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LMS7002M bảng dữ liệu(PDF) 8 Page - List of Unclassifed Manufacturers

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LMS7002M
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LMS7002M
– FPRF MIMO Transceiver IC
tan(
α/2)
tan(
α/2)
Qout
Iout
Iin
Qin
Figure 14: Implementation of IQ phase correction
TX DC Correction
DC offset correction in the TXTSP path is achieved by using the
following equation:
Q
DC
Qin
Qout
I
DC
Iin
Iout
_
_
.
Here, DC_I and DC_Q are programmable DC offset correction
parameters which the BB modem should adjust to minimize the TX DC
and TX LO leakage feed-through. The hardware implementation is
given below.
DC_I
DC_Q
Iin
Qin
Qout
Iout
Figure 15: TX DC offset correction module
RX DC Correction
As mentioned previously, there are multiple reasons for DC to appear at
the RX output. The most difficult to correct, in a static manner, is the
second order distortion (IP2) component which changes with the RX
input level as well as the RX gain set up. Hence, a compensation loop
running in real time is required to track and correct the DC at the RX
output. A simple digital implementation of such a loop is given in Figure
16.
The averaging (COMB) filter calculates the DC of the corrector input
and subtracts it to cancel out the offset. The loop is running all the time
so any change of the RX DC due to the signal level change, RX gain
change or temperature will be tracked and cancelled automatically. The
only programmable parameter in the loop is DCAVG which defines the
averaging window size.
-
Iin
Qin
Qout
Iout
DCAVG
-
Figure 16: RX DC offset correction module
Inverse SINC Filter
The inverse sinc filter compensates for sinx/x amplitude roll off imposed
by the DAC. The filter is designed to compensate from DC to 0.35fs
where fs is the DAC sampling frequency. Impulse and amplitude
responses are shown in Figure 17 and Figure 18.a respectively. Figure
18.b plots the equivalent DAC amplitude response with the inverse sinc
function compensation applied. The in band (0
– 0.35f
s ) amplitude
ripple is less than +/- 0.04 dB.
H( 0) = 0.0101318 = h( 4)
h( 1) = -0.0616455 = h( 3)
h( 2) =
0.855469
Figure 17: INVSINC impulse response
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Frequency [f/fs]
(a)
(b)
Figure 18: INVSINC (a) and equivalent DAC (b) amplitude response
Complex Mixer
The complex mixer used in the RXTSP and TXTSP is designed to
implement the following set of equations:
t
Q
t
I
I
c
in
c
in
out
sin
cos
,
t
Q
t
I
Q
c
in
c
in
out
cos
sin
,
where Iin and Qin are provided from the IQ pre-processing stages while
cosine and sine signals are generated by the NCO. An option to choose
the sign in the mixing equations is implemented which in fact gives the
ability to do up-mixing or down-mixing in both TX and RX chains.
The hardware implementation is shown in Figure 19.
IIN
QIN
+
-/+
+
+/-
IOUT
QOUT
INCO
QNCO
Figure 19: Complex mixer
Numerically Controlled Oscillator
The quadrature carrier signal, required to implement low digital IF, is
generated by the local NCO. The internal NCO design is based on a
DDFS (Direct Digital Frequency Synthesis) algorithm with a 32-bit


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Mô tả tương tự - LMS7002M

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