ECO7901 wide-band linear power amplifier (470 MHz) with transisto

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ECO7901 wide-band linear power amplifier (470 MHz) with transisto

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wide-band linear power amplifier (470 MHz) with transistors BLW34
ECO7901
wide-band linear power amplifier (470 MHz) with transistors BLW34
CONTENTS 3.1.1 3.1.2 ABSTRACT INTRODUCTION THEORETICAL CONSIDERATIONS equivalent circuit BLW34 output network input network HYBRID COUPLED AMPLIFIER Practical considerations Practical optimization Intermodulation, VSWR gain measurements CONCLUSIONS REFERENCES
Application Note ECO7901
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
ABSTRACT
Application Note ECO7901
application driver final stages TV-transposers band IV/V (470-860 MHz) linear wideband power amplifier been designed with transistors BLW34 coupled means -90° hybrids. Each transistor adjusted class-A peak sync output power 3-tone I.M. distortion -60dB varies between power gain Input output VSWR below 1.3. INTRODUCTION
This report describes realisation wide-band power amplifier transposer service band (470 MHz). amplifier designed with BLW34 transistor being developed ultra linear applications operating class Each device able deliver least peak sync output. BLW34 forms series with smaller devices BLW33 (1.0 BLW32 (0.5 power gain least BLW34 encapsulated inch capstan envelope with ceramic cap. THEORETICAL CONSIDERATIONS equivalent circuit BLW34
class operation BLW34 specified corresponding typical gain, input load impedance according Data sheets given Table Table (MHz) GAIN (dB) 15.2 12.6 10.1 (SERIES) 1.46 1.39 1.27 (SERIES) 1.93 2.84 4.00 (SERIES) 12.8 8.85 5.36 (SERIES) 11.0 9.97 7.67
facilitate calculations approximate equivalent circuit transistor input output impedance given. shown Fig.1.
0.71 handbook, halfpage
0.57
13.5
MGL353
Fig.1
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
3.1.1 OUTPUT NETWORK
Application Note ECO7901
circuit will designed printed circuit board with PTFE fibre glass dielectric having 2.74 thickness 1/32 inch. input output network start with piece stripline having width being width base collector leads. dielectric 1/32 inch characteristic resistance length collector lead amounts base lead different length. first step matching tune output capacitance transistor means collector R.F. choke. This choke executed stripline with width corresponding with characteristic resistance keep parallel capacitance this point possible. practical reasons choke connected main transmission line distance from transistor edge. design procedure referred Part this handbook (SC19B). results calculations before after computer optimization given Fig.2 Table
handbook, full pagewidth
0.57
13.5
,,,,,,, ,,,,,,,
21.2 71.7 71.7 4.67
MGL352
Fig.2
Table ELEMENT Smax. 16.8 18.2 8.58 38.2 3.91 2.48 BEFORE OPTIM. 22.1 20.8 9.76 43.5 3.09 1.23 AFTER OPTIM. UNIT
Smax maximum VSWR network. lenghts given hold lines. actual lengths printed-circuit board shorter; reduction factors are: 1.445 lines 1.556 line.
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
predicted minimum output power complete amplifier with transistors BLW34 0.95 0.95 2.8W 1.23 minimum output power transistor narrow band circuit, Smax specified above factor 0.95 represents power loss hybrid coupler output. 3.1.2 INPUT NETWORK
design procedure found Part this handbook (SC19B). results calculations summarized Fig.3 Table
handbook, full pagewidth
,,,,, ,,,,,
71.7 21.2
0.71
MGL354
Fig.3
Table ELEMENT 4.78 25.9 21.9 13.3 ±1.93 BEFORE OPTIM. 4.41 32.1 19.9 10.5 ±0.12 AFTER OPTIM. UNIT
resulting power gain variation caused transistor input network over frequency band. lengths lines hold dielectric. Transformation striplines printed-circuit board done same previous section. minimum power gain complete amplifier with transistors BLW34 expected
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
which: minimum power gain BLW34 narrow band circuit. power loss hybrid coupler reflection loss input network reflection loss output network. practical figures this means: 0.15 0.05
Application Note ECO7901
input VSWR single amplifier calculated vary from down 1.45 MHz. HYBRID COUPLED AMPLIFIER Practical considerations
previous pages theoretical approach single amplifier been discussed. practice, intention realize small compact amplifier printed-circuit board with input output terminal line easy cascading several amplifiers. Besides wide-band properties intention obtain higher output power, BLW34 branches connected parallel. same time course rather unacceptable that amplifier loads driver stage with mismatch causing VSWR MHz. Both problems solved sufficiently applying BLW34 branches parallel with wide-band coaxial hybrids basis. this configuration output power will nearly doubled; reduction input VSWR complete system value around explained from properties coupler applied. reflected power will absorbed resistor matching isolated port. This resistor consists power metal film resistor parallel. same been done output side. printed-circuit board needs double copper clad with PTFE fibre glass dielectric 2.74) losses UHF. thickness 1/32 inch been chosen; lines wide. Figure shows circuit diagram complete BLW34 class amplifier. biasing circuit drawn Fig.5. printed-circuit board amplifier lay-out Fig.6. correct earthing upper earth sheet parts connected lower sheet soldering copper straps edges printed-circuit board. black parts Fig.6 soldered copper straps. emitters grounded short possible applying copper straps under emitter leads. that reason holes board square instead round. Both transistors screwed water-cooled brass heatsink. several heatsink temperatures applied means TAMSON unit supplying water with thermostatically controlled temperature. tuning capacitors circuit film dielectric type with three tags which both earth terminals through small holes soldered upper well lower plane. Fixed capacitors r.f. path multi-layer ceramic chip type. coaxial connectors type, being soldered upper lower sheet. Practical optimization
started with optimization small signal basis with circuit inserted network analyzer chain, having swept S-parameter facilities. 1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
far, similar tuning methods have been applied described Ref.
