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MC145750 датащи(PDF) 7 Page - Motorola, Inc

номер детали MC145750
подробное описание детали  QPSK Encoder
Download  12 Pages
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производитель  MOTOROLA [Motorola, Inc]
домашняя страница  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145750 датащи(HTML) 7 Page - Motorola, Inc

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MC145750
MOTOROLA
7
DEVICE DESCRIPTION
π/4–Shift QPSK Encoding
RCR standard (STD–28) specifies the basic configuration
of this modulation scheme as shown in Figure 2. First, serial
data input is converted to Xk/Yk parallel streams. Then its
value is compared with one previous symbol Ik/Qk, respec-
tively, whether or not there is a change of polarity. If there is a
change, result is coded as 1. This two–bit
πr (di–bit) is called
symbol, hence symbol rate is just half of the data input rate to
be modulated.
Phase transitions are determined as shown in Figure 3,
with respect to four di–bit values of Xk, Yk. (As is shown,
there should be at least
π/4 of phase shift in each symbol tim-
ing unlike plain QPSK.) Actual in–phase outputs are fed to a
quadrature modulator circuit, and it is recommended that a
2– to 3–order LPF be used, which may be used as a level
shifter and dc offset compensation circuitry at the same time.
The reference voltage for the DACs is given by connecting
either of DAref1:3 to VDD according to the operating voltage
used. It is preferable not to have this voltage vary, since I/Q
output levels are affected.
Timing Generator
The PLL is intended in order to generate all required timing
signals for the devices. The VCO oscillating at the PN511
pattern rate is utilized when some characteristics are mea-
sured. By pulling MODE0 pin high, the device generates this
sequence. It is a useful simple measurement for the occu-
pied power bandwidth and the out–of–band power level. The
sequence itself can also be monitored at the PNO pin.
This circuit is reset by an external reset signal while the
low–state of DS is not valid for initializing the generator.
START–UP SEQUENCE
To ensure stability and to initialize the internal ROM and
encoder, the start–up sequence should be done at power–
up. Refer to Figure 4.
Di–Bit Input
Xk
Yk
Phase Shift
0
0
0
1
1
0
1
1
π/4
3
π/4
π/4
– 3
π/4
Figure 3. Phase Diagram
Q
00
01
11
10
I
22.5
°
Figure 4. Start–Up Sequence
VDD
REST/PDN
DS
90%
> 100
µs
1 s


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