Capacitor for use in a capacitor divider that has a floating...

Details Capacitor for use in a capacitor divider that has a floating... Capacitor for use in a capacitor divider that has a floating...

1998-03-25

2001-07-17

Chaudhuri, Olik (Department: 2814)

Active solid-state devices (e.g., transistors, solid-state diode

Integrated circuit structure with electrically isolated...

Passive components in ics

C438S252000, C438S395000

Reexamination Certificate

active

06262469

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to capacitor dividers. More specifically, it relates to a capacitor for use in a capacitor divider having a floating gate capacitor as a corresponding capacitor.
BACKGROUND OF THE INVENTION
Capacitor dividers and voltage regulators are well known in the art.
FIG. 1
shows a capacitor divider in a conventional voltage regulator. Regulator
100
includes a capacitor divider
110
which includes high and low capacitors
120
and
130
coupled in series between two voltage sources V
pp
and V
ss
. The common electrical node between high and low capacitors
120
and
130
is a divider output line
140
which is an input line to comparator
160
and carries a varying voltage of V
div
. A reference line
150
having a reference voltage V
ref
asserted thereon is the second input line to comparator
160
. Comparator
160
asserts a signal onto comparator output line
170
which is coupled to a control gate of transistor
180
which has a source coupled to V
ss
and a drain coupled to V
pp
.
Maintaining a constant capacitive ratio (k) of the capacitor divider
110
as defined by equation
1
improves the performance of capacitor divider
110
and regulator
100
.
K=C1/(C1+C2)  (1)
where:
C1=Capacitance of high capacitor
120
, and C2=Capacitance of low capacitor
130
.
SUMMARY OF THE INVENTION
A capacitor divider includes two capacitors coupled in series between two voltage sources. A first capacitor is a floating gate capacitor having one plate being the control gate of a floating gate transistor structure and the other plate being a source, drain, and channel region of the floating gate transistor structure. The capacitive divider has the advantage of having at least one floating gate capacitor, can be implemented in a voltage regulator, and works for a variety of voltages across the capacitors.


REFERENCES:
patent: 4665355 (1987-05-01), McCollum et al.
patent: 4786828 (1988-11-01), Hoffman
patent: 5530275 (1996-06-01), Widdershoven
patent: 57-071165 (1982-05-01), None

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