参数资料
型号: TLC32047C
厂商: Texas Instruments, Inc.
英文描述: Wide-Band Analog Interface Circuit
中文描述: 宽带模拟接口电路
文件页数: 33/61页
文件大小: 303K
代理商: TLC32047C
Error = 20 log
sin
π
f/fs
π
f/fs
2–15
Table 2–5. (sin x)/x Roll-Off Error
f (Hz)
fs (Hz)
f = 3000 Hz
(dB)
–2.64
–2.11
–1.44
–0.63
–0.50
–0.35
–0.21
7200
8000
9600
14400
16000
19200
25000
The actual AIC (sin x)/x roll-off is slightly less than the figures above because the AIC has less than 100%
duty cycle hold interval.
2.27 Correction Filter
To externally compensate for the (sin x)/x roll-off of the AIC, a first-order correction filter can be implemented
as shown in Figure 2–8.
+
u (i + 1)
X
y(i + 1)
p1
+
(1 – p1) p2
Z – 1
X
Σ
Figure 2–8. First-Order Correction Filter
The difference equation for this correction filter is:
y
(i + 1)
= p2
(1 – p1)
u
(i + 1)
+ p1
y
(i)
(4)
where the constant p1 determines the pole locations.
The resulting squared magnitude transfer function is:
|
H (f)
|
2
=
(p2)
2
(1–p1)
2
1–2
p1
cos (2
π
f/f
s
) + (p1)
2
(5)
2.28 Correction Results
Table 2-6 shows the optimum p values and the corresponding correction results for 8000-Hz and 9600-Hz
sampling rates (see Figures 5–8, 5–9, and 5–10).
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