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| Direct Vector Modulator PMB 2205 General Description The PMB 2205 is a direct quadrature modulator for use in mobile communication equipment. An external LO signal f0 is fed to the modulator input. This signal is first doubled and then bandpass filtered at 2f0. The filter may be realized by an external tank circuit. Alternatively, a local oscillator operating at 2f0 may be connected to the divider input. This signal is the clock for a 2:1 divider. At the output of the divider orthogonal carriers are provided which are mixed with the baseband modulation signals by two multipliers. The outputs of the multipliers are added and amplified by a linear output stage. The EN pin allows the modulator to be switched in power-down mode. Applications * Vector modulated cellular and cordless systems: GSM, PCN, PCS, PDC, DAMPS, CDMA, WLAN, etc. * Various modulation schemes, such as PM, PSK, FSK, QAM, QPSK, GMSK etc. * Analog systems with FM- and AM modulation * Space and power saving optimizations of existing discrete transmitter circuits Type PMB 2205-T PMB 2205-S Package P-DSO-20-1 (SMD) P-SSOP-20-1 (Shrink SMD) Features * * * * * * * * * * * * * Direct modulation vector modulator Linear modulating inputs Symmetrical circuitry Wide LO-frequency range 120 MHz to 800 MHz LO operation alternatively at transmit frequency or double transmit frequency Generation of orthogonal carriers within a wide frequency range 35-dB carrier rejection, 42-dB SSB rejection 42-dB rejection of third order products 0-dBm linear output power Modulation frequency range 0 to 400 MHz Power-down mode P-DSO-20 or P-SSOP-20 package Temperature range - 25 C to 85 C Tank Circuit or Double Transmit Frequency Inputs LO-Input 120 to 800 MHz LO LO 1 pF PP 0 Enable EN LOI 90 Frequency Doubler PP 1 pF DLO Buffer DLO Divider 2:1 LOI LOI LOQ LOQ I (t ) I I + + + + RF-Output Linear Output Stage E E Q Q PO GND Q (t ) VS GND Block Diagram BIAS V SI LOQ ITB05482 Siemens Aktiengesellschaft 1 |
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