XE1201 operation band Author Gael Coron further information, plea

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XE1201 operation band Author Gael Coron further information, plea

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AN1201.02 Application Note
XE1201 operation band
Author Gael Coron further information, please contact
XEMICS
mail: xemics@xemics.com Web: www.xemics.com
Table contents
Introduction External Components Resonator tank circuit Converter tank circuit tank circuit Rfout Matching Network Rfin Matching Network Adjustment Performances Adjustment Spectrum Waveforms Sensitivity Conclusion Annex Schematic Annex Bill Materials
Introduction
This application note describes operations XE1201 315MHz band. XE1201 half-duplex single chip transceiver that normally built work both 433MHz band 390-470MHz band. using Resonator 315MHz (carrier frequency), XE1201 work properly without losing advantages (Low power consumption, Direct Digital Synthesizer function, Synchronizer.). more details about XE1201 transceiver please refer Datasheet Application Information (http://www.xemics.com). values internal capacitors have been measured 433.92MHz. Trimmer capacitors used adjust compensate differences between 433.92MHz carrier frequency (315MHz this application note).
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External Components
order adapt transceiver 315MHz band, values some external components must modified. most important these Resonator; this determines carrier frequency. tank circuits need adapted according this frequency. Also, matching network (RFin RFout) needs modified. Resonator negative resistor created inside XE1201, between pins with parallel parasitic capacitor (Cp). Equivalent Model Resonator shows parallel parasitic capacitance (Transducer Static Capacitance). compensate influence parasitic capacitors Cs), inductor placed parallel with Resonator (Figure
FIGURE RESONATOR ADAPTATION
XE1201
tank circuit external components tank circuit depend carrier frequency. function this tank circuit maximize available power gain. order this; current source created inside XE1201 between pins. This architecture also creates parasitic capacitor (Cp). inductor (L1+L2) placed parallel compensate (Figure Moreover, tank circuit needs resonate carrier frequency defined Resonator. reduce value inductor, capacitor placed parallel with obtain: external components needs fixed Ceq. example 36nH (L=18nH 18nH, common value). possible optimize tank circuit replacing capacitor trimmer. According following equation: external components tank circuits defined L1=L2 18nH C=4pF with trimmer
Resonator
FIGURE RESONATOR CIRCUIT Resonator RO2073A (RFM) designed 315MHz application Transducer Static Capacitance that equals 2.3pF. value internal parallel parasitic capacitor, 3.1pF. value inductor found using Smith Chart (Figure using Resonator RO2073A placing parallel with inductor 47nH, XE1201 transceiver adapted into 315MHz band. 47nH =2.3pF
Cp=3 .1pF
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FIGURE TANK CIRCUIT
RFout Matching Network Topology matching network needed transfer maximum power from RFout antenna. values external components this match dependent carrier frequency.
XE1201
output impedance transceiver XE1201 (RFout) defined parallel model Cp), with Cp=2.4pF output current source (open collector). must biased positive voltage inductor connected Vdd. maximum power transferred antenna upimpedance converter achieved from 600, (RFout impedance =(600 +j0) RFout matching network architecture (Figure shown below:
Converter tank circuit Up-converter tank circuit (Figure serves same purpose tank circuit. However, values external components stay same. L1=L2 18nH C=4pF
with trimmer
FIGURE UP-CONVERTER TANK CIRCUIT
XE1201
tank circuit internal block must connected
XE1201
RFout
FIGURE RFOUT MATCHING NETWORK values external components defined using Smith Chart (Figure FIGURE RFOUT SMITH CHART
following external tank circuit (Figure resonance created between pins; (internal biasing) must grounded external components defined follows: L1=L2 18nH C=4pF with trimmer FIGURE CIRCUIT LOCAL OSCILLATOR TANK
XE1201
Components values: L30nH RFin matching Network C1=3.3pF with trimmer C=5pF C2=3p
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Topology This function allows impedance transformation, well converting single ended input differential transformation. inputs created, being with phase input real impedance block parallel model. converter achieved from local frequency this Application note, carrier frequency 315MHz). Rfin matching network (Figure shown below FIGURE RFIN MATCHING NETWORK determine values external components, different steps need followed. first step transform antenna parallel equivalent schematic (Figure FIGURE SERIAL TRANFORMATION PARALLEL
XE1201
Cinternal
FIGURE RESONANCE CIRCUIT Components values: =22nH =14.2pF With C=2.2pF Cinter=4pF Cp=8pF using Cs=Cp/(1+(1/Q2) Cs=7.9pF
Cserial serial parallel parallel
Rs(1+Q2) Cs/(1+(1/Q2))
1/(RsCs) RpCp
