1880 MHz PA Driver with BFG21W

Philips Semiconductors
1880 MHz PA Driver with BFG21W
1880 MHz PA Driver with BFG21W
Application Note
JL-9901v0
Author
Jarek Lucek
April 9, 1999
Discrete Semiconductors - Mansfield
171 Forbes Blvd.
Mansfield, MA 02048
Abstract
th
BFG21W, the new 5 generation transistor from Philips Semiconductors, is well suited for PA driver applications in
AMPS, TDMA, CDMA and GSM systems. BFG21W’s performance is superior at 1880 MHz, 3.6V applications.
Under CW mode, the part is capable of P1dB=24dBm, efficiency of over 50% and typical Gp of 12 dB. BFG21W
delivers 23.5 dBm of linear output power under TDMA with a typical Gp of 12 dB and efficiency of above 45%.
Under CDMA mode, BFG21W delivers 21 dBm of linear output power with a typical Gp of above 12 dB and
efficiency of 40%.
Philips Semiconductors
1880 MHz PA Driver with BFG21W
INTRODUCTION
BFG21W is Philips Semiconductors’ 5th generation silicon bipolar RF wideband transistor in a
SOT343R plastic SMD package. The transistor delivers superior performance at frequencies below 3
GHz. It is manufactured according to the double poly process and characterized by a high transition
frequency (fT > 20 GHz) at low sub 3 Volt supply voltages. This application notes describes BFG21W
performance at 1880 MHz operation under CW, 2 Tone, TDMA and CDMA conditions.
PERFORMANCE OVERVIEW
The table below summarizes BFG21W’s typical performance capabilities under different signal
conditions.
System
CW
2Tone
TDMA
CDMA
Table 1:
*-
Vsupply
3.0 Volts
3.6 Volts
3.0 Volts
3.6 Volts
3.0 Volts
3.6 Volts
3.0 Volts
3.6 Volts
P1dB or Plinear*
dBm
Gain**
dB
Efficiency***
%
Icq=10mA
Icq=20mA
Icq=10mA
Icq=20mA
Icq=10mA
Icq=20mA
22
24
18
19.5
21
23.5
19
21
22
24
18
19
21
23.5
19
21
12
12
12.5
12.5
11.5
11.5
12.5
12.5
12
12
12.5
13
12
12
12.5
13
56
52
30
35
45
49
39
42
56
52
30
30
45
50
40
39
BFG21W 1880 MHz PA driver performance summary
CW - load power @ P1dB
2Tone - load power represents linear average power @ IMD levels reaching –28dBc.
TDMA - load power represents linear average power @ ACPR levels reaching –26dBc or ALT levels reaching –45dBc.
CDMA load power represents linear average power @ ACPR levels reaching –44dBc with 1.25MHz channel offset, 1.25MHz channel
bandwidth and 30KHz Adjacent Channel bandwidth
** - typical Gain at P1dB for CW or Plinear for 2Tone, TDMA, CDMA signals
*** - typical Efficiency at P1dB for CW or Plinear for 2Tone, TDMA, CDMA signals.
2
Philips Semiconductors
1880 MHz PA Driver with BFG21W
CIRCUIT DESCRIPTION
Figure 1 shows a circuit diagram for the 1880 MHz PA driver using the BFG21W. Appendix 1 includes the part list
of the demo board.
BFG21W, 1880 MHz demoboard
Vbb
Vs
R2
5.1ohm
R1
100ohm
R3
30ohm
C6
13pF
PMBT3904
R4
10ohm
C7
1nF
C3
13pF
OUTPUT
INPUT
VB
C1
24pF
C5
24pF
BFG21W
C4
2.4pF
C2
3.0pF
Figure 1: BFG21W common emitter demoboard for class-AB operation at 1880 MHz.
