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NXP Semiconductors AN10714 Application Note

NXP Semiconductors AN10714 Application Note

Using the blf574 in the 88 mhz to 108 mhz fm band
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AN10714
Using the BLF574 in the 88 MHz to 108 MHz FM band
Rev. 01 — 26 January 2010
Document information
Info
Keywords
Abstract
Content
600 MHz
BLF574,
performance, high voltage LDMOS, amplifier
implementation, Class-B CW, FM band, pulsed power
This application note describes the design and the performance of the
BLF574 for Class-B CW and FM type applications in the 88 MHz to
108 MHz frequency range.
Application note

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  • Page 1 AN10714 Using the BLF574 in the 88 MHz to 108 MHz FM band Rev. 01 — 26 January 2010 Document information Info Content Keywords BLF574, implementation, Class-B CW, FM band, pulsed power Abstract This application note describes the design and the performance of the BLF574 for Class-B CW and FM type applications in the 88 MHz to 108 MHz frequency range.
  • Page 2 NXP Semiconductors Revision history Date Description 20100126 Initial version AN10714_1 Application note Using the BLF574 in the 88 MHz to 108 MHz FM band Rev. 01 — 26 January 2010 AN10714 © NXP B.V. 2010. All rights reserved. 2 of 21...

  • Page 3: Introduction

    Class-B CW and FM type applications in the 88 MHz to 108 MHz frequency band. AN10714_1 Application note Using the BLF574 in the 88 MHz to 108 MHz FM band Rev. 01 — 26 January 2010 AN10714 © NXP B.V. 2010. All rights reserved. 3 of 21...

  • Page 4: Fig 1. Blf574 Input Circuit Schematic;

    Application note Using the BLF574 in the 88 MHz to 108 MHz FM band BLF574 input circuit schematic; 88 MHz to 108 MHz Rev. 01 — 26 January 2010 AN10714 001aal304 © NXP B.V. 2010. All rights reserved. 4 of 21...

  • Page 5: Fig 2. Blf574 Output Circuit Schematic;

    Application note Using the BLF574 in the 88 MHz to 108 MHz FM band BLF574 output circuit schematic; 88 MHz to 108 MHz Rev. 01 — 26 January 2010 AN10714 © NXP B.V. 2010. All rights reserved. RF out 001aal305...

  • Page 6: Fig 3. Blf574 Pcb Layout

    BLF574 input-rev 3 30RF35 The positions of C1, C19 and C23 are indicated but these capacitors are not connected. Fig 3. BLF574 PCB layout BLF574 output-rev 3 30RF35 C17 C18 C19 001aal306...

  • Page 7: Bill Of Materials

    ATC100B220GT500X ATC100B181JT200X ATC100B6R8CT500X ATC100B150JT500X GRM32DR72E104KW01L GRM32ER72A225KA35 EEV-TG1V102M GRM32ER7YA106KA12L GRM31CR72E104KW03L APT2012CGCK 2743019447 Rev. 01 — 26 January 2010 AN10714 Manufacturer Amidon Micro-Coax Micro-Coax American Technical Ceramics MuRata MuRata American Technical Ceramics American Technical Ceramics American Technical Ceramics American Technical Ceramics American Technical Ceramics...

  • Page 8: Fig 4. Cable Length Definition

    CRCW08059R09FKEA CRCW08055K10FKTA CRCW0805909RFKTA ferrite: BN-61-202 semirigid: 047-25 E22[1]STJ Figure semirigid cable length Cable length definition Rev. 01 — 26 January 2010 AN10714 …continued shows the BLF574 PCB layout. Manufacturer NXP Semiconductors NXP Semiconductors Bourns Vishay Dale Vishay Dale Vishay Dale...

  • Page 9: Fig 5. Photograph Of The Blf574 Circuit Board

    Using the BLF574 in the 88 MHz to 108 MHz FM band Photograph of the BLF574 circuit board range is also reduced using a resistor (R2). Rev. 01 — 26 January 2010 AN10714 Figure 5 shows how 600 W 001aal307 ©...

