PMB2400

PMB2400 SIEMENS | Alldatasheet

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Technical content

GSM Receiver Circuit PMB 2400 Preliminary Data Bipolar IC

1 Features

© Heterodyne receiver with demodulator © Downward mixing from 900-MHz receiver band to the base band © Demodulation and generation of a VQ components NS ec © Low mixer noise (about 7 dB) © High intercept point @ Integrated phase shifter ® 60-dB AGC control range p-050-24 © Field strength indication with 70-dB dynamic range © integrated SAW driver © High dynamic range of more than 100 dB © Different demodulation schemes © Completely separated 1st mixer and IF stages with separate power-down capability © Wide input frequency range © Wide iF range from 45 MHz to 90 MHz © P-DSO-24 package © Temperature range - 25 °C to +85 °C

Applications

© Digital mobile radio © GSM-systems Various demodulation schemes, such as FM, FSR, QAM, QPSR, GMSK Space and power saving optimizations of existing discrete demodulator circuits. Type. Ordering code | Package PMB 2400 _ | Q67000-A6024 | P-DSO-24 Siemens Aktiengesellschaft |

PMB 2400 Logic- PLL Synthesizer from Synthesizer and Analog-interfaces

01 Lox Lo2 LO2x

RF six PMB 2400 sor oe 200 GSM Input st Receiver Circuit soa| Baseband Pot PO2 RSSI oc Power Down To Signal From Signat Processing Processing 0107 Figure 2 Pin Configuration Pin Definitions and Functions (top view) Pin Number o 7 [S00 | Quadrature Signal Output 1 24 sored? ‘sbaeo2 2 [SO —_[lnPhase Signal Outpst | por 2 Vs2 C3 2FO 4 inverting Input for Second Local Oscillator Lozx 4 21FOGND2 & Non-inverting input for Second Local Oscillator wo2cs 2wEOLOK & [ASSI [Field Stength Output RSSICd6 19017 Non-inverting IF Input IFIX 7 18 GNO1 8 Inverting IF Input iris vbosix 9 ono2 ex} aeEmst 10 __| FOX [inverted IF Output 1Frox 0 sshoy,, 1 __[1FO_[Non-inverted IF Output ‘sy ocd jubomo 12 __|GND1 [Ground eotcd2 whomox 2 14 [MO [Non-inverted Output of First Mixer | reov 18

21 TGNo2 [Ground 2

22 [P01 [Power Down input

23 Power Down input 2

24 Gain Control Inout

Siemens Aktiengesellschaft 2

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2 System Integration

The basic structure of a mobile receiver built with the Siemens GSM chip set is shown below. The receiver chip PMB 2400 uses the incoming signal from the low noise amplifier to do the down conversion as well as the demodulation and generation of the I- and Q- signals.These signals are fed into the baseband codec PMB 2900. Furthermore the automatic gain control stage of the PMB 2400 compensates the varying signal strength by means of a gain control signal coming from the signal processing circuitry. The evaluation logic for this loop can be fed with an RSS! signal supplied by the PMB 2400. Figure 4 GSM Hand-Set with the PMB 2400 Received re [PMB 2400 | Sonal PMB 2500 ; AUDIO N Gsm Gsm M1 CY Signal Receiver Serial Equalizer Processor Speech Circuit Data Gireuit | Data PMB 2300 PMB 2700 BY pan Gsm [| gsm > [| Lx] EPROM PLL~Synthesizer Controller Data Bus EEPROM Circuit Interface N | i RE_| PMB 2200 PMB 2600 “il CY optionat ransmitter Channet Circuit Codec ADIT: i Processor PMB 2900 Identity Card Pal ocsm Contr} Analog DATA Circuit Nout | Treo | Siemens Aktiengesellschaft 4

3 Functional Description

The input signal SI/SIX and the amplified first local oscillator signal LO1.LO1X are mixed down to an intermediate frequency (IF). The open-collector output of the mixer generates a differential current at pins MO/MOX which is filtered by an external resonant circuit. The resulting voltage drives an on-chip SAW driver, which in turn drives an external SAW filter via the IFO/IFOX output, also open-collector. The second local oscillator signal LO2 LO2X is amplified and fed to a divider, which generates orthogonal signals at half the input frequency. The filtered IF signal reenters the chip through the IFIIFIX input, where it is amplified and mixed down to the final output frequency with each of the orthogonal signals. The resulting in-phase and quadrature signals pass through output drivers and appear at the SO! and SOQ outputs, respectively. The amplification of the IF signal before the second mixer stage is performed by a gain- controlled amplifier, the gain being determined by the voltage at the gain control input GC. The signal amplitude (field strength) at the IFVIFIX input is measured by the monitor circuit, which delivers a corresponding voltage at the RSSI output. Differential signals and symmetrical circuitry are used throughout, except at the signal output. For optimum decoupling, separate ground and supply rails and separate power- down signals are provided for the circuitry before and after the SAW filter. Bias drivers generate internal temperature- and supply voltage- compensated reference voltages required by the various circuit blocks. Switching the power-down inputs PD1, PD2 from HIGH to LOW switches the circuit from its normal operating mode into a standby mode with reduced supply current. Siemens Aktiengesellschaft s

4 Electrical Characteristics

Ta =- 25°C to+85°C Parameter [Limit Vatues | Test [rin [moe |__| Coen Supp Vetage Tand 2 [vs [-05_|7___|v | Input/Output Voltage Vio Vs+05|V Vss7V {any except open collector) 75 Vv Vs27V Open Gaectr Our [Woo [=05 [ver25 |v | Vsss0v Voltage (MO, MOX, IFO, IFOX) [vf-o5 [7s |v | Vses0v Differential input Voltage (any differential input) Tinctn Tenperhra ee oa Sroage Toros es Thermal Resistance (junction to ambient) [Rna | 55 | CW | Operational Range Within the operational range the IC operates as described in the circuit description. The AC/DC characteristics limits are not guaranteed. Supply voltage [vs ea [56 TV Siemens Aktiengeselischaft o