3
Philips Semiconductors
1880 MHz PA Driver with BFG21W
BOARD LAYOUT
Figure 3 shows the layout of the PCB, which has the following properties:
type: double copper-clad PTFE fiber-glass (backside ground)
h = 0.64 mm
t = 35 µm (Cu cladding, not c oated)
εr = 6.15
tanδ = 0.0019
Vbase bias Vbb
R3
Vsupply Vs
R1
R4
Q1
C7
R2
C3
C6
50 Ω INPUT
50 Ω OUTPUT
C1
C2
C4
C5
T1 - BFG21W
Figure 3: Layout of the 1880 MHz BFG21W PA driver.
Appendix 1 contains the part list for the demo board. The position of C2 and C4 components is critical. The
artwork file is available on a floppy disc (DXF or Gerber format). Appendix 2 contains Spice model for BFG21W.
4
Philips Semiconductors
1880 MHz PA Driver with BFG21W
PERFORMANCE
BFG21W was evaluated under 4 different modes of operation. Each mode of operation is summarized
below. All measurements were taken with 100% duty cycle signal.
CW
BFG21W under CW at 1880 MHz and 25 deg. C
Vc=3.6V, Icq=1mA, Vbb=0.9V
Vc=3V, Icq=1mA,Vb=0.9V
Pin
Pout
Pout
Gain
It
Eff
Pin
Pout
Pout
Gain
It
Eff
dBm
-3.3
0
3.6
7.88
9.9
11.3
13.2
15.7
19
dBm
5
10
15
20
22
23
24
25
26
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
398.11
dB
8.3
10
11.4
12.12
12.1
11.7
10.8
9.3
7
mA
13
22
39
70
89
102
120
143
182
%
6.95
12.99
23.17
40.82
50.88
55.89
59.81
63.18
62.50
dBm
-2.9
0.4
4
8.4
11
13
16.3
20.3
dBm
5
10
15
20
22
23
24
25
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
dB
7.9
9.6
11
11.6
11
10
7.7
4.7
mA
13
22
39
70
93
109
137
180
%
8.11
15.15
27.03
47.62
56.81
61.02
61.12
58.56
Vc=3.6V, Icq=5mA, Vbb=1.04V
Vc=3V, Icq=5mA,Vb=1.05V
Pin
Pout
Pout
Gain
It
Eff
Pin
Pout
Pout
Gain
It
Eff
dBm
-5.6
-1.7
2.6
7.23
9.3
10.7
12.4
14.8
18.3
dBm
5
10
15
20
22
23
24
25
26
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
398.11
dB
10.6
11.7
12.4
12.77
12.7
12.3
11.6
10.2
7.7
mA
16
26
43
74
94
107
124
150
188
%
5.65
10.99
21.01
38.61
48.17
53.28
57.88
60.23
60.50
dBm
-5.6
-1.4
2.9
7.6
10.3
12.2
15.1
19.6
dBm
5
10
15
20
22
23
24
25
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
dB
10.6
11.4
12.1
12.4
11.7
10.8
8.9
5.4
mA
16
25
42
74
96
114
144
187
%
6.59
13.33
25.10
45.05
55.03
58.34
58.15
56.37
Vc=3.6V, Icq=10mA, Vbb=1.11V
Vc=3V, Icq=10mA, Vb=1.1V
Pin
Pout
Pout
Gain
It
Eff
Pin
Pout
Pout
Gain
Ic
Eff
dBm
-7.1
-2.5
2.06
6.92
9.1
10.55
12.2
14.5
18.2
dBm
5
10
15
20
22
23
24
25
26
