參數(shù)資料
型號(hào)： CPS1027-J
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁數(shù)： 42/64頁
文件大小： 870K
代理商： CPS1027-J
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
Data Sheet
January 2002
Agere Systems Inc.
42
7 Application Information
(continued)
Arbitrarily set trap resonance to geometric mean of f
1
and f
3
. Since f
1
= f
3
/3, the geometric mean would be:
At the third overtone frequency, f
3
, it is desirable to have the net impedance of the trap circuit (X
T
) equal to the
impedance of C
2
(X
C2
), i.e.,
Selecting C
3
so that X
C3
<< X
L1
yields,
For a capacitor,
where
ω
= 2
π
f.
For an inductor,
Solving for C
1
, and realizing that L
1
C
1
= 3/
ω
3
2
yields,
Hence, for C
2
= 10 pF, C
1
= 15 pF. Since the impedance of the trap circuit in this example would be equal to the
impedance of a 10 pF capacitor, the negative resistance and supply current curves for C
1
= C
2
= 10 pF at 40 MHz
would apply to this example.
Finally, solving for the inductor value, L
1
,
For the above example, L
1
would be 3.2
μ
H.
f
T
3
------
3
---------------------
3
23 MHz
=
=
=
X
T
X
C2
X
C1
||
X
C3
X
L1
+
(
)
=
=
X
T
X
C2
X
C1
||
X
L1
=
=
X
C
j
ω
C
j
ω
L
- –
=
X
L
=
C
1
3
2
--
C
2
=
L
1
4
π
2
f
2
T
C
2
---------------------------
=
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