參數(shù)資料
型號(hào): TLC32040M
廠商: Texas Instruments, Inc.
英文描述: ANALOG INTERFACE CIRCUIT
中文描述: 模擬接口電路
文件頁(yè)數(shù): 18/30頁(yè)
文件大小: 202K
代理商: TLC32040M
TLC32040M
ANALOG INTERFACE CIRCUIT
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
4–18
Table 3. (sin x)/x Roll-Off
fs(Hz)
(f = 3000 Hz)
(dB)
7200
8000
9600
14400
19200
–2.64
–2.11
–1.44
–0.63
–0.35
20 log
sin
π
f/fs
π
f/fs
Note that the actual AIC (sin x)/x roll-off will be slightly less than the above figures because the AIC has less
than a 100% duty cycle hold interval.
correction filter
To compensate for the (sin x)/x roll-off of the AIC, a first-order correction filter shown below, is recommended.
(1– p1)P2
p1
+
+
Z–1
X
X
u(i + 1)
y(i + 1)
Σ
The difference equation for this correction filter is:
Yi
1
p2(1
p1) (ui
1)
p1 Yi
where the constant p1 determines the pole locations.
The resulting squared magnitude transfer function is:
H (f)
2
=
1 – 2p1 cos(2
π
f/f
s
) + p1
2
p2
2
(1 – p1)
2
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