參數(shù)資料
型號(hào)： TZA3023
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 跨阻放大器
英文描述： SDH/SONET STM4/OC12 transimpedance amplifier
中文描述： SDH / SONET的STM4/OC12阻放大器
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 191K
代理商： TZA3023
2000 Mar 29
6
Philips Semiconductors
Product specification
SDH/SONET STM4/OC12
transimpedance amplifier
TZA3023
AGC
TZA3023 transimpedance amplifier can handle input
currents from 0.5
μ
A to 1.5 mA. This means a dynamic
range of 72 dB. At low input currents, the transimpedance
must be high to get enough output voltage, and the noise
should be low enough to guaranty minimum bit error rate.
At high input currents however, the transimpedance
should be low to avoid pulse width distortion. This means
that the gain of the amplifier has to vary depending on the
input signal level to handle such a wide dynamic range.
This is achieved in the TZA3023 by implementing an
Automatic Gain Control (AGC) loop.
TheAGCloopconsistsofapeakdetector,aholdcapacitor
and a gain control circuit. The peak amplitude of the signal
is detected by the peak detector and it is stored on the hold
capacitor.Thevoltageovertheholdcapacitoriscompared
to a threshold level. The threshold level is set to
10
μ
A (p-p) input current. AGC becomes active only for
input signals larger than the threshold level.
It is disabled for smaller signals. The transimpedance is
then at its maximum value (21 k
differential).
When the AGC is active, the feedback resistor of the
transimpedance amplifier is reduced to keep the output
voltage constant. The transimpedance is regulated from
21 k
at low currents (I < 10
μ
A) to 800
at high currents
(I < 500
μ
A). Above 500
μ
A the transimpedance is at its
minimum and can not be reduced further but the front-end
remains linear until input currents of 1.5 mA.
The upper part of Fig.7 shows the output voltages of the
TZA3023 (OUT and OUTQ) as a function of the DC input
current. In the lower part, the difference of both voltages is
shown. It can be seen from the figure that the output
changes linearly up to 10
μ
A input current where AGC
becomes active. From this point on, AGC tries to keep the
differential output voltage constant around 200 mV for
medium range input currents (input currents <200
μ
A).
The AGC can not regulate any more above 600
μ
A input
current, and the output voltage rises again with the input
current.
handbook, full pagewidth
(V)
1.6
0
600
400
200
MCD914
1
10
2
10
(1)
(2)
(3)
Ii (
μ
A)
Vo(dif)
(mV)
10
3
10
4
1
1.2
1.4
VCC = 3 V
VOUT
VOUTQ
Fig.7 AGC characteristics.
V
o(dif)
= V
OUT
V
OUTQ
.
(1) V
CC
= 3 V.
(2) V
CC
= 3.3 V.
(3) V
CC
= 5 V.
相關(guān)PDF資料
PDF描述
TZA3023T SDH/SONET STM4/OC12 transimpedance amplifier
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TZA3023U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 transimpedance amplifier
TZA3026 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 transimpedance amplifier
TZA3026U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 transimpedance amplifier
TZA3030 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET STM1/OC3 optical receiver
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