UPG138GV Datasheet, PDF (6/8 Pages) NEC – L-BAND SPDT SWITCH

P_PG138GV
Floating the PPG138GV
It is possible to use the PPG138GV 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 PPG138GV 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 PPG138GV for wide band application.
(Floating the PPG138GV with +3 V/0 V supply at 2 GHz-band, BW d 50 MHz)
GND
C1
C2
OUT2
4
1
VCONT2
PIN CONNECTIONS
1. VCONT2
C3 ⁵
8
VCONT1
2. OUT2
3. GND
4. GND
IN
5. IN
C4
OUT1
6. GND
C5
7. OUT1
8. VCONT1
GND
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.
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