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Transceiver - - Transmitter
Antenna
TX IN I/Q
PA gain
Base-band
controller
section
VAPC
3-wire bus
Band Select
PAVAPC
TXVCO
TX IN
900
1800/1900
PFD
PA
UHF synthesizer
UHF synthesizer
Figure 5.3. Transmitter block diagram
TX path is a translation loop architecture consisting of an IQ modulator, integrated high power VCO, offset mixer, programmable
divider, PFD, charge pump, and power amplifier with its control circuit.
The device consists of an In-phase and Quadrate (I/Q) modulator within a frequency translation loop designed to perform
frequency up-conversion with high output spectral purity.
Clock source is 26 MHz VCTCXO external instead of XTAL function block active. VCTCXO is more stable over extreme
condition and current saving in standby mode.
– 5-4 –
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