Description:
The uPG2164T5N-EVAL-A evaluation board provides a quick and convenient means of
evaluating the performance of the NEC uPG2164T5N switch. In addition to the device, the board
provides DC block capacitors, power supply bypass capacitors, and RF and DC connectors.
A DC block capacitor is required at all RF ports. On this board, two parallel capacitors of 22pF are
used for this purpose. This configuration minimizes the mismatch effect associated with the serial
capacitor over a relatively wide frequency range (2 to 6GHz). For a narrow band application or an
application where the operating frequency is outside the specific frequency range, the user may
select a different capacitance value. Generally the performance of the switch circuit is not
sensitive, to a certain extent, to the value of DC block capacitors.
A 1000pF DC bypass capacitor is used on all control lines. For high speed applications the user
may choose smaller capacitance or no capacitor at all.
DC supply connectors:
P1 is control voltage V
cont1
, P2 is V
cont2
and pins P3 and P4 are the ground.
V
cont1
and V
cont2
should be connected to separate power supplies to provide the required control
logic.
RF connectors:
As indicated on the board, J1 is connected to the ANT1 port, J2 is connected to the ANT2 port, J3
(OUT1) is connected to the TX, and J4 (OUT2) is connected to the RX port.
Information on Board Material:
The board material is 20 mil thick Duroid 6002. Its dielectric constant is 2.94.
Switch Logic Table:
The following table lists the logic table for switch states.
Vcont1 Vcont2
ANT1 –
OUT1(TX)
ANT1 –
OUT2(RX)
ANT2 –
OUT1(TX)
ANT2 –
OUT2(RX)
ANT1 –
ANT2
TX – RX
H L
measure
ISOL
measure IL measure IL
measure
ISOL
measure
ISOL2*
measure
ISOL2*
L H measure IL
measure
ISOL
measure
ISOL
measure IL
