UPG2314T5N-ZBT-EV-A

Evaluation Board Document
µPG2314T5N-ZBT-EV-A
Evaluation Board
o Circuit Description
o Typical Performance Data
o Circuit Schematic and Assembly Drawing
o Appendix: Evaluation Board Document of the uPG2314T5N-EVAL-A
Circuit Description:
This evaluation board provides a quick and convenient means of evaluating the performance of
the NEC uPG2314T5N power amplifier and RF switch uPG2214TK for a “range extension”
application at 2.4GHz ISM band (such as for Bluetooth or ZigBee applications). The circuit
provides two paths for a transmit signal of a Bluetooth or Zigbee RF transceiver: either through
the amplifier or direct pass through two switches. The functional diagram of this board is shown
below:
uPG2214TK
uPG2214TK
path 2 (thru)
RF OUT
RF IN
path 1
uPG2314T5N
The two paths are selected by the logic levels at the two control pin-connectors, Vcont1 and
Vcont2, (refer to the schematic for the connector designation) according to the following truth
table:
Vcont1 Vcont2
Path 1
Path 2
(PA)
(Thru)
3.0 V
0V
ON
OFF
0V
3.0 V
OFF
ON
The matching and bias circuits for the uPG2314T5N are the same as those used in the CEL’s
evaluation circuit board, uPG2314T5N-EVAL-A. For more information on the PA circuit design,
refer to the Evaluation Board Document of uPG2314T5N-EVAL-A in the appendix.
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 Data
Path 1:
Test conditions:
F=2.45GHz, Vcc=Ven=3V
The output power Pout, supply current Ic and gain as a function of input power Pin are shown in
the following table.
Pin
(dBm)
Pout
(dBm)
Gain
(dB)
Ic
(mA)
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
1.7
2.7
3.7
4.6
5.6
6.5
7.5
8.4
9.3
10.2
11.1
12.0
12.9
13.8
14.7
15.6
16.5
17.2
17.9
18.5
18.9
19.3
19.5
19.6
19.7
21.7
21.7
21.7
21.6
21.6
21.5
21.5
21.4
21.3
21.2
21.1
21.0
20.9
20.8
20.7
20.6
20.5
20.2
19.9
19.5
18.9
18.3
17.5
16.6
15.7
23
24
24
24
25
25
26
27
28
29
31
33
35
37
40
44
47
51
56
60
63
67
69
71
72
Path 2:
The insertion loss of the “thru” path is 1.2dB.
Evaluation Board Document
µPG2314T5N-EVAL-A
Evaluation Board
o Bias and Matching Circuits
o Output Power Control
o PCB Information
o Typical Performance
o Schematic and Assembly Drawing
Matching and Bias Circuits
As shown in the circuit schematic on the next page, the uPG2314T5N requires relatively simple
matching circuits. The inductor L1 is for input matching and should be placed close to the
device. At the output essentially no matching circuit is required. L2 functions as an RF choke and
C2 is DC block capacitor.
The uPG2314T5N is a two stage PA. The first stage bias is through Vcc1. A small section of
transmission line between the device and the bypass capacitor, C1, is needed to provide enough
isolation between RF and DC paths.
Output Power Control
The output power of uPG2314T5N can be adjusted by the voltage on Vcont pin. The control
curve is shown on the data sheet. To turn off the PA, Vbias+Venable pin should be set to 0V.
PCB Information
The PCB is Getek two layer board. The board thickness is 28mil.
Typical Performance
Refer to the data sheet for typical performance curves.
2