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參數(shù)資料
| 型號： | SA572NG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPANDOR 2CHAN GAIN 16-DIP |
| 標準包裝： | 500 |
| 類型： | 壓縮擴展器 |
| 應用： | 自動電平控制，立體聲擴展器 |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 16-DIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1131 (CN2011-ZH PDF) |
| 其它名稱： | SA572NG-ND SA572NGOS |
SA572
http://onsemi.com
6
Buffer Amplifier
In audio systems, it is desirable to have fast attack time
and slow recovery time for a tone burst input. The fast
attack time reduces transient channel overload but also
causes low-frequency ripple distortion. The low-frequency
ripple distortion can be improved with the slow recovery
time. If different attack times are implemented in
corresponding frequency spectrums in a split band audio
system, high quality performance can be achieved. The
buffer amplifier is designed to make this feature available
with minimum external components. Referring to
Figure 5, the rectifier output current is mirrored into the
input and output of the unipolar buffer amplifier A3 through
Q8, Q9 and Q10. Diodes D11 and D12 improve tracking
accuracy and provide common-mode bias for A3. For a
positive-going input signal, the buffer amplifier acts like a
voltage-follower. Therefore, the output impedance of A3
makes the contribution of capacitor CR to attack time
insignificant. Neglecting diode impedance, the gain Ga(t)
for
DG can be expressed as follows:
Ga(t) + (GaINT * GaFNL)e
*t
tA
) GaFNL
GaINT = Initial Gain
GaFNL = Final Gain
tA = RA CA = 10 kW CA
where
tA is the attack time constant and RA is a 10 kW
internal resistor. Diode D15 opens the feedback loop of A3
for a negative-going signal if the value of capacitor CR is
larger than capacitor CA. The recovery time depends only
on CR RR. If the diode impedance is assumed negligible,
the dynamic gain GR (t) for DG is expressed as follows:
GR(t) + (GRINT * GRFNL)e
*t
tR
) GRFNL
GR(t) + (GRINT * GRFNL)e
*t
tR
) GRFNL
tR = RR CR = 10 kW CR
where
tR is the recovery time constant and RR is a 10 kW
internal resistor. The gain control current is mirrored to the
gain cell through Q14. The low level gain errors due to input
bias current of A2 and A3 can be trimmed through the
tracking trim pin into A3 with a current source of "3.0 mA.
X2
A3
TRACKING
TRIM
IR1
IR2
IQ = 2IR2
V+
IR +
VIN
R
+
Figure 5. Buffer Amplifier Schematic
10kW
Q8
Q9
Q10
Q16
D13
D15
Q14
Q18
D11
D12
CA
CR
Q17
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