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
398.11
dB
12.1
12.5
12.94
13.08
12.9
12.45
11.8
10.5
7.8
mA
20
29
47
77
100
110
127
153
194
%
4.52
9.85
19.22
37.11
45.28
51.82
56.51
59.05
58.63
dBm
-6.8
-2.2
2.4
7.4
10
12
14.8
19.4
dBm
5
10
15
20
22
23
24
25
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
dB
11.8
12.2
12.6
12.6
12
11
9.2
5.6
mA
19
27
44
76
99
116
146
193
%
5.55
12.35
23.96
43.86
53.36
57.34
57.35
54.62
Vc=3.6V, Icq=20mA, Vbb=1.16V
Pout
Pout
Gain
It
Eff
Pin
Pout
Pout
Gain
It
Eff
dBm
-7.9
-3.1
1.7
6.7
8.9
10.28
12.1
14.4
17.9
dBm
5
10
15
20
22
23
24
25
26
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
398.11
dB
12.9
13.1
13.3
13.3
13.1
12.72
11.9
10.6
8.1
mA
28
33
49
80
98
110
129
156
196
%
3.23
8.66
18.44
35.71
46.21
51.82
55.63
57.92
58.03
dBm
-8
-3
1.9
7.2
9.8
11.8
14.5
19.2
dBm
5
10
15
20
22
23
24
25
mWatt
3.16
10.00
31.62
100.00
158.49
199.53
251.19
316.23
dB
13
13
13.1
12.8
12.2
11.2
9.5
5.8
mA
27
33
49
80
101
119
149
194
%
3.90
10.10
21.51
41.67
52.31
55.89
56.19
54.33
It=Ic+Ib, total current draw.
5
Vc=3V, Icq=20mA, Vb=1.18V
Pin
Philips Semiconductors
1880 MHz PA Driver with BFG21W
CW
Efficiency vs. Pout, BFG21W CW @ 3.6V
Efficiency (%)
Gain (dB)
Gain vs. Pout, BFG21W CW @ 3.6V
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
5
7
9
11
13
15
17
19
21
23
25
65.00
60.00
55.00
50.00
45.00
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
27
5
7
9
11
13
Pout (dBm)
Icq=1mA
Icq=5mA
Icq=10mA
Icq=20mA
Icq=1mA
19
21
23
25
27
Icq=5mA
Icq=10mA
Icq=20mA
65.00
60.00
55.00
50.00
45.00
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
5
7
9
11
13
15
17
19
21
23
25
27
5
7
9
11
13
Pout (dBm)
Icq=1mA
Icq=5mA
Icq=10mA
Icq=20mA
Icq=1mA
Gain vs. Pout, BFG21W CW @ 3.0V and 3.6V
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
17
19
21
23
25
27
25
27
Pout (dBm)
Icq=5mA
Icq=10mA
Icq=20mA
Efficiency vs. Pout, BFG21W CW @ 3.6V
65.00
60.00
55.00
50.00
Efficiency (%)
Gain (dB)
17
Efficiency vs. Pout, BFG21W CW @ 3.0V
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Efficiency (%)
Gain (dB)
Gain vs. Pout, BFG21W CW @ 3.0V
45.00
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
5
7
9
11
13
15
17
19
21
Pout (dBm)
Icq=10mA @ 3.6V
6
15
Pout (dBm)
23
25
27
5
7
9
11
13
15
17
19
21
Pout (dBm)
Icq=10mA, 3V
Icq=10mA @ 3.6V
Icq=10mA @ 3.0V
23
Philips Semiconductors