Rserial Cserial defined Rs=50 Cs=1.1pF choice) values components are: Q=9.2 Rp=4282 Cp=1.1pF second step inductor resonate carrier frequency (Figure 10). Furthermore, external capacitor added minimize internal parasitic capacitor effect (its value easily controlled). This component also reduces value inductor inductors have values).
identification, components values Input impedance measure Parallel real part: Rp=1K Parallel capacitor part: Cp=4pF C=C1+C3 C1=Cs/2=4pF C3=Cs/2=4pF C2=2.2pF
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Adjustment Performances
Adjustment test board been made evaluate performance 315MHz. This test board based Evaluation (refer board 433.92MHz) where external components have been modified according calculation. trimmer capacitor also been added RFin matching network block. complete schematic given Annex. first capacitor trim Local Oscillator tank circuit (C10). spectrum analyzer connected Rfout capacitor adjusted obtain carrier frequency 315MHz. perform this operation, XE1201 must receiver. Data present once XE1201 transmitter set. capacitor trimmed obtain maximum power level RFout port. This adjustment important because influence receiver transmitter functionary mode. transmitter mode, capacitor obtain maximum power performance load. receiver mode, C121 adjusted obtain maximum voltage amplitude pins. When trimmers set, board ready transmit receive. performance evaluation done.
view Spectrum Waveforms Verification output using spectrum analyzer make signal. figures show spectrum signal measured transmitter output (RFout). pseudo random sequence applied pin. configuration following: 125kHz frequency deviation output power -5dBm. FIGURE 11a: DEVIATION
Bottom view
figure 11a, markers show value frequency deviation (2*125kHz). With Reference Level 0dBm 10dB/Div, output power -5dBm verified. figure (11b) below, marker shows center frequency: 315MHz. FIGURE 11b: DEVIATION
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figure shows spectrum signal when transmitted. this case, spur 315Mhz minus frequency deviation, 314.875MHz. FIGURE 11c: DEVIATION, TRANSMIT
Sensitivity
sensitivity depends modulation index. following parameter defined according formulas below:
fdev Data Rate
Data_ Rate= fdev
parameter serves modulation index fdev frequency deviation. These equations show that relationship exists between modulation index, frequency deviation data rate. Therefore, sensitivity depends data rate. Figure table below show measurement sensitivity with error rate less than 10E-2 versus Data rate modulation index) with frequency deviation (fdev=125kHz) Table Sensitivity 315MHz Data Rate Sensitivity (Bit/s) 1024 -109dBm 4096 -108dBm 8196 -107dBm 16393 -105dBm 65572 -100dBm
markers show frequency deviation (125kHz) between carrier frequency (315MHz) first harmonic (information) Power level: Local oscillator through 36dBc Fdev image <-30dBc harmonic <50dBc
itiv Sensitivity 1024 4096 8196 16393 65572
Conclusion
observed, even with resonator MHz, transceiver XE1201 works properly. achieve transmission with sensitivity -108dBm, with 4kbit/s, allows transceiver with good communication range. (Similar obtained 433.92MHz).
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Annex Schematic
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Annex Bill Materials
XEMICS Evaluation XE1201 315MHz band
Components References value Form Origin
board SAW1 C3,C4,C6,C7,C11 C121 R3,R4,R5,R6,R7,R8 L1,L2,L3,L4,L5,L6 Conn_10p RF_in, RF_out
VDD-in, VSS-in, TXD, RXD, CLKD
board
Transceiver circuit XTAL Quartz resonator Decoupling capacitor chemical Decoupling capacitor ceramic Decoupling capacitors Adjustment tank trim-capacitor Adjustment tank trim-capacitor Adjustment tank trim-capacitor Adjustment matching RF-in Adaptation matching RF-out Adjustment matching RF-out Adaptation matching RF-in Coupling RF-in capacitor Pull-down resistors digital inputs Inductors tanks Matching RF-out inductor Matching RF-in inductor resonator tuning inductor Connector pins male double sides connectors Semi-rigid coax cable connection Semi-rigid coax cable connection Test pins connectors (digital data) Interboards flat cable Connector pins dipole female Double sides
XE1201 S0409745 RO-2073A (not critical) (not critical) 0805 +/-10%, TZC03Z060A110 TZC03Z060A110 TZC03Z060A110 TZC03Z030A110 0805 +/-0.25pF, TZC03Z030A110 0805 +/-0.25pF, 0805 +/-0.25pF, (not critical) 0805 CS-180-X 0805 CS-330-X 0805 CS-220-XJBC 0805 CS-470-XJBC SUBD barette double SMA-50-3-15/111 SMC-50-0-1/111 41651 dipole female
4.00 MOhm inch 20.5 12.5
TQFP32 SM-2 0805 0805 0805 0805 1206 0805 0805 0805 0805
Xemics Sarnix Philips Philips Murata Murata Murata Murata Philips Philips Philips Philips Philips Coilcraft Coilcraft Coilcraft Coilcraft
Huber&Shuhner Huber&Shuhner
Arting
XEMICS, 2001 rights reserved. Reproduction whole part prohibited without prior written consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice. liability will accepted publisher consequence use. Publication thereof does convey imply license under patent- other industrial intellectual property rights.
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XE1201 operation band Author Gael Coron further information, plea

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