  • Page 10: Amplifier Alignment

    Using the BLF574 in the 88 MHz to 108 MHz FM band is seen when the characteristic impedance of these transformers is changed. performance can be made more consistent over the band by L(1dB) Rev. 01 — 26 January 2010 AN10714 performance. The modification areas L(1dB) performance can be L(1dB) ©...

  • Page 11: Fig 6. Typical Cw Data; 88 Mhz To 108 Mhz

    Rev. 01 — 26 January 2010 η (%) (dB) 73.3 73.5 71.9 AN10714 = 200 mA and RL (dB) 11.5 001aal308 © NXP B.V. 2010. All rights reserved. 11 of 21...

  • Page 12: Fig 7. Output Gain And Efficiency Variation Under Different Drain Voltage Conditions

    BLF574 at 98 MHz, V = 50 V. Output gain and efficiency comparison for Class-B and Class-AB amplifiers shows the second order harmonic performance. Rev. 01 — 26 January 2010 AN10714 001aal360 001aal309 © NXP B.V. 2010. All rights reserved. 12 of 21...

  • Page 13: Fig 9. Second Order Harmonics As A Function Of Output Power Against Frequency

    Using the BLF574 in the 88 MHz to 108 MHz FM band = 50 V; I = 200 mA. Second order harmonics as a function of output power against frequency Rev. 01 — 26 January 2010 AN10714 001aal310 © NXP B.V. 2010. All rights reserved. 13 of 21...

  • Page 14: Input And Output Impedance

    2.030 − j1.534 2.032 − j1.410 2.033 − j1.299 2.035 − j1.199 2.037 − j1.108 2.039 − j1.025 Rev. 01 — 26 January 2010 AN10714 Table 3. These are generated from Output (Z 4.987 − j0.241 4.947 − j0.477 4.882 − j0.705 4.794 −...

  • Page 15: Base Plate Drawings

    Using the BLF574 in the 88 MHz to 108 MHz FM band (2 ) engraved letter "M" 10.922 37.211 45.847 65.278 76.200 44.32 Rev. 01 — 26 January 2010 AN10714 (2 ) (4 ) 6.350 9.068 12.573 71.120 3.505 6.223 © NXP B.V. 2010. All rights reserved.

  • Page 16: Device Insert

    (2 ) 10.922 65.278 76.200 6.350 11.328 72.644 59.309 23.749 3.556 M2.5 Rev. 01 — 26 January 2010 AN10714 (2 ) (2 ) engraved letter "M" 5.156 10.312 4.978 11.328 10.185 1.143 0.254 10.058 © NXP B.V. 2010. All rights reserved.

  • Page 17: Output Base Plate

    45.847 65.278 76.200 ) added to the effect of current density. Once the from the junction to the device flange for the BLF574 is 0.25 °C/W. If Rev. 01 — 26 January 2010 AN10714 (4 ) 6.350 9.068 12.573 71.120 3.505...

  • Page 18: Fig 14. Blf574 Time-To-Failure

    = 190 °C. = 200 °C. Rev. 01 — 26 January 2010 can be determined based on the operating = 40 °C + 103 °C = 143 °C (10) (11) AN10714 001aal311 © NXP B.V. 2010. All rights reserved. 18 of 21...

  • Page 19: Test Configuration Block Diagram

    ANALYZER METER Rhode & Schwarz E4419B FSEB POWER SENSOR HP8481A TENULINE NARDA 30 dB 3020A 1 kW 10 dB ANZAC RF LOW PASS CH132 FILTER AN10714 POWER SENSOR HP8481A 001aal312 © NXP B.V. 2010. All rights reserved. 19 of 21...

  • Page 20: Legal Information

    11.3 Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Rev. 01 — 26 January 2010 AN10714 © NXP B.V. 2010. All rights reserved. 20 of 21...

  • Page 21: Table Of Contents

    ‘Legal information’. © NXP B.V. 2010. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com AN10714 All rights reserved. Date of release: 26 January 2010 Document identifier: AN10714_1...

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