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PDF ECO7904 Data sheet ( Hoja de datos )
| Número de pieza | ECO7904 | |
| Descripción | WideBand Class-A Linear Power Amplifiers | |
| Fabricantes | Philips | |
| Logotipo |  |
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APPLICATION NOTE
A wide-band class-A linear
power amplifier
(174 − 230 MHz) with two
mtransistors BLV33
www.DataSheet4U.coECO7904
www.DataSheet4U.com
1 page  
Philips Semiconductors
A wide-band class-A linear power amplifier
(174 − 230 MHz) with two transistors BLV33
Application Note
ECO7904
In Fig.4 the typical results of crossmodulation and intermodulation measurements on a demonstration amplifier have
been given. Figures 5 and 6 show the S-parameters of the complete amplifier. The measuring set-up is depicted in Fig.7.
7 CONCLUSION
Two transistors BLV33, coupled by means of 3 dB −90° hybrids, can deliver an output power of typ. 40 W with an
associated gain of 8.5 dB. Required D.C. input power approx. 165 W. Using a high power sweep with adjustable
transistor output power levelling provides a suitable method to adjust a linear wideband power amplifier.
8 REFERENCES
Ref. 1:
G.L. Matthaei − Tables of Chebyshev Impedance Transforming Networks of Low-Pass Filter Form. Proceedings of the
IEEE August 1964, pp. 939 − 963.
Ref. 2:
A.H. Hilbers and M.J. Köppen − A wide-band linear power amplifier (470 − 860 MHz) with two transistors BLW34. C.A.B.
report ECO7901.
1998 Mar 23
5
5 Page 
Philips Semiconductors
A wide-band class-A linear power amplifier
(174 − 230 MHz) with two transistors BLV33
Application Note
ECO7904
16
handbook, full pagewidth
crossmod.
(%)
12
8
4
0 dB
−20 dB
−7 dB
∆V (%)
MGP991
Po sync =
50 W
40 W
30 W
0
168 175 182 189 196 203 210 217 f (MHz) 224
−44
handbook, full pagewidth
intermod.
product
(dB)
−46
−48
−50
−52
−54
−56
−58
−60
−62
168
175
intermod. −8 dB
product
−16 dB
0 dB = Po sync
−7 dB
182 189 196 203 210
MGP992
Po sync =
60 W
50 W
40 W
30 W
217 f (MHz) 224
Vision carrier level: −20 dB/0 dB.
Sound carrier level: −7 dB.
Sync level: 0 dB.
Fig.4 Crossmodulation and intermodulation products of the 2× BLV33 wideband Band III power amplifier.
1998 Mar 23
11
11 Page | ||
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| PDF Descargar | [ Datasheet ECO7904.PDF ] | |
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