1880 MHz PA Driver with BFG21W
2 TONE
BFG21W under 2Tone at 1880 and 1881 MHz and 25 deg. C
Vc=3.6V, Icq=10mA, Vbb=1.1V
Pin
Pout
Pout
dBm
dBm
mWatt
-7.4
5
3.16
-2.8
10
10.00
1.9
15
31.62
3.9
17
50.12
6.1
19
79.43
7.23
20
100.00
8.66
21
125.89
Gain
dB
12.4
12.8
13.1
13.1
12.9
12.77
12.34
3rd low
dBc
-40
-37
-36
-34.7
-30.7
-26.5
-22
3rd high
dBc
-40
-40.8
-39
-37.3
-32.5
-27
-22
5th low
dBc
-57
-52
-48
-45
-38
-34.6
-27
5th high
dBc
-57
-63
-52
-45
-39
-34.2
-28
It
mA
16.3
27
42
51
64
71
81
Eff
%
5.39
10.29
20.91
27.30
34.48
39.12
43.17
Vc=3.6V, Icq=20mA, Vbb=1.16V
Pin
Pout
Pout
dBm
dBm
mWatt
-8.3
5
3.16
-3.4
10
10.00
1.45
15
31.62
3.5
17
50.12
5.8
19
79.43
7
20
100.00
8.43
21
125.89
Gain
dB
13.3
13.4
13.55
13.5
13.2
13
12.57
3rd low
dBc
-46
-40
-35
-32
-28.9
-25
-21
3rd high
dBc
-53
-49
-58
-48
-35
-29
-23
5th low
dBc
-60
-58
-50
-46
-41
-36
-29
5th high
dBc
-60
-60
-51
-49
-43
-37
-32
It
mA
27
34
48
57
69
76
84
Eff
%
3.25
8.17
18.30
24.42
31.98
36.55
41.63
Vc=3.0V, Icq=10mA, Vbb=1.1V
Pin
Pout
Pout
dBm
dBm
mWatt
-7
5
3.16
-2.5
10
10.00
2.2
15
31.62
4.3
17
50.12
6.9
19
79.43
8.6
20
100.00
10.8
21
125.89
Gain
dB
12
12.5
12.8
12.7
12.1
11.4
10.2
3rd low
dBc
-38
-36
-34
-33
-24
-21
-16
3rd high
dBc
-39
-37
-35
-31
-23
-18
-16
5th low
dBc
-56
-51
-45
-39
-29
-24
-20
5th high
dBc
-55
-54
-42
-37
-29
-25
-20
It
mA
16
26
41
51
64
74
90
Eff
%
5.65
10.99
22.04
28.08
35.46
38.61
39.97
Vc=3.0V, Icq=20mA, Vbb=1.17V
Pin
Pout
Pout
dBm
dBm
mWatt
-8.2
5
3.16
-3.2
10
10.00
1.7
15
31.62
4
17
50.12
6.55
19
79.43
8.26
20
100.00
10.44
21
125.89
Gain
dB
13.2
13.2
13.3
13
12.45
11.74
10.56
3rd low
dBc
-45
-38
-33
-30.5
-24
-20
-15
3rd high
dBc
-55
-55
-43
-36
-25
-19
-15
5th low
dBc
-60
-60
-46
-42
-33
-26
-20
5th high
dBc
-60
-59
-52
-47
-35
-29
-22
It
mA
27
33
47
56
68
78
93
Eff
%
3.35
8.66
19.22
25.57
33.38
36.63
38.68
It=Ic+Ib, total current draw.
7
Philips Semiconductors
1880 MHz PA Driver with BFG21W
2 TONE
Gain vs. Pout, BFG21W 2 Tone @ 3.6V
Efficiency vs. Pout, BFG21W 2 Tone @ 3.6V
45.00
40.00
35.00
14
13.5
13
12.5
Efficiency (%)
Gain (dB)
15
14.5
12
11.5
11
10.5
30.00
25.00
20.00
15.00
10.00
5.00
10
5
7
9
11
13
15
17
19
21
0.00
Avg. 2T Pout (dBm)
5
7
9
11
13
15
17
19
21
19
21
Avg. 2T Pout (dBm)
Icq=20mA
Icq=10mA
Icq=10mA
Gain vs. Pout, BFG21W 2 Tone @ 3.0V
Efficiency vs. Pout, BFG21W 2 Tone @ 3.0V
15
