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This text was extracted from a Microsoft Word document.
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This is the abbreviated version, containing approximately
57% of the total text.
Frequency generation for
wideband radios with direct conversion receiver and direct launch transmitter
Frequency generation concept for TDMA
wideband systems with direct conversion receiver and direct launch transmitter
that reduces remodulation from the transmitter into the main synthesizer.
This paper describes improvements in
the field of adjacent channel power suppression for linear modulated TDMA
system, where direct launch transmitter combined with direct conversion
receiver are incorporated.
To Be Solved
In a direct conversion receiver with
IQ demodulation, the main synthesizer is required to generate frequencies that
are twice as high as the wanted receive band due to the inherent division by
two of the phase shifter .
A proven concept for the direct launch transmitter is to use a (Phase Locked
Loop) PLL with a very high loop frequency  for the TX frequency generation.
This suppresses remodulation from the transmitter into the TX (Voltage Controlled Oscillator) VCO
sufficiently. The reference for this loop is normally the main PLL.
To achieve the required frequency channel spacing, the main loop must have a
low loop frequency . In radios with superhet receivers the main VCO  does
not suffer too much from remodulation, since the main PLL frequency has an
offset to the TX frequency.
In radios with direct conversion receivers, however, the main VCO 
oscillates on the second harmonic of the transmit frequen...