Receiver Path; Frequency Generating Section; Bluetooth/Wlan Section - Motorola MXP600 Manual

MN006362A01-AL
Chapter 2 : Overview
2.3.3

Receiver Path

The receiver section in the radio is based on the DCR (Direct Conversion) technology. The main
concept of this technology is down converting of the RF signal directly into a base band signal,
skipping the intermediate stage of IF signal.
The receiver path includes the following items.
• Duplexer
• Antenna Switch
• RF Switches
• Off Channel Detector and Inverting Schmitt Trigger
• Balanced-Unbalanced Converter (BALUN)
• Limiter
• 2-bit 6dB Discrete Attenuator
• Discrete Front-End Filter
• Low Noise Amplifier (LNA) integrated with Discrete Attenuator and Automatic Gain Control (AGC)
continuous attenuation
• 13 dB (350 MHz) or 12 dB (800 MHz) of Gain with LNA Bypass Option
• Discrete Post-Selector Filter (350 MHz) or SAW Post-Selector Filter (800 MHz)
• RFIC for mixing
• Baseband filtering and internal 55 dB AGC continuous attenuation (inclusive of the internal 10 dB
step attenuator) which consists of all the baseband receive chain and mixer.
2.3.4

Frequency Generating Section

The frequency generating section includes the following components.
• Low Band VCO (350–410 MHz)
• High Band VCO (410–470 MHz) Fractional-N Synthesizer
• Reference Oscillator
• Loop Filter
• Voltage Multiplier
2.4

Bluetooth/WLAN Section

This section provides detailed description on Bluetooth/WLAN in the radio.
The Bluetooth section includes the following main components:
• BT/WiFi Antenna
• RF Connector
• Bandpass Filter
• Switch
• TCXO 38.4 MHz
• Bluetooth and Wi-Fi IC
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