voltage variation correction circuit of the invention has the following configuration. That is, it comprises an output terminal for outputting a given voltage, a transistor connected between a power supply voltage and the output terminal, a capacitor connected between a control electrode of the transistor and the output terminal, and a resistor connected between the control electrode of the transistor and the power supply voltage.


REFERENCES:
patent: 2897430 (1959-07-01), Winkel
patent: 4602322 (1986-07-01), Merrick
patent: 4651264 (1987-03-01), Hu
patent: 5541500 (1996-07-01), Krahl

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