45.00
14.5
40.00
14
35.00
Efficiency (%)
Gain (dB)
13.5
13
12.5
12
11.5
30.00
25.00
20.00
15.00
11
10.00
10.5
5.00
10
0.00
5
7
9
11
13
15
17
19
21
5
9
11
9
11
15
Icq=10mA
Icq=10mA
Icq=20mA
13
15
17
19
5
-15
-20
-20
-25
-25
-30
-30
-35
-40
-45
17
Icq=20mA
Linearity vs. Pout, BFG21W 2 Tone @ 3.0V, 20mA
21
-15
7.5
10
12.5
15
17.5
-35
-40
-45
-50
-50
-55
-55
-60
-60
-65
-65
Avg. 2T Pout (dBm)
Avg. 2T Pout (dBm)
3rd high
8
13
Avg. 2T Pout (dBm)
IMD (dBc)
IMD (dBc)
7
7
Avg. 2T Pout (dBm)
Linearity vs. Pout, BFG21W 2 Tone @ 3.6V, 20mA
5
Icq=20mA
3rd low
5th low
5th high
3rd high
3rd low
5th low
5th high
20
22.5
Philips Semiconductors
1880 MHz PA Driver with BFG21W
TDMA
BFG21W under TDMA at 1880 MHz and 25 deg. C
Vc=3.6V, Icq=10mA, Vbb=1.1V
Pin
Pout
Pout
dBm
dBm
mWatt
-6.9
5
3.16
-2.4
10
10.00
2.6
15
31.62
7
20
100.00
9.4
22
158.49
11
23
199.53
12.8
24
251.19
15.3
25
316.23
Gain
dB
11.9
12.4
12.4
13
12.6
12
11.2
9.7
ACPR low
dB
-36
-36
-36
-35
-30
-26.7
-24.4
-22
ACPR high
dB
-36
-36
-36
-36
-30
-27
-24
-22
1st ALT low
dB
-72
-66
-62
-56
-49
-51
-47
-39
1st ALT high
dB
-72
-67
-62
-56
-49
-51
-47
-39
2nd ALT low
dB
-77
-76
-75
-71
-64
-57
-56
-55
2nd ALT high
dB
-77
-76
-76
-72
-64
-57
-56
-55
It
mA
19
27
43
74
95
110
129
154
Eff
%
4.62
10.29
20.43
37.54
46.34
50.39
54.09
57.04
Vc=3.6V, Icq=20mA, Vbb=1.16V
Pin
Pout
Pout
dBm
dBm
mWatt
-8
5
3.16
-3.1
10
10.00
1.7
15
31.62
6.7
20
100.00
9.2
22
158.49
10.7
23
199.53
12.6
24
251.19
15.1
25
316.23
Gain
dB
13
13.1
13.3
13.3
12.8
12.3
11.4
9.9
ACPR low
dB
-36
-36
-36
-35
-29
-27
-24
-22
ACPR high
dB
-36
-36
-36
-34
-29
-27
-24
-22
1st ALT low
dB
-74
-72
-65
-58
-50
-52
-46.8
-39
1st ALT high
dB
-74
-72
-65
-58
-50
-52
-46.6
-39
2nd ALT low
dB
-78
-77
-78
-72
-62
-58
-57
-56
2nd ALT high
dB
-78
-77
-78
-72
-62
-59
-57
-56
It
mA
28
34
49
78
98
111
130
160
Eff
%
3.14
8.17
17.93
35.61
44.92
49.93
53.67
54.90
Vc=3.0V, Icq=10mA, Vbb=1.11V
Pin
Pout
Pout
dBm
dBm
mWatt
-6.7
5
3.16
-2.2
10
10.00
2.4
15
31.62
7.6
20
100.00
10.7
22
158.49
12.7
23
199.53
15.8
24
251.19
20
25
316.23
Gain
dB
11.7
12.2
12.6
12.4
11.3
10.3
8.2
5
ACPR low
dB
-36
-35
-36
-31
-25.2
-23.4
-22
-20
ACPR high
dB
-36
-35
-35
-31
-25.4
-23.2
-22
-20
1st ALT low
dB
-72
-66
-62
-50.1
-49
-43
-36
-32
1st ALT high
dB
-73
-66
-62
-50
-49
-43
-36
-32
2nd ALT low
dB
-78
-75
-75
-68
-56
-56
-52
-42
