15. CIRCUIT OPERATION (Handset)
15.1. Construction
The circuit mainly consists of DSP and RF unit as shown in the block diagram.
15.1.1. DSP:IC201
Function
- Battery Low, Power down defect circuit
- Ringer Generation
- Interface circuit
RF unit, speaker, mic, LED, Key scan, LCD, Headset
15.1.2. RF unit
Mainly voice signal is modulated to RF, or it goes the other way.
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