參數(shù)資料
型號(hào)： TA2123AF
廠商： Toshiba Corporation
英文描述： 1.5V Stereo Headphone Amplifier
中文描述： 1.5V的立體聲耳機(jī)放大器
文件頁(yè)數(shù)： 10/20頁(yè)
文件大小： 427K
代理商： TA2123AF
TA2123AF
2002-10-30
10
(b) AGC circuit
The AGC circuit of bass boost function is realized by the variable impedance circuit. The AGC DET
circuit detects the low frequency level of center amplifier. When this level becomes high, the variable
impedance circuit operates, and this circuit attenuates the input level of center amplifier.
The AGC DET circuit is the current input, so that the output voltage of ADD amplifier is changed into
the current ingredient by resistor Rb and capacitor C5 which are shown in Fig.3. And it is smoothed
and detected by DET circuit (pin 36). And the direct current should not be applied to the AGC IN
circuit, because, as for the circuit, the sensitivity setup is high.
Moreover, the AGC signal level is decreased in case that the resistor R5 is connected with the
capacitor C5 in series. And the AGC point can be changed. But the center amplifier is clipped in the
low frequency in case that the resistor R5 is larger.
(c) Bass boost
The signal flow of bass boost function is as follows, refer to Fig.4.
LPF (internal resistors 2R1 and external capacitor C1)
→
ATT (variable impedance circuit)
→
HPF (BST amplifier)
→
BPF (LPF: internal resistor R4 and external capacitor C3, HPF: external capacitor C4 and internal
resistor R5)
→
Center amplifier
The center amplifier signal becomes the reverse phase, because the phase of audio frequency range
is reversed with two LPFs.
Fig.4
Block diagram of bass boost
20k
2R1
20k
2R1
ATT
C
C
BST
R2 = 100k
R4 = 20k
+
C
C4
R
2
PW
A
PW
C
R
L
27
28
31
34
33
32
20
21
A
2
G
3
(
ω
)
BPF
G
2
(
ω
)
HPF
A
1
G
1
(
ω
)
LPF
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