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MRF89XA
2.9.1
TRANSMITTER ARCHITECTURE
In OOK mode, the phase difference between the I and
Figure 2-6 illustrates the transmitter architecture block
diagram. The baseband I and Q signals are digitally
generated by a DDS whose Digital-to-Analog
Converters (DAC) followed by two anti-aliasing low-
pass filters transform the digital signal into analog in-
phase (I) and quadrature (Q) components whose
frequency is the selected frequency deviation, is set
using the FDVAL<7:0> bits from FDEVREG<7:0>.
In FSK mode, the relative phase of I and Q is switched
by the input data between -90° and +90° with continu-
ous phase. The modulation is therefore performed at
this initial stage, because the information contained in
the phase difference will be converted into a frequency
shift when the I and Q signals are up-converted in the
first mixer stage. This first up-conversion stage is dupli-
cated to enhance image rejection. The FSK convention
is such that:
DATA = 1 → f rf + f dev
DATA = 0 → f rf – f dev
Q channels is kept constant (independent of the
transmitted data). Thus, the first stage of up-conversion
creates a fixed frequency signal at the low IF = f dev (this
explains why the transmitted OOK spectrum is offset by
f dev ). OOK Modulation is accomplished by switching the
PA and PA regulator stages ON and OFF. By
convention:
DATA = 1 → PAon
DATA = 0 → PAoff
After the interpolation filters, a set of four mixers
combines the I and Q signals and converts them into a
pair of complex signals at the second intermediate
frequency, equal to one-eighth of the LO frequency, or
one-ninth of the RF frequency. These two new I and Q
signals are then combined and up-converted to the
final RF frequency by two quadrature mixers fed by the
LO signal. The signal is pre-amplified, and then the
transmitter output is driven by a final power amplifier
stage. The I and Q signal details are illustrated in
Figure 2-7 .
FIGURE 2-7:
I(t), Q(t) Signals Overview
1
Fdev
I(t)
Q(t)
DS70622C-page 20
Preliminary
? 2010–2011 Microchip Technology Inc.
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