2nd ALT high
dB
-78
-76
-75
-69
-56
-56
-51
-42
It
mA
19
27
43
76
100
119
150
193
Eff
%
5.55
12.35
24.51
43.86
52.83
55.89
55.82
54.62
Vc=3.0V, Icq=20mA, Vbb=1.17V
Pin
Pout
Pout
dBm
dBm
mWatt
-7.9
5
3.16
-3
10
10.00
1.9
15
31.62
7.3
20
100.00
10.4
22
158.49
12.6
23
199.53
15.4
24
251.19
19.9
25
316.23
Gain
dB
12.9
13
13.1
12.7
11.6
10.4
8.6
5.1
ACPR low
dB
-36
-35
-36
-32
-25
-22.6
-21
-20
ACPR high
dB
-36
-36
-34
-32
-25
-22
-20.9
-20
1st ALT low
dB
-62
-70
-64
-53
-50
-42
-35.6
-32
1st ALT high
dB
-62
-71
-64
-52
-51
-42
-35.2
-32
2nd ALT low
dB
-72
-76
-77
-68
-57
-55.9
-51
-42
2nd ALT high
dB
-75
-76
-77
-69
-57
-55.8
-51
-42
It
mA
27
34
48
78
102
122
152
197
Eff
%
3.90
9.80
21.96
42.74
51.79
54.52
55.09
53.51
It=Ic+Ib, total current draw.
9
Philips Semiconductors
1880 MHz PA Driver with BFG21W
TDMA
Gain vs. Pout, BFG21W TDMA @ 3.6V
Efficiency vs. Pout, BFG21W TDMA @ 3.6V
60.00
14
55.00
50.00
13
45.00
12
40.00
Efficiency (%)
Gain (dB)
15
11
10
9
35.00
30.00
25.00
8
20.00
7
15.00
10.00
6
5.00
5
5
7.5
10
12.5
15
17.5
20
22.5
0.00
25
5
Pout (dBm)
Icq=20mA
7.5
12.5
Icq=10mA
Icq=10mA
14
55.00
13
50.00
12
45.00
40.00
Efficiency (%)
60.00
11
10
9
20
22.5
25
Icq=20mA
35.00
30.00
25.00
20.00
15.00
7
10.00
6
5.00
5
0.00
5
7.5
10
12.5
15
17.5
20
22.5
25
5
7.5
10
12.5
Pout (dBm)
Icq=10mA
7.5
10
12.5
15
17.5
20
22.5
25
22.5
25
Pout (dBm)
Icq=20mA
Icq=10mA
Linearity vs. Pout, BFG21W TDMA @ 3.6V, 20mA
5
15
17.5
20
Icq=20mA
Linearity vs. Pout, BFG21W TDMA @ 3.0V, 20mA
22.5
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
25
5
ACPR,1st and 2nd ALT (dB)
ACPR,1st and 2nd ALT (dB)
17.5
Efficiency vs. Pout, BFG21W TDMA @ 3.0V
15
8
7.5
10
12.5
15
17.5
20
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
Avg Pout (dBm)
ACPR high
2nd ALT low
10
15
Pout (dBm)
Gain vs. Pout, BFG21W TDMA @ 3.0V
Gain (dB)
10
ACPR low
2nd ALT high
1st ALT low
Avg Pout (dBm)
1st ALT high
ACPR high
2nd ALT low
ACPR low
2nd ALT high
1st ALT low
1st ALT high
Philips Semiconductors
1880 MHz PA Driver with BFG21W
CDMA
BFG21W under CDMA at 1.88GHz and 25 deg. C
Vc=3.6V, Icq=10mA, Vbb=1.07V
Pin
Pout
Pout
dBm
dBm
mWatt
-6.7
5
3.16
-2.3
10
10.00
2.3
15
31.62
5
18
63.10
7.1
20
100.00
8.23
21
125.89
9.6
22
158.49
Gain
dB
11.7
12.3
12.7
13
12.9
12.77
12.4
ACPR low
dB
-58
-57
-58
-56
-49
-45
-41
ACPR high
dB
-58
-58
-62
-58
-49
-45
