www.DataSheet4U.com
DB-2933-54
RF POWER amplifier using 2 x SD2933 N-Channel enhancement-mode lateral MOSFETs
General feature
■ ■ ■ ■ ■ ■ ■ ■
Excellent thermal stability Frequency: 1.6 - 54MHz Supply voltage: 48V Output power: 400W typ. Input power 10W max. Efficiency: 57% - 76% IMD at 300WPEP < -26dBc Load mismatch: 3:1all phases
Description
The DB-2933-54 is a RF broadband power amplifier intended for linear or nonlinear operation over the band 1.6 to 54 MHz using 2x SD2933 gold metallized N-channel MOS field-effect transistors. The temperature compensating biasing circuit supports class B and class AB operation. DB-2933-54 is designed in cooperation with Specific RF Devices. (e-mail :
[email protected])
Order Code
■
DB-2933-54
October 2006
Rev 1
1/13
www.st.com 13
Contents
www.DataSheet4U.com
DB-2933-54
Contents
1
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 3 4 5 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Photos of DB-2933-54 amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DB-2933-54 class of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 SD2933 mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 6.2 Mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Mounting sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
DB-2933-54
www.DataSheet4U.com
Electrical data
1
Electrical data
1.1
Maximum ratings
Table 1.
Symbol PIN POUT VDD
(1)
Absolute maximum ratings
Parameter Input power Output power Drain supply voltage Gate biasing voltage Drain current Power dissipation Value 16 500 50 15 20 400 Unit W W V V A W
VGG IDD PDISS
1. VGG from 9 to 15V and PIN < 16W
3/13
Electrical characteristics
www.DataSheet4U.com
DB-2933-54
2
Electrical characteristics
TA = +25 oC, VDD = 48V, IDQ = 2 x 900mA
Table 2.
Symbol Freq POUT Gain ND H2 H3 VSWR
Electrical Specification
Test Conditions Frequency range PIN = 10W PIN = 10W PIN = 10W 2
ND
Min 1.6 300
Typ
Max 54
Unit MHz W dB % dBc dBc
400 16.2 ± 0.6dB 57 - 76 -26 / -49 -13 / -58 3:1
Harmonic @ POUT = 300W
3RD Harmonic @ POUT = 300W Load mismatch all phases @ POUT = 300W
4/13
DB-2933-54
www.DataSheet4U.com
Typical performance
3
Typical performance
Output power & efficiency vs frequency
100 90 80
O u tp u t Po w er (d B m )
Figure 1.
60 59 58
Figure 2.
60 59 58
Output power & efficiency vs frequency
100 90 80 70 60 50 40 30 V dd = 48V Id q = 2 x 9 0 0 m A Pin = 1 0 W 20 10 0 E f f ic ie n c y ( % )
O u tp u t P o w e r (d B m )
- eff - Pout
- eff - Pout
57 56 55 54 53 52 51 50 0 5 10 15 20 25 30 35 40 45 50 55 60 65 V dd = 40V Id q = 2 x 9 0 m A Pin = 1 0 W
70 60 50 40 30 20 10 0
E f f ic ie n c y ( % )
57 56 55 54 53 52 51 50 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Fr e q u e n c y (M Hz )
Fr e q u e n c y ( M H z )
Figure 3.
0 -5 -1 0 -1 5 IM D (d B c ) -2 0 -2 5 -3 0 -3 5 -4 0 0 IMD 5
IMD vs frequency
Figure 4.
600 500 O u tp u t Po w er (W ) 400 300 200 100 0 10 14
Output power vs drain voltage
V dd = 48V Id q = 2 x 9 0 0 m A Po u t = 3 0 0 W PEP
Pin = 1 0 W Id q = 2 x 9 0 0 m A
18
22
26
30
34
38
42
46
50
10
15
20
25
30
35
40
45
50
55
60
65
1.6 M H z 2 8 M Hz
D r a in v o lt a g e ( V )
5 M Hz 4 0 M Hz 10 M H z 6 0 M Hz 2 0 M Hz
F r e q u e n c y (M H z )
5/13
Typical performance
www.DataSheet4U.com
DB-2933-54 Harmonics vs frequency
Figure 5.
0 -10 Harmonics (dBc) -20 -30 -40 -50 -60 -70 0
H 2 Vdd = 48V Idq = 2x 900 m A P P out = 300 W P E
5
H 3
10
15
20
25
30
35
40
45
50
55
60
65
Frequency (MHz)
6/13
DB-2933-54
www.DataSheet4U.com
Photos of DB-2933-54 amplifier
4
Photos of DB-2933-54 amplifier
Top view
Figure 6.
Figure 7.
Side view
7/13
DB-2933-54 class of operation
www.DataSheet4U.com
DB-2933-54
5
DB-2933-54 class of operation
class B : a low bias point with ~100mA per transistor
● ●
class AB : a higher bias point with ~ 900mA per transistor The bias point is 2x 100 mA if “BIAS” is left open and in this case a DC voltage of ~5V is present The bias point is 2 x 900 mA if “BIAS” is connected to ground. To switch-on biasing circuit, connect “PA_ON” to ground. To switch-off biasing circuit, left open “PA_ON”
To select a bias point, DB-2933-54 has a control port “BIAS”.
● ●
"PA_ON" control port / ON-OFF bias current
● ●
8/.