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參數(shù)資料
| 型號： | AD6652 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 65 MSPS IF to Baseband Diversity Receiver |
| 中文描述： | 12位，65 MSPS的IF到基帶分集接收機 |
| 文件頁數(shù)： | 35/76頁 |
| 文件大?。?/td> | 1839K |
| 代理商： | AD6652 |
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AD6652
SECOND-ORDER rCIC FILTE
The rCIC2 filter is a second-order resampling cascaded
integrator comb filter. The resampler is implemented using a
unique technique, which does not require the use of a high-
speed clock, thus simplifying the design and saving power. The
resampler allows for noninteger relationships between the D
CLK and the output data rate. This allows easier implemen
tion of systems that are either multimode or require a master
clock that is not a multiple of the data rate to be used.
Rev. 0 | Page 35 of 76
R
DC
ta-
lowed in
the rCIC2. The resampling factor for the rCIC2 (L) is a 9-bit
integer. When combined with the decimation factor M, a 12-bit
number, the total rate-change can be any fraction in the form of
Interpolation up to 512 and decimation up to 4096 is al
1
2
2
≤
=
rCIC
R
M
L
R
rCIC
The only co
equal to one. This implies that the rC
more.
than or
IC2 decimates by 1 or
a second-order cascaded
cteristics are determined only
).
rt
g
nstraint is that the ratio
L/M
must be less
Resampling is implemented by apparently increasing the input
sample rate by the factor L, using zero stuffing for the new data
samples. Following the resampler is
integrator comb filter. Filter chara
by the fractional rate-change (L/M
The filter can process signals at the full rate of the input po
(65 MHz). The output rate of this stage is given by the followin
equation:
2
2
2
rCIC
SAMP
rCIC
M
SAMP
f
L
f
=
where:
L
rCIC2
and
M
rCIC2
are unsigned integers.
L
rCIC2
,
the interpolation rate, can be from 1 to 512.
M
rCIC2
, the decimation, can be between 1 and 4096.
The stage can be bypassed
frequency response of the
equations:
by setting the decimation to 1/1. The
rCIC2 filter is given by the following
2
2
M
L
z
rCIC
1
2
2
1
2
1
×
)
(
2
×
=
z
L
z
rCIC
rCIC
S
rCIC
H
2
2
2
2
sin
sin
2
1
×
)
(
2
π
×
×
f
π
×
=
SAMP
SAMP
rCIC
rCIC
rCIC
S
f
f
L
f
M
L
f
H
rCIC
Use these equations along with the following filter transfer
equations to calculate the gain and pass-band droop of the
rCIC2. Excessive pass-band droop can be compensated for in
the RCF stage by peaking the pass-band by the inverse of the
roll-off.
c
rCIC2
to the least attenuation without creating an
range, set S
overflow condition. This can be safely accomplished using the
following equation, where
input_level
is the largest fraction of
full scale possible at the input to the AD6652 (normally 1). The
S
rCIC2
scale factor is always used whether or not the rCIC2 is
bypassed.
t must be programmed at 0x92
ess register. The sam
o accommo
e va
date
uld
t 0x92[4:0] t
t
rdware feature.
ha
ass-band d
of the rCIC2 shoul
rCIC2 SCALE FACTOR
The scale factor, S
rCIC2
, is a programmable unsigned 5-bit
between 0 and 31, which serves as an attenuator that can reduce
the gain of the rCIC2 in 6 dB increments. For the best dynami
The S
rCIC2
value must be less than 32 or the interpolation and
decimation rates must be adjusted to validate this equation. The
ceil
function denotes the next whole integer, and the
floor
function denotes the current whole integer. For example, the
ceil
(4.2) is 5 while the
floor
(4.2) is 4. When S
rCIC2
has been
determined for all channels, i
addr
[9:5] of each channel
o be programmed a
als
lue sho
a redundan
The gain and p
lated by the previous equations, as well as the rCIC2 filter
transfer equations. Excessive pass-band droop can be compen-
sated for in the RCF stage by peaking the pass-band by the
inverse of the roll-off.
roop
d be calcu-
×
×
×
+
=
2
log
2
2
2
2
2
2
2
2
2
rCIC
rCIC
rCIC
rCIC
rCIC
rCIC
rCIC
rCIC
L
M
floor
L
M
L
M
floor
M
ceil
S
+
1
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