Analog Devices ADRV9002 User Manual

Preliminary Technical Data UG-1828
Rev. PrC | Page 187 of 338
The NB Programmable FIR supports up to 128 taps. Each tap is 24 bits width including the sign-bit, and only 1 set of customized FIR
profiles can be loaded.
Resampler
Resampler in rxnbdem adjusts the sampling phase of the IQ signal or that of the FD signal. This module can be bypassed.
Figure 173 illustrates the functional diagram of the Resampler, the Resampler resamples the incoming received signal, by reconstructing
intermediate samples between every 2 inputs samples according to the re-sample phase parameter, , where
|

|
≤ 0.5 .
In the frequency domain, the ideal digital Resampler has the transfer function as below:
where B
x
is the maximum bandwidth of the input signal. Filtered by the ideal resampling filter, the input signal, x(kT
S
), is converted to the
output signal y(kT
S
) = x((k + μ) × T
S
)
Figure 173. Functional diagram of the Resampler
Scanning the sampling phase μ from 0 to 0.5, the maximum magnitude difference of the frequency transfer function between the
Resampler and the ideal digital resampler is collected and plotted at the upside of Figure 174. The maximum phase error is collected and
plotted at the downside of Figure 174.
The Resampler can be used in both the wideband and narrowband modes.
Figure 174. Maximum Magnitude/Phase Error of the Resampler
Note: The resampler configuration is not supported by current ADRV9001 software release yet.
Round Module
Round in rxnbdem is to map the ADRV9001 internal datapath bit-width to the Rx SSI output. This module can be bypassed if users
choose IQ-22bit mode.
SUB-FIR3 SUB-FIR2
SUB-FIR1
SUB-FIR0
µ
16: S1.15
I, Q
I, Q
24159-131
50
40
30
20
10
0
0.5
0.4
0.3
0.2
0.1
0
MAX MAGNITUDE ERROR (dB)MAX PHASE ERROR (Sample)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
NORMALIZED FREQUENCY (×
Rad/Sample)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
NORMALIZED FREQUENCY (×
Rad/Sample)
MAX MAGNITUDE ERROR FOR µ = [0:0.001:0.5]
MAX PHASE ERROR FOR µ = [0:0.001:0.5]
X = 0.9
Y = 8.558
X = 0.2
Y = 0.00081
X = 0.4
Y = 0.01989
X = 0.6
Y = 0.0407
X = 0.7
Y = 1.302
X = 0.8
Y = 3.459
X = 0.3
Y = 0.004165
X = 0.1
Y = 5.189e-05
X = 0.5
Y = 0.09938
X = 0.9
Y = 0.1648
X = 0.2
Y = 4.893e-05
X = 0.4
Y = 0.0007297
X = 0.6
Y = 0.01102
X = 0.7
Y = 0.03144
X = 0.8
Y = 0.07514
X = 0.3
Y = 0.0002133
X = 0.1
Y = 1.589e-05
X = 0.5
Y = 0.02958
24159-132

Analog Devices ADRV9002 Specifications

General

Brand	Analog Devices
Model	ADRV9002
Category	Transceiver
Language	English