Circuit compensating for change in internal power supply...

Details Circuit compensating for change in internal power supply... Circuit compensating for change in internal power supply...

1999-01-11

2001-01-30

Wong, Peter S. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C327S537000

Reexamination Certificate

active

06181119

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a voltage compensation circuit and a semiconductor integrated circuit device. More particularly, the present invention relates to a voltage compensation circuit that can compensate for an abrupt change in an internal power supply voltage, and a semiconductor integrated circuit device including such a circuit.
2. Description of the Background Art
A conventional internal voltage-down converter included in a semiconductor integrated circuit device will be described with reference to FIG.
5
.
A conventional internal voltage-down converter
900
of
FIG. 5
includes a comparator
27
and a PMOS transistor
29
. Comparator
27
has a positive input receiving an internal power supply voltage Vout from an output node Z
0
of internal voltage-down converter
900
, and a negative input receiving a reference voltage Vin. Comparator
27
compares reference voltage Vin with internal power supply voltage Vout.
PMOS transistor
29
connected between power supply voltage Vdd and output node Z
0
has a gate electrode connected to comparator
27
. PMOS transistor
29
is turned on/off in response to the output (comparison result) of comparator
27
. Output node Z
0
is charged when PMOS transistor
29
is turned on. Accordingly, the level of voltage Vout of output node Z
0
is adjusted.
In the conventional internal voltage-down converter
900
of the above structure, the ripple rejection is improved as the difference between the power supply voltage and the output voltage becomes greater.
The need arises for a semiconductor integrated circuit device to operate using a further lower voltage in order to satisfy the demands of higher integration density. The operating environment of a conventional voltage-down converter is getting more severe.
There was a problem that the level of internal power supply voltage Vout cannot be recovered to the level of the intended reference voltage Vin with respect to an abrupt change in internal power supply voltage Vout.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a voltage compensation circuit that can compensate for an abrupt change in the internal power supply voltage.
Another object of the present invention is to provide a semiconductor integrated circuit device that can operate at high speed by compensating for an abrupt change in the internal power supply voltage.
According to an aspect of the present invention, a voltage compensation circuit of the present invention compensates for a change in the internal power supply voltage. The voltage compensation circuit includes a detection circuit detecting a differential component of the internal power supply voltage, a comparator circuit comparing the differential component of the internal power supply voltage with a reference voltage, and a compensation circuit compensating for a change in the internal power supply voltage in response to the comparison result.
An advantage of the present invention lies in that change in the internal power supply voltage can be compensated for in response to only the differential component of the internal power supply voltage. Therefore, the level of the internal power supply voltage can be recovered speedily and properly to a desired level.
According to another aspect of the present invention, a semiconductor integrated circuit device includes a voltage-down converter generating an internal power supply voltage which is a down-converted version of a power supply potential, and a voltage compensation circuit compensating for a change in the internal power supply voltage in response to the result of comparison between a differential component of the internal power supply voltage and a reference voltage.
Another advantage of the present invention lies in that a voltage compensation circuit is provided that compensates for change in the internal power supply voltage in response to only the differential component of the internal power supply voltage with respect to an internal voltage-down converter generating an internal power supply voltage which is a down-converted version of a power supply voltage, so that the level of the internal power supply voltage can be recovered speedily and properly to a desired level. Accordingly, internal circuitry can operate properly and speedily, impervious to change in the internal power supply voltage.
Particularly, the voltage compensation circuit can alter the input of a comparator in response to only the differential component of an internal power supply voltage. As a result, an internal power supply voltage can be charged/discharged speedily and properly.
Particularly, the voltage compensation circuit includes a capacitor to charge the internal power supply voltage in response to only the differential component of the internal power supply voltage. As a result, the internal power supply voltage can be increased speedily and properly.
Particularly, a transistor or a diode can be used as a charging circuit.
Particularly, the voltage compensation circuit includes a capacitor to discharge the internal power supply voltage in response to only the differential component of the internal power supply voltage. Thus, the internal power supply voltage can be reduced speedily and properly.
Particularly, a transistor or a diode can be used as a discharging circuit.


REFERENCES:
patent: 5557193 (1996-09-01), Kajimoto
patent: 5694076 (1997-12-01), Ishibashi
patent: 5744998 (1998-04-01), Ito et al.
patent: 10-027027 (1998-01-01), None

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