BC41B143A-ANN-E4 ETC, BC41B143A-ANN-E4 Datasheet - Page 49

• Manufacturer Part Number: BC41B143A-ANN-E4
• Description: Bluecore 4-rom CSP EDR Single Chip Bluetooth v2.0 + EDR System
• Manufacturer: ETC

11 Device Terminal Descriptions
11.1
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.
BC41B143A-ds-002Pd
RF_A and RF_B
PA
+
_
LNA
_
+
This material is subject to CSR’s non-disclosure agreement
Figure 11.1: Circuit RF_A and RF_B
© Cambridge Silicon Radio Limited 2005
Production Information
Switch
Switch
RF
RF
R2
10Ω
R3
10Ω
0.9pF
0.9pF
BlueCore4-ROM CSP
Device Terminal Descriptions
L2
1.5nH
L3
1.5nH
Page 49 of 89
RF_A
RF_B