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BLUECORE4-ROM Datasheet(PDF) 49 Page - List of Unclassifed Manufacturers |
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BLUECORE4-ROM Datasheet(HTML) 49 Page - List of Unclassifed Manufacturers |
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49 / 89 page  Device Terminal Descriptions BC41B143A-ds-002Pd This material is subject to CSR’s non-disclosure agreement Production Information © Cambridge Silicon Radio Limited 2005 Page 49 of 89 11 Device Terminal Descriptions 11.1 RF_A and RF_B RF_A and RF_B form a complementary balanced pair. On transmit, their outputs are combined using a balun into the single-ended output required for the antenna. Similarly, on receive their input signals are combined internally. Both terminals present similar complex impedances that require matching networks between them and the balun. Starting from the substrate (chip side), the outputs can each be modelled as an ideal current source in parallel with a lossy resistance and a capacitor. The bond wire can be represented as series inductance. BlueCore4-ROM CSP + _ PA + _ LNA RF Switch RF Switch L2 1.5nH L3 1.5nH R3 10 Ω 0.9pF R2 10 Ω 0.9pF RF_A RF_B Figure 11.1: Circuit RF_A and RF_B |
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