Application Note ECO7901
Because rather complicated find best compromise between acceptable flat gain curve (S21) sufficient output power with i.m.d. dynamic large signal optimization method been realized. Figure shows block diagram. This tuning method based correlation between single tone compression point i.m.d figure linear amplifier. this set-up swept output power level amplifier under test kept constant required (detected) drive power monitored oscilloscope screen (PM3260). swept drive power available from sweep generator HP8620C combination with plug-in unit HP86222A. Because output power this system viz. appr. (+13 dBm) combined amplifier with BLW32 BLW33 (Ref. been added. latter combination shows overall gain approx. range MHz. When circuit under test inserted chain Fig.7, input power measured port hybrid corresponds principle with gain curve (S21) being measured with network analyzer; fact inverse other. When drive level slowly increased, shape gain curve changes somewhat when compression starts. careful retuning amplifier shape gain curve corrected again direction original smaller signal curve. actual single tone output power been measured with calorimetric watt meter HP435A when action sweep stopped. Also possible examine output signal itself means spectrum analyzer being loosely coupled pick-off device. Resuming said that advantage applying this high level tuning system characterized fact that output power leveled compression does start earlier gain fluctuations amplifier. This makes judgement compression level easier. Intermodulation, VSWR gain measurements
i.m.d. measurements television systems post offices advice apply 3-tone test method (vision carrier sound carrier sideband signal zero corresponds peak sync level). this reason wideband test set-up been realized. block diagram Fig.8. this set-up first sound vision carriers joined wide-band coaxial hybrid H1.Then sideband signal from (smaller) generator SMLU added hybrid complete 3-tone signal passes low-pass filter (700 1000 cut-off depending input frequency) continuously variable attenuator circulator (three different types needed cover least range MHz). output power measured with HP435A calorimetric watt meter i.m.d. observed with spectrum analyzer (HP8558B). Figure shows 3-tone i.m.d. results measured complete hybrid coupled BLW34 amplifier. idea sync drop different heatsink temperatures, measurements have been done maximum drop sync amounts Besides 3-tone test peak envelope power been measured two-tone third order i.m.d proved that there correlation between afore described 3-tone two-tone test method. known that advantage video precorrection i.m.d. amounts values Calculating with average two-tone i.m.d. interesting. From Fig.10 seen that output power more than doubled. Both tests have been done heatsink temperatures resp. 1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
Finally input output VSWR gain figures were measured only under small signal conditions. results amplifier branches heatsink temperature shown Figs VSWR figures input output expressed reflection damping (resp. S22) basis. According Fig.11 minimum reflection damping input amounts (VSWR 17.4) (VSWR 1.93) MHZ. output side worst reflection damping amounts -5.5 (VSWR 3.26) middle passband (Fig.13). power gain, represented S21, appr. (Fig.12). Resuming said that, Figs show, differences gain, input output VSWR between both branches rather small. Figs show final results complete hybrid coupled amplifier. Examining figures appears that minimum input reflection damping (S11) amounts appr. what corresponds with maximum VSWR 1.29. latter value mainly explained from specified maximum VSWR 1.25 applied Anaren hybrids. more attention paid matching isolated ports results improved. matching consists metal film power transistors parallel. They have low-frequency tolerances small signal gain complete amplifier amounts ±0.3 whilst dashed line shows results being temperature influence figures almost negligible. CONCLUSIONS
preceding pages theoretical practical design been described wide-band (470 MHz) high quality linear amplifier being equipped with BLW34 transistors operating class There some small differences between theoretical design practical circuit. calculated value chip capacitors Fig.4 practice appeared better choice. Also values C22, being calculated changed. value first instance chip capacitor parallel with planned. However this capacitor could omitted operational circuit. excepted results single amplifier: min. sync 3-tone i.m.d. sync realized this design. Here, have calculated with total insertion loss applied hybrids. They specified maximum 0.25 device (1.06 power). REFERENCES
Ref. Pitzalis R.A. Gilson Tables impedance matching networks which approximate prescribed attenuation versus frequency slopes. IEEE Transactions microwave theory techniques, Vol. MTT-19, April 1971, 381-386. Ref. A.H. Hilbers M.J. Wide-band linear power amplifier (470 MHz) with transistors BLW32 BLW33. C.A.B. report ECO7806.