V5=4.5 to 5.5 V; Ta =- 25 to +85 °C; Test circuit 1 Parameter em eee Unit SVSIX Input Level D Ce ee SUSIX Input Frequency a ee ed LO1/.01X Input Level » er eee kD COWLOTX input Frequency 1 [or | | 1080 | ie intermediate Frequency [fe a5 90 | Mae IFIAEXX input Level » [Pn |= | 08m LO2MLO2X Input Level 0 [Pion | =20 [= 10 | om LOZiLO2X Input Frequency 1) [foe 90 180 Me SOVSOO Output Frequency 1) ee CO GC input Voltage 0 v PDWPD2 LOW Voltage) [Vex sO sfe PDVPD2 HIGH Votage [Veow [40 vs 1) Power levels are referred to a resistance of 50 2. Parameter ‘Symbol a Test Condition [min Typ. [max | Total Supply Current Ts 27 Er} mA PO =HIGH in Normal Operation 4) Total Supply Current Tsp BA PD =LOW when Powered Down 4) Signal Input SVSIX Input Resistance cS Input inductance a Max. Input Level ‘Psimaxy ~17 3 -dB Compression at MOX intercept Point [Pe fe am Blocking Level ~iW7 dam 3. dB Attenuation ‘of Wanted Signal at MO X Input Interference Pint = 28 dBm = 98 dBm Interference Level at f= finr at f=(fint tho x2 at MO X input Frequency ee Noise Figure [fa [fe Notes see page 11 Siemens Aktiengesellschaft 7?

AC/DC Characteristics (cont'd) Parameter eer ee | Test Condition Input for First Local Oscillator LO1/LO01X Output of First Mixer (SAW Driver Input) MO/MOX (Open Collector) Resistance [evo [fs ffx Total Output Current Tuot 5 mA Iuox Power Gan fon Sgralmput| Gyo | [8 | [wo 30 Output (SAW Driver Output) IFO/IFOX (Open Collector) Total Output Current Tigo* mA Lieox Power Gain from Output Giro 7 into 1 k2 of First Mixer IF Input IFUFIX Input Resistance a | ax pot Love [ra [| fate Max Input Level re a Co Compression at SO Input for Second Local Oscillator LO2/LO2X input Resistance [Rion [fio faa input Capacitance [Goo [fs oF Input Level {Vice [es [| 200 [Ven Notes see page 11 Siemens Aktiengesellschatt 6

AC/DC Characteristics (cont'd) Parameter a pee [er Test Condition [min. [ye [max | Signal Outputs SOI, SOQ Distortion Factor Pip =~ 89 dBm, Voc =0V Distortion Factor Dso Pig =~ 23 dBm, Voc =2.5 V Field Strength Output RSS! Gain Control Pin GC GC input Voltage [vec Jo [fz fv Power Down Inputs PD1, PD2 LOW Input Current ie [fon [ea | Veo 20.8 HIGH Input Voltage [Veow [a [vs fv Notes for pages 9 to 11 1) Parameters for symmetrical inputs and outputs refer to the differential-mode signal. 2) Input and output impedances are modelled as a resistor in parallel with a capacitor. 3) The total supply current includes the current drawn by open-collector outputs. 4) Fars: = dVassi'dP ie. 5) Foc = dGso/dVec. Siemens Aktiengesellschaft 7

5 Test and Application Circuits

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Gain Control Characteristic co room ff} pT Perey ye oB 7 fo oT tT | tT PP | nt IN Ey ot. IN| FE FEN +a \\ —o + op tJ PIN ot PNT oO otit | Py tt ft 0 02 04 06 08 10 12 16 16 V 20 Vac Fi, 8 Monitor Characteristic od a a a a fee EH eH [Z| od a raeee aeeeee 10 | Se ceSEEESEE 02 [| sL_ i | ~100, ~80 60 “40 -20 dBm 0 %e, Siemens Aktiengesellschatt 1%

Worst Case Signal Levels without Blocking Level Antenna saw Filter: Filter, x 7 TR FET-Pre- Second Output ‘Switch Filter Amplifier Filter AGC Mixer = Oriver On mw ISOI/ HERERO Lee Carte. PMB 2400 Tso Goin -152025 -25205(-20.420)42 -30205 +821 dB 0 e721 -S21 67 63)22 +1821 0 20 +20 AGC sets lowest gain in °F Max. gain is worst case. aa » ln | 74 0 Level a | | Po NST Se : ee : AGC sets highest gain. saree los | Lt ee TT | 109 eS Ue 100 =P? Pte 120 ——— TTsers, Siemens Aktiengesellschatt 13

Worst Case Signal Levels with Blocking Level Antenna SAW Filter Filter UR FET-Pre- Second Output Switch Filter Amplifier Filter AGC Mixer Driver | sory PSHE PHERVAL LPH PHP? Te | Loe oa om Tse Goin 452025 -252051-20.20%2-30205 B21 dB 0 721-521 7.46382 18210 Skid —” i. Ln Level 0}-Blocking level >1.6 MHz 0 Level cl a ee

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-40 -40 ne ee <= | -60 60 80 |. AGC sets gain for=19d8m a”) F wanted signal af 17 Ct eS Max. gain 's worst case hat | -100, +} 4 100 aba | Pp | Pt tt “10 soma" 20 Siemens Aktiengesellschatt 14

6 Package Outlines

‘Miniature Plastic Dual-in-Line Package, P-DSO-24 (SMD) (Small Outlines)

24 B 20 DIN 41870 T17

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