This application note gives description broadband power amplifier oper

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This application note gives description broadband power amplifier oper

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SD2932 MOSFET amplifier
This application note gives description broadband power amplifier operating over frequency range using STMicroelectronics MOSFET transistor SD2932. Table Typical achievable performances
Parameter Device Frequency Pout Gain Input return loss Drain efficiency Performance SD2932 88-108 >70%
July 2007
www.st.com
Amplifier design
AN1229
Amplifier design
Input matching network
Typical input gate-to-gate impedance SD2932 also expressed combination parallel resistance reactance using following formulas: Equation
5.38
Equation
4.14j
Therefore, order achieve good input matching performances over frequency range 88-108 unbalanced transformed into impedance with value close possible 5.38 From circuit schematic given Figure that input matching network based section balun (1:1 balun cascade with balun transformer) which transforms unbalanced balanced 5.56 2.78 ratio). first section, long coaxial cable second section, 3.9" long flexible coaxial cables with ferrite core NEOSIDE, connected described: inductor (L1) connected between gates compensate SD2932 input parallel reactance
Input matching network tuning
Figure Input Impedance balun cascade with balun
(dB)
Frequency (MHz)
AN1229 Figure Input Impedance balun cascade with balun
(dB)
Amplifier design
Frequency (MHz)
SD2932 input matching network tuned order achieve best compromise terms power gain (Gp) input return loss (Rtl) over frequency range MHz. Best results were achieved adding chip capacitor (C1) between RFIN blocking capacitor (C2).
Output matching network
output impedance each side combination output capacitance Coss optimum load resistance which determined follows: Equation
0.85 0.85 2500 6.02 Pout 150W
total optimum load, seen SD2932 (drain drain), 6.02 12.04 Therefore, simple section balun (1:1 balun cascade with balun transformer) used transform unbalanced balanced 12.5 6.25 which very near total optimum load resistance. first section, long flexible coaxial cable, second section, long flexible coaxial cables, connected described Figure compensate output capacitance Coss SD2932 inductor (L2) connected between drains. This network Coss) high pass filter with resonance frequency calculated below minimum operating frequency: Equation
180pF (per side) 90pF
Equation
Frequency resonance 88MHz 80MHz
Equation
Coss 44nH
Amplifier design Figure Power gain frequency
AN1229
Power Gain (dB)
Pout 300W
Frequency (MHz)
Figure
Drain efficiency frequency
Drain Efficiency
Pout 300W
Frequency (MHz)
Figure
Drain efficiency frequency
Return Loss (dB)
Pout 300W
Frequency (MHz)
AN1229
SD2932 typical performances conclusion
SD2932 typical performances conclusion
Figure Figure Figure show power gain, efficiency input return loss over frequency range constant output power drain supply voltage quiescent current Typical performances follows: Table Typical performances
Parameters
19.3
19.6
Finally, this report have demonstrated ST's SD2932 MOSFET transistor excellent performance wideband push-pull amplifier applications. Figure 88-108 circuit schematic
Table
88-108 circuit components list
Description 1/32" Woven fiberglass 0.0030 side, Flexible coax cable 0.006", long Transformer, flexible coax cable 0.1" 3.9". ferrite core NEOSIDE Transformer, flexible coax cable 0.1" 5.0" long. flexible coax cable 0.1" 5.0" long. VK200 Ceramic capacitor Chip capacitor chip capacitor
Symbol C2/C3/C4/C7/C8 C5/C6
Revision history Table 88-108 circuit components list (continued)
Description chip capacitor chip capacitor Resistor Chip resistor Resistor Resistor Turn trim resistor Resistor Resistor Zener diode inductor inductor inductor
AN1229
Symbol R2/R4
Revision history
Table
Date 21-Jun-2006 30-Jul-2007
Revision history
Revision Minor text changes document been reformatted Changes
AN1229
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