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Details, datasheet, quote on part number:NCO8101
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Datasheet text preview:
APPLICATION NOTE
A Wideband hybrid coupled amplifier (470 - 860 MHz) with 2 balanced transistors BLV57
NCO8101
Philips Semiconductors
A Wideband hybrid coupled amplifier (470 - 860 MHz) with 2 balanced transistors BLV57
CONTENTS 1 2 3 3.1 3.2 3.3 3.4 3.5 4 4.1 4.2 5 6 6.1 6.2 6.3 6.4 7 8 ABSTRACT INTRODUCTION DESIGN OF THE AMPLIFIER GENERAL REMARKS BIAS CIRCUIT SOME PROPERTIES OF THE BLV57 OUTPUT NETWORK INPUT NETWORK ADJUSTMENT OF THE AMPLIFIER OUTPUT CIRCUIT INPUT CIRCUIT THE HYBRID COUPLED AMPLIFIER MEASURED PERFORMANCE SMALL SIGNAL GAIN AND RETURN LOSSES GAIN COMPRESSION INTERMODULATION CROSS MODULATION CONCLUSIONS REFERENCES
Application Note NCO8101
1998 Mar 23
2
Philips Semiconductors
A Wideband hybrid coupled amplifier (470 - 860 MHz) with 2 balanced transistors BLV57
1 ABSTRACT
Application Note NCO8101
For application in TV transposers in band 4 and 5 (470 - 860 MHz) a wideband linear power amplifier has been designed with two balanced transistors BLV57 coupled by means of 3 dB -90° hybrids. The class-A DC-setting of the transistors is IC = 2 × 850 mA and VCE = 25 V. The main properties of the two prototypes are: Table 1 470 - 860 MHz Gain (Pi = 1 mW) Return losses input Return losses output Po at 1 dB gain compression Po at -55 dB intermod. (3-tone, -7, -8 and -16 dB) Cross modulation at Po = 15 W 2 INTRODUCTION UNIT dB dB dB W W % 17 19 28 17.5 9.4 AMPLIFIER 2 9.3 ±0.5 16 19 28 17.5 8.8 AMPLIFIER 3 9 ±0.5
For application in TV transposers for band 4 and 5 (470 - 860 MHz) a wideband linear power amplifier has been designed with two transistors BLV57 in class-A. The BLV57 is a balanced transistor (two identical chips) in a single envelope with a ceramic cap (SOT-161). 3 3.1 DESIGN OF THE AMPLIFIER General remarks
The schematic line-up of the complete amplifier is given in Fig.1.
1998 Mar 23
3
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