參數(shù)資料
型號(hào)： AD6652XBC
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PBGA256
封裝： 17 X 17 MM, MINI, BGA-256
文件頁(yè)數(shù)： 32/76頁(yè)
文件大小： 1802K
代理商： AD6652XBC
AD6652
Preliminary Technical Data
Rev. PrC | Page 38 of 76
FILTERS
it
bit
lf-band is sent directly to the
nd-
f a
iple
y
wo
ten to all four channels: Channels 0, 1, 2, and
to
s
nel
INTERPOLATING HALF-BAND
The AD6652 has two interpolating half-band FIR filters that
immediately precede the two digital AGCs and follow the four
RCF channel outputs. Each interpolating half-band takes 16-b
I and 16-bit Q data from the preceding RCF and outputs 16-
I and 16-bit Q to the AGC. The half-band and AGC operate
independently of each other, so the AGC can be bypassed, in
which case the output of the ha
output data port. The half-band filters also operate indepe
ently of each other—either one can be enabled or disabled. The
control register for Half-Band A is at address 0x08 and for Half-
Band B is at Address 0x09.
Half-band filters also perform the function of interleaving data
from various RCF channel outputs prior to the actual function
of interpolation. Interleaving of data is allowed even when the
half-band filter is bypassed. This allows the implementation o
polyphase filter by combining the processing power of mult
channels to act upon a single carrier. This is accomplished b
appropriate phasing of the processing channels using one of t
methods:
RCF phase decimation
Start hold-off counter
For example, if two channels of the AD6652 are used to process
one CDMA2000 carrier, RCF filters for both the channels
should be 180° out of phase. This can be done using RCF phase
decimation or an appropriate start hold-off counter followed by
appropriate NCO phase offsets.
Half-band A can lis
3; Channel 0 and 1; or only Channel 0. Half-band B can listen
Channels 2 and 3, or only Channel 2. Each half-band interleave
the channels specified in its control register and interpolates by
two on the combined data from those channels. For one chan
running at twice the chip rate, the half-band can be used to
output channel data at 4 times the chip rate. The frequency
response of the interpolating half-band FIR is shown in
MULTIPLES OF CHIP RATE
0
SPECTRUM OF HALF-BAND
0
1.0
2.0
3.0
3.5
4.0
dB
(|
SPEC
TR
U
M
_C
OEF|)
–20
–40
–60
–70
–80
0.5
1.5
2.5
–10
–30
–50
i
N
3
fSAMP
fCHIP
03198-0-037
Figure 41. Interpolating Half-Band Frequency Response
The SNR of the in
.
The highest error spurs due to f
d-point arithmetic are
e 13-tap interpolating
terpolating half-band is around 149.6 dB
ixe
around 172.9 dB. The coefficients of th
half-band FIR are given in Table 18.
Table 18. Half-Band Coefficients
0
14
0
66
0
309
512
309
0
66
0
14
0
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