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PDF ECO7901 Data sheet ( Hoja de datos )
| Número de pieza | ECO7901 | |
| Descripción | WideBand Linear Power Amplifiers | |
| Fabricantes | Philips | |
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APPLICATION NOTE
A wide-band linear power
amplifier (470 − 860 MHz) with
two transistors BLW34
www.DataSheet4U.comECO7901
www.DataSheet4U.com
1 page  
Philips Semiconductors
A wide-band linear power amplifier
(470 − 860 MHz) with two transistors BLW34
Application Note
ECO7901
The predicted minimum output power of the complete amplifier with two transistors BLW34 is:
Po2 = 2-S---P-m---o-a--x1- ⋅ 0.95 = 2---1--⋅-.--21---3-.-8-- ⋅ 0.95 ≅ 2.8W
Po1 is the minimum output power of one transistor in a narrow band circuit, Smax is as specified above and the factor 0.95
represents the power loss of the hybrid coupler at the output.
3.1.2 THE INPUT NETWORK
The design procedure can be found in Part 1 of this handbook (SC19B).
The results of the calculations are summarized in Fig.3 and Table 3.
handbook, full pagewidth
,,,,,,,,,,71.7Ω
l1
21.2 Ω
l2
C1 C2
0.71 nH
50 Ω
0.9 nH
0.5 nH
1.4 Ω
MGL354
Fig.3
Table 3
ELEMENT
C1
l1
C2
l2
∆G
BEFORE OPTIM.
AFTER OPTIM.
UNIT
4.78 4.41 pF
25.9 32.1 mm
21.9 19.9 pF
13.3 10.5 mm
±1.93
±0.12
dB
∆G is the resulting power gain variation caused by the transistor and the input network over the frequency band. The
lengths of the lines hold for air as a dielectric. Transformation to striplines on a printed-circuit board is done in the same
way as in the previous section.
The minimum power gain of the complete amplifier with two transistors BLW34 is expected to be:
Go = Gt − 2AH − A1 − A2
1998 Mar 23
5
5 Page 
Philips Semiconductors
A wide-band linear power amplifier
(470 − 860 MHz) with two transistors BLW34
Application Note
ECO7901
Table 4
LIST OF COMPONENTS
C1 = C2 = 2.2 pF
multilayer ceramic chip capacitor Tekelec-Airtronic part no.
500 R15 N2R2 BA
C3 = C6 = C23 = C26 = 1.4 to 5.5 pF
C4 = C5 = C24 = C25 = 100 pF
C7 = C8 = C29 = 100 nF
C9 = C10 = C15 = C16 = 100 pF
C11 = C12 = C13 = C14 = 8.2 pF
film dielectric trimmer (cat. no. 2222 809 09001)
multilayer ceramic chip capacitor (cat. no. 2222 851 13101)
polyester capacitor
multilayer ceramic chip capacitor (cat. no. 2222 852 13101)
multilayer ceramic chip capacitor, ATC (American Technical Ceramics)
type 100A-8R2-J-Px-50
C17 = C18 = C28 = 6.8 µF, 63 V
C19 = C20 = C21 = C22 = 3.9 pF
electrolytic capacitor
multilayer ceramic chip capacitor, Tekelec-Airtronic part no.
500 R15 N3R9 CA
C27 = 470 nF
polyester capacitor
R1 = R2 = R5 = R6 = 100 Ω (±5%)
power metal film resistor PR37 type (cat. no. 2322 191 31001)
R3 = R4 = R8 = 10 Ω (±5%)
carbon resistor; CR25 type
R7 = 33 Ω (±5%)
carbon resistor; CR25 type
R9 = 220 Ω (±5%)
power metal film resistor PR52 type (cat. no. 2322 192 32201)
R10 = 5.6 Ω (±5%)
enamelled wire-wound resistor WR0617E style
R11 = 8.2 Ω (±5%)
enamelled wire-wound resistor WR0617E style
R12 = 100 Ω
cermet preset potentiometer
R13 = 120 Ω (±5%)
carbon resistor; CR25 type
R14 = 1.8 kΩ (±5%)
carbon resistor; CR25 type
H1 = H2 = ultra-miniature 3 dB −90° coupler model no. 10264-3, range 0.5 − 1,0 GHz; Anaren Microwave Inc.
L1 = L2
stripline (Zc = 72 Ω), 22.1 × 1.0 mm2; note 1
L3 = L6 = 1 µH
microchoke
L4 = L5
stripline (Zc = 21 Ω), 6.7 × 6.0 mm2; note 1
L7 = L8 = stripline
(Zc = 21 Ω), 3.0 × 6.0 mm2; note 1
L9 = L10 = stripline
(Zc = 72 Ω), 15.2 × 1.0 mm2; note 1
L11 = L12 = stripline
(Zc = 72 Ω), 14.3 × 1.0 mm2; note 1
L13 = L14 = stripline
(Zc = 72 Ω), 29.9 × 1.0 mm2; note 1
Note
1. These striplines are printed on double Cu-clad printed-circuit board with PTFE fibre-glass dielectric (εr = 2.74);
thickness 1/32”.
1998 Mar 23
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ECO7901.PDF ] | |
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