GS7660

Vishay

formerly General Semiconductor

www.vishay.com

Document Number 74819

8

24-May-02

Ultra Precision Voltage Divider

An ultra precision voltage divider is shown below in Fig. 12.

To achieve the 0.002% accuracy, the load current has to be

kept below 100nA. However with a slight loss in accuracy,

the load current can be increased.

Battery Splitter

Fig. 13 shows a simple solution to obtain complementary +

and – supplies from a single power supply. The output volt-

ages are + and – half the supply voltage. Good accuracy

requires low load currents.

A disadvantage is the requirement of a floating input supply,

which in the case of a battery is not an issue.

Fig. 12 – Ultra Precision Voltage Divider

1

2

3

4

8

7

6

5

8

7

6

5

10

µF

C1

C2

10

µF

+

+

GS7660

≤ 100nA

2

±0.002%

Paralleling For Lower Output Impedance

Fig. 14 above shows two GS7660s connected in parallel to

achieve a lower output resistance. If the output resistance

is dominated by 1/ f C1, which is normally the case with the

GS7660, increasing C1 offers a greater advantage than

the paralleling of circuits.

1

2

3

4

8

7

6

5

8

7

6

5

10

µF

C1

+

GS7660

C2

10

µF

+

–

–

+

–

Output Common

(6V)

Fig. 13 – Battery Splitter

Fig. 14 – Paralleling for Lower Output Resistance

8

7

6

5

10

µF

C1

+

1

2

3

4

8

7

6

5

GS7660

1

2

3

4

8

7

6

5

GS7660

1/4 CD4077

C2

20

µF +

10

µF

C1

+