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PBL40309 Datasheet(PDF) 5 Page - Ericsson |
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PBL40309 Datasheet(HTML) 5 Page - Ericsson |
5 / 6 page 5 PBL 403 09 DECT RADIO WITH PBL402 15 TRANSCEIVER PBL403 09 together with the transceiver chip PBL402 15 form the base of the radio platform for DECT systems. The transmission part of the chip PBL402 15 has a differential output which can deliver up to 7 dBm. The output power can be programmed in steps. The outputs are of open-collector type. Suitable network between PBL402 15 and PBL403 09 is therefore shunt inductors from the open-collectors to Vcc and series capacitors to the RF inputs of PBL403 09. Suitable value of the capacitors is 1 to 5 pF in order to compensate for the series inductance of the PCB and package. Input impedance of the PBL403 09 is 50 Ω differential. The ideal collector load of the open collector RF output of PBL403 09 is about 11 Ω per side. A matching and combination network to 50 Ω single ended case is shown in fig.9. A shunt capacitor (2.7 pF) transforms each output to 50 Ω. Both 50 Ω outputs are AC coupled and then combined with an LC-CL structure to a 50 Ω single ended output. A power control signal with active low is received from PBL402 15. This signal controls power up/down of the PBL403 09. Supply decoupling consists of high frequency and low frequency decoupling capacitors. The high frequency decoupling capacitor should be placed close to the Vcc pin. PBL 403 09 output PA-ON GND 33p 3.9n 10n 100p 100p 68 n 68 n 1.1p 5.6n 1.1p 5.6n 33p 33p 2.7p 2.7p 1.5p 1.5p 3.9n 1 8 3 6 14 11 25 41 38 39 Vcc Tx- Tx+ PBL 402 15 Figure 9. DECT radio with PBL402 015 transceiver and PA. |
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