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
handbook, full pagewidth
+VC1
,,,,,,,, ,,,,,,,, ,,,,,,,, ,,,,,,,,
BLW34
input
-90°
-90°
,,,,,,,, ,,,,,,,, ,,,,,,,, ,,,,,,,,
BLW34 +VC2
output
MGL355
Fig.4
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
handbook, full pagewidth
,,,,, ,,,, ,,,,, ,,,, ,,,,
BLW34 BD138
BAW62
MGL357
Fig.5
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Table LIST COMPONENTS (±5%) (±5%) (±5%) (±5%) (±5%) (±5%) (±5%) (±5%) stripline stripline stripline stripline Note
Application Note ECO7901
multilayer ceramic chip capacitor Tekelec-Airtronic part N2R2 film dielectric trimmer (cat. 2222 09001) multilayer ceramic chip capacitor (cat. 2222 13101) polyester capacitor multilayer ceramic chip capacitor (cat. 2222 13101) multilayer ceramic chip capacitor, (American Technical Ceramics) type 100A-8R2-J-Px-50 electrolytic capacitor multilayer ceramic chip capacitor, Tekelec-Airtronic part N3R9 polyester capacitor power metal film resistor PR37 type (cat. 2322 31001) carbon resistor; CR25 type carbon resistor; CR25 type power metal film resistor PR52 type (cat. 2322 32201) enamelled wire-wound resistor WR0617E style enamelled wire-wound resistor WR0617E style cermet preset potentiometer carbon resistor; CR25 type carbon resistor; CR25 type stripline 22.1 mm2; note microchoke stripline mm2; note mm2; note 15.2 mm2; note 14.3 mm2; note 29.9 mm2; note
ultra-miniature -90° coupler model 10264-3, range GHz; Anaren Microwave Inc.
These striplines printed double Cu-clad printed-circuit board with PTFE fibre-glass dielectric 2.74); thickness 1/32".
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
handbook, full pagewidth
Application Note ECO7901
ANAREN 10264-3
-90°
Fig.6 Printed-circuit board amplifier lay-out.
1998
ANAREN 10264-3
-90°
MGM805
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
handbook, full pagewidth
H-183-4 ATT.
coaxial det. SCOPE PM3260
HP8620C HP86222A SWEEP OSC. PLUG-IN
r.f. BLW32 BLW3
ext.
sweep H-183-4 ATT. ATT. pick-off ATT. D.U.T. BLW34
coaxial det. CAL.W. MTR. HP435A
gain curve constant output power SPECTRUM ANAL. HP8558B 0-line
MGL358
Fig.7 Dynamic compression test set-up.
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
handbook, full pagewidth
(vision)
peak sync level
GENERATOR SLRD
H-183-4
ampl.
H-183-4 LOW-PASS 700-1000 CAL.W. MTR. HP435A pick-off
GENERATOR SLRD
(sound)
vision i.m.d sideband sound carrier product signal carrier
(sideband) GENERATOR SMLU
ATT. AJ21ON quality (470-860)
D.U.T. BLW34
SPECTRUM ANAL. HP8558B
MGL359
Circulator ranges: MHz. MHz. 1000 MHz.
Fig.8 3-tone test set-up MHz.
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
MGL367
handbook, full pagewidth
sync
BLW34 hybrid coupled three-tone i.m.d.
(MHz)
Fig.9
MGL368
handbook, full pagewidth
BLW34 hybrid coupled two-tone i.m.d.
(MHz)
Fig.10
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
MGL361
handbook, full pagewidth
(dB)
(MHz)
Fig.11
handbook, full pagewidth
MGL362
(dB)
Branch Branch (MHz)
Fig.12
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
MGL363
handbook, full pagewidth
(dB)
Branch Branch (MHz)
Fig.13
handbook, full pagewidth
MGL364
(dB) (MHz)
Fig.14
1998
wide-band linear power amplifier (470 MHz) with transistors BLW34
Application Note ECO7901
MGL365
handbook, full pagewidth
(dB)
(MHz)
Fig.15
handbook, full pagewidth
MGL366
(dB) (MHz)
Fig.16
1998
Philips Semiconductors worldwide company
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other countries apply Philips Semiconductors, International Marketing Sales Communications, Building BE-p, P.O. 218, 5600 EINDHOVEN, Netherlands, Fax. 24825 Philips Electronics N.V. 1998
Internet:
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Printed Netherlands
Date release: 1998

ECO7901 wide-band linear power amplifier (470 MHz) with transisto

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