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Download BDTIC www.BDTIC.com/infineon Application Note No. 064
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A pp l ic a t io n N o t e, R e v . 2. 0 , J a n. 2 00 7 A p p li c a t i o n N o t e N o . 0 6 4 U s i n g th e B C R 4 1 0 W B i a s C on t r o l l er w i th B F P 4 0 5 in Amplifier Circuits BDTIC R F & P r o t e c ti o n D e v i c e s www.BDTIC.com/infineon BDTIC Edition 2007-01-09 Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 2009. All Rights Reserved. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. www.BDTIC.com/infineon Application Note No. 064 Application Note No. 064 Revision History: 2007-01-09, Rev. 2.0 Previous Version: 2000-02-03 Page Subjects (major changes since last revision) All Document layout change BDTIC Trademarks SIEGET® is a registered trademark of Infineon Technologies AG. Application Note 3 www.BDTIC.com/infineon Rev. 2.0, 2007-01-09 Application Note No. 064 Using the BCR410W Bias Controller with BFP405 in Amplifier Circuits 1 Using the BCR410W Bias Controller with BFP405 in Amplifier Circuits Features • Bias controller for RF transistors • Stabilizes collector current • Low voltage drop (110 mV @ IC = 10 mA) • Works from 1.8 V supply voltage on • Unconditionally stable control for many applications • Small outline SOT343 package Applications Amplifier applications for cellular phones, cordless phones, PCS, DECT, W/LANs, PHS, GMS 1800, RF modems and others. 3 2 BDTIC 4 1 AN064_Pin_connection.vsd Figure 1 PIN configuration 1.1 Introduction Low supply voltages in mobile electronic devices increasingly jeopardize your efforts to supply your RF amplifiers with stable bias current. Most of the commonly known circuits cause a substantial voltage drop and hence reduce the already low supply voltage budget. BCR410W was designed to reduce the voltage drop to a minimum and to avoid control oscillations. This application note describes an amplifier circuit with BFP405, but should be easily applicable to other types of transistors. 1.2 Description The BCR410W homes an internal voltage reference that supplies a voltage of 85 mV. This voltage Vref is connected to the positive supply voltage. The Input Signal Vin is compared to Vref and controls the output current Iout. Figure 2 shows the typical application circuit. 1.3 Realisation Transistor T1 is BFP405. Rext was dimensioned to 11 Ω. This results in a collector current of 10 mA in T1. C1 and C2 are dimensioned to be RF-short circuits to block out the RF signals from the DC path. Their value is not critical for DC biasing considerations. Capacitors C3 and C4 are dimensioned to decouple the RF signal. The datasheet of BCR410W gives you the details of how to dimension Rext. In this application there is a voltage drop of 110 mA in the collector path of the RF transistor. Due to internal feedback, this voltage increases for lower collector currents. Figure 3 shows the gain versus frequency. Application Note 4 www.BDTIC.com/infineon Rev. 2.0, 2007-01-09 Application Note No. 064 Using the BCR410W Bias Controller with BFP405 in Amplifier Circuits VS V1: BCR410W C1 = Vref Rext + Lc C2 BDTIC R b RFin C4 C3 RFout T1 AN064_Application_circuit.vsd Figure 2 Application circuit diagram S21 Magnitude 30 25 |S21| / dB 20 15 10 5 0 0,5 1 1,5 2 2,5 f / GHz A N064_Frequency_response.vsd Figure 3 Frequency response The passive components are 0402 sized standard devices. The PCB is FR4, 0.5 mm. To facilitate measurement, the sense terminal of the BCR410W is connected to a pin near the supply connector. Figure 5 displays the position of the various components. Application Note 5 www.BDTIC.com/infineon Rev. 2.0, 2007-01-09 Application Note No. 064 Using the BCR410W Bias Controller with BFP405 in Amplifier Circuits BDTIC AN064_Application_Board_layout.vsd Figure 4 Application Board Layout (actual size: 20 mm x 20 mm) GND Vs Vs Sense C1 C2 Rext V1 RF in R6 Lc C4 RF out T1 C3 AN064_Component_Placement.vsd Figure 5 Component Placement Table 1 List of components Name Value Unit Package Function C1 150 pF 0402 DC block C2 150 pF 0402 DC block C3 150 pF 0402 RF decoupling C4 150 pF 0402 RF decoupling Lc 100 nH 0402 RF choke Rext 11 Ω 0402 Sense Resistor Rb 1.0 kΩ 0402 Base Resistor Application Note 6 www.BDTIC.com/infineon Rev. 2.0, 2007-01-09 Application Note No. 064 Using the BCR410W Bias Controller with BFP405 in Amplifier Circuits Table 1 List of components (cont’d) Name Value T1 V1 Unit Package Function BFP405 SOT343 RF Transistor BCR410W SOT343 Bias controller BDTIC Application Note 7 www.BDTIC.com/infineon Rev. 2.0, 2007-01-09