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| Receiver/Demodulator Circuit PMB 2401 Preliminary Data General Description The PMB 2401 is a single-chip double-conversion heterodyne PM receiver with phase shifting circuitry for the l/Q-phase demodulation on chip. It also includes the second local oscillator, a gain controlled 2nd IF amplifier, 2 differential operational amplifiers for audio purposes and power-down circuitry. The PMB 2401 is designed for digital mobile telephones according the GSM standard and other digital systems. Application * Digital mobile cellular systems as GSM, PDC, DAMPS * Various demodulation schemes, such as PM, PSK, FSK, QAM, QPSK, GMSK * Space and power saving optimizations of existing discrete demodulator circuits Type PMB 2401-T PMB 2401-S Features Package P-DSO-28-1 (SMD) P-SSOP-28-1 (Shrink, SMD) * Heterodyne receiver with demodulator * Down mixing from 900-MHz receiver band to the base band * Demodulation and generation of l/Q components * Lower mixer noise to 10 dB (SSB) * High intercept point + 2 dBm * Integrated phase shifter for l/Q demodulator * 82-dB AGC range * On-chip second LO oscillator with external tuning circuit * Two differential operational amplifiers * Low power consumption due to highly flexible power-down capability * Wide input frequency range up to 1 GHz * Wide IF range from 35 MHz to 100 MHz * P-DSO-28 package, P-SSOP-28 (Shrink) * Temperature range - 25 C to 85 C MO MO IFI IFI OUTI OUTI + Diff. Op. Amp. INI INI Output Driver SOI SOI 0 Divider by two Divider by two 90 SOQ SOQ Second Mixer Q + Output Driver Diff. Op. Amp. INQ INQ Divider by two LO 2B LO 2E First Mixer SI SI LO-Buffer Amp. LO 1 LO 1 AGC Second Mixer I Standby RF Standby IF V S GND Block Diagram PD 1 PD 2 GC LO 2O OUTQ OUTQ ITB03903 Siemens Aktiengesellschaft 1 |
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