-42
It
mA
17
26
42
58
73
82
94
Eff
%
5.17
10.68
20.91
30.22
38.05
42.65
46.83
Vc=3.6V, Icq=20mA, Vbb=1.15V
Pin
Pout
Pout
dBm
dBm
mWatt
-8.2
5
3.16
-3.4
10
10.00
1.4
15
31.62
4.5
18
63.10
6.7
20
100.00
7.9
21
125.89
9.2
22
158.49
Gain
dB
13.2
13.4
13.6
13.5
13.3
13.1
12.8
ACPR low
dB
-73
-70
-73
-61
-49
-45
-42
ACPR high
dB
-67
-62
-57
-54
-48
-45
-41
It
mA
27
33
48
63
78
88
98
Eff
%
3.25
8.42
18.30
27.82
35.61
39.74
44.92
Vc=3.0V, Icq=10mA, Vbb=1.11V
Pin
Pout
Pout
dBm
dBm
mWatt
-6.7
5
3.16
-2.4
10
10.00
2.3
15
31.62
5.3
18
63.10
7.7
20
100.00
9.12
21
125.89
10.9
22
158.49
Gain
dB
11.7
12.4
12.7
12.7
12.3
11.88
11.1
ACPR low
dB
-62
-59
-58
-50
-43
-40
-37
ACPR high
dB
-65
-59
-60
-51
-43
-40
-38
It
mA
19
27
43
59
75
85
101
Eff
%
5.55
12.35
24.51
35.65
44.44
49.37
52.31
Vc=3.0V, Icq=20mA, Vbb=1.17V
Pin
Pout
Pout
dBm
dBm
mWatt
-8
5
3.16
-3.2
10
10.00
1.77
15
31.62
4.9
18
63.10
7.4
20
100.00
8.85
21
125.89
10.7
22
158.49
Gain
dB
13
13.2
13.23
13.1
12.6
12.15
11.3
ACPR low
dB
-74
-75
-65
-51
-43
-40
-37
ACPR high
dB
-66
-60
-55
-50
-43
-40
-38
It
mA
28
33
48
63
78
89
104
Eff
%
3.76
10.10
21.96
33.38
42.74
47.15
50.80
It=Ic+Ib, total current draw.
11
Philips Semiconductors
1880 MHz PA Driver with BFG21W
CDMA
Gain vs. Pout, BFG21W CDMA @ 3.6V
Efficiency vs. Pout, BFG21W CDMA @ 3.6V
55.00
15
50.00
14.5
45.00
14
40.00
Efficiency (%)
Gain (dB)
13.5
13
12.5
12
11.5
35.00
30.00
25.00
20.00
15.00
11
10.00
10.5
5.00
10
4
6
8
10
12
14
16
18
20
0.00
22
4
Pout (dBm)
Icq=10mA
6
10
Icq=20mA
16
18
20
22
20
22
20
22
Icq=20mA
Efficiency vs. Pout, BFG21W CDMA @ 3.0V
55.00
14.5
50.00
14
45.00
13.5
40.00
Efficiency (%)
15
13
12.5
12
35.00
30.00
25.00
20.00
15.00
11
10.00
10.5
5.00
10
0.00
4
6
8
10
12
14
16
18
20
22
4
6
8
10
Pout (dBm)
Icq=10mA
6
8
10
12
12
14
16
Icq=20mA
Icq=10mA
14
16
18
22
4
-35
-35
-40
-40
ACPR,1st ALT (dB)
-30
-45
-50
-55
-60
-65
6
8
10
12
14
16
-45
-50
-55
-60
-65
-70
-70
-75
-75
-80
Icq=20mA
Linearity vs. Pout, BFG21W CDMA @ 3.0V, 20mA
20
-30
-80
Avg Pout (dBm)
ACPR high
18
Pout (dBm)
Linearity vs. Pout, BFG21W CDMA @ 3.6V, 20mA
4
ACPR,1st ALT (dB)
14
Icq=10mA
11.5
12
12
Pout (dBm)
Gain vs. Pout, BFG21W CDMA @ 3.0V
Gain (dB)
8
ACPR low
Avg Pout (dBm)
ACPR high
ACPR low
18
Philips Semiconductors
APPENDIX 1:
Part list for BFG21W 1880 MHz PA driver
Resistors
R1
100 Ω
Leaded wirewound, 0.1W.
