User's Manual

User Manual Version 1.1.0 August 23, 2005 Page 7
©Avante International Technology, Inc.
3. DESCRIPTION
3.1 BLOCK DIAGRAM
See Attachment.
3.1.1 Power Supply
Generates 24 VDC power from 120 VAC line voltage.
3.1.2 Voltage Regulation
Generates all necessary voltages for the Smart-Trakker from the 24 VDC power supply voltage.
3.1.3 Clock Generator
Generates the 13.56 MHz clock for the transmitter amplifier. A divided clock signal synchronizes
the microcontroller.
3.1.4 Modulator, Transmitter Amplifier
Modulates the carrier with a digital signal from the microcontroller for data transmission. The
Transmitter Amplifier amplifies the modulated carrier.
3.1.5 Modulation Index, RF Power Regulation
Keeps the Antenna Output Voltage to a software adjustable value. The Modulation Index is
software adjusted after any change in the RF-output power and at large temperature variations.
3.1.6 Receiver, Filter, Demodulator and ADC
The SmartTag IC sends an AM signal. This signal is converted for digital processing by the 12-bit
ADC after filtering, demodulation, and amplification.
3.1.7 Optocouplers
All internal signals are galvanically decoupled by optocouplers.