µµµµµPG133G

9

Floating the

µµµµµPG133G

It is possible to use the

µPG133G with only a single +3 V supply by employing a technique known as “floating”.

When the IC is floated using a +3 V supply, the voltage levels used to control the switch are elevated above ground

by +3 V.

When the

µPG133G is floated it is necessary to use DC blocking (C2, C3, C5) and grounding (C1, C4) capacitors.

This enables the IC to isolated so that +3 V can be applied to RF line. The value for DC blocking capacitors should

be chosen to accommodate the frequency of operation. Grounding capacitors are required to float the IC above

ground. The value for grounding capacitor should be chosen to accommodate the frequency of operation.

It is not recommended to float the

µPG133G for wide band application.

(Floating the

µPG133G with +3 V/0 V supply at 2 GHz-band, BW ≤ 50 MHz)

C1

C2

PIN CONNECTIONS

1

4

8

5

OUT2

GND

C5

OUT1

IN

C4

C3

GND

2. OUT2

3. GND

4. GND

5. IN

6. GND

7. OUT1

C1, C4 = 10 pF below :

Grounding capacitor

C2, C3, C5 = 100 pF :

DC blocking capacitor

The distance between grounding capacitor and IC’s GND pins, grounding capacitor and ground of the

substrate should be as shorter as possible to avoid the parasitic parameters. IC’s GND pin, No. 3, No. 4 and No.

6 are connected inside of the IC.