R2
5.1 Ω
Philips 0805, 0.1W metal film resistor.
R3
30 Ω
Philips 0805, 0.1W metal film resistor.
R4
10 Ω
Philips 0805, 0.1W metal film resistor.
Capacitors
C1,C5
24 pF
ATC100A, DC blocking capacitor
C2
3.0 pF
ATC100A, matching capacitor
C3,C6
13 pF
C4
2.4 pF
ATC100A, bias and supply decoupling
capacitor.
ATC100A, matching capacitor
C7
1.0 nF
ATC100A, supply low frequency
decoupling capacitor.
Transistors
T1
BFG21W
RF amplifying transistor.
Q1
PMBT3904
Biasing and thermal tracking small
signal transistor.
13
1880 MHz PA Driver with BFG21W
Philips Semiconductors
1880 MHz PA Driver with BFG21W
APPENDIX 2:
Spice parameters of the BFG21W
.SUBCKT BFG21W 10 11 12
Lbbond 2 5 7.209E-10
Lblead 5 8 2.251E-10
Lbfoot 8 11 1.1E-10
Cbfoot 8 12 1.17E-13
Lebond 3 6 5.15E-11
Lelead 6 9 6.914E-11
Lefoot 9 12 1.739E-10
Cefoot 9 12 1.95E-13
Lcbond 1 4 5.711E-10
Lclead 4 7 2.251E-10
Lcfoot 7 10 1.1E-10
Ccfoot 7 12 1.17E-13
Cbc 5 4 2E-15
Cbe 5 6 8E-14
Cce 4 6 8E-14
Cbpb 2 14 3.3E-13
Cbpc 1 13 3.47E-13
Cmet 1 3 1.7E-12
Rsub1 14 15 249.2
Rsub2 13 15 464.4
Rmut 3 15 100
Dio 16 1
+ D1
Rs 15 16 3.5
.MODEL D1 D
+ IS = 4.99E-13
+ N = 1.189
14
Q1 1 2 3 3 NPN
+ AREA = 1
.MODEL NPN NPN
+ IS = 3.835E-16
+ BF = 92
+ NF = 1
+ VAF = 35
+ IKF = 2.8
+ ISE = 9.005E-13
+ NE = 2.262
+ BR = 8.9
+ NR = 1.009
+ VAR = 2.25
+ IKR = 0.6507
+ ISC = 2.503E-15
+ NC = 1.209
+ RB = 1.492
+ IRB = 0
+ RBM = 0.3202
+ RE = 0.3429
+ RC = 0.8
+ CJE = 3.026E-12
+ VJE = 0.9
+ MJE = 0.2861
+ CJC = 1.041E-12
+ VJC = 0.6964
+ MJC = 0.308
+ CJS = 1.844E-12
+ VJS = 0.4237
+ MJS = 0.2606
+ XCJC = 0.5
+ TR = 1.5E-10
+ TF = 5.05E-12
+ XTF = 74
+ VTF = 0.8
+ ITF = 6.5
+ PTF = 0
+ FC = 0.875
+ EG = 1.11
+ XTI = 4.3
+ XTB = 0.5
.END
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