Evaluation Board Document
µPG2253T6S-EVAL-A
Evaluation Board
o Circuit Description
o Typical Performance Data
o Circuit Schematic and Assembly Drawing
Circuit Description
The uPG2253T6S-EVAL-A evaluation circuit board provides a quick and convenient means of
evaluating the performance of NEC’s RF front end IC uPG2253T6S. The circuit board is RoHS
compliant.
The uPG2253T6S does not require any matching component at RF ports. A serial inductor of
1.8nH and 3.3nH are used at Vd1 and Vd3 lines respectively. The inductor values have some
minor impact on the RF performance. The values chosen for this evalboard should provide a
good starting point. Some small adjustment might be needed on an application board to achieve
optimal performance.
The PCB is FR4 four layer board. The top and bottom dielectric layers are 8mils thick. The total
board thickness is 62mils. The dielectric constant of FR4 is 4.3.
Typical Performance
Tx Path:
A plot of Pout, Gain, Current and PAE as a function of Pin and small signal (Pin=-30dBm) S-
parameters are shown on the next two pages.
Rx Path:
Typical measured insertion loss is 1.5dB (without subtraction of board loss). The board loss at
2.4GHz is about 0.3dB.
Pout, Gain, PAE and Idd vs. Pin
Test conditions: frequency=2.45GHz, Vdd=Ven=3V, Vsw=0V
