Panasonic BL-C230A

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BL-C230A
4.1.13. RF block
The digital section of RF block consists of transceiver IC & MAC/BB IC(IC601), SDRAM(IC603), Flash ROM(IC602), and
IEEE802.3(u) Ethernet PHY(IC661).
The analog/RF section consists of a 2.4GHz channel for 802.11b/g. The analog/RF section consists of a transceiver IC, a power
amplifier(IC501), and a low noise amplifier(Q501), in addition to matching and filtering elements.
Ethernet-PHY on the RF Board and Ethernet-PHY on the Main Board are connected with a switch and data communications are
performed between CPU and MAC/BB IC.
Analog/RF Section
• a) Transmit
Transceiver IC receives in-phase and quad-phase signal from MAC/BB IC. Frequency is changed by two steps of mixers inside
IC. The 1st mixer outputs 1.6GHz. The 2nd mixer outputs 2.4GHz. The 2.4GHz transmit signal is amplified with a power ampli-
fier.The power amplifier drives a coupler/detector assembly. The Coupler /detector’s function is to sample the transmit signal and
rectify it. The rectified signal is proportional to the output power and is used for power leveling and control.
The RF transmit signal then passes through a dual band switch. This switch enables the connection of the input to external
antenna.
• b) Receive
The 2.4GHz receive signal is transferred in a reverse order from the antenna through the switch. It is amplified by a low noise
amplifier and fed back into MAC/BB IC.
Frequency is changed by two steps of mixers inside IC. The 1st mixer outputs 1.6GHz. The 2nd mixer outputs base-band signal.
MAC/BB IC receives in-phase and quad-phase signal from Transceiver IC.
• Digital Section
1. MAC/BB IC(IC601)
MAC/BB IC implements a half-duplex, Orthogonal Frequency Division Multiplexing (OFDM) base- band processor sup-
porting IEEE802.11b/g data rate.
It provides one MII-compatible interface.
2. SDRAM(IC603)
Operation power supply : +3.3V
Memory size : 64Mbit
Operation : It operates as a work memory of MAC/BB IC.
3. Flash ROM (IC602)
Operation power supply : +3.3V
Memory size : 16Mbit
Access time : 50ns
Operation : The program for CPU operating are stored.
4. Ethernet-PHY(IC661)
Ethernet-PHY is connected to MAC/BB IC by MII interface. By connecting PHY on the Main Board, data is exchanged
between MAC/BB IC as CPU on the Main board.