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參數資料
| 型號： | TZA3013B |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 運動控制電子 |
| 英文描述： | SDH/SONET STM16/OC48 transimpedance amplifier |
| 中文描述： | SDH / SONET的STM16/OC48阻放大器 |
| 文件頁數： | 7/16頁 |
| 文件大小： | 104K |
| 代理商： | TZA3013B |
2001 Feb 26
7
Philips Semiconductors
Product specification
SDH/SONET STM16/OC48
transimpedance amplifier
TZA3013A; TZA3013B
AGC
The TZA3013 transimpedance amplifier can handle input
currents from 6
μ
A to 1.7 mA which is equivalent to a
dynamic range of 49 dB. At low input currents, the
transimpedance must be high to obtain enough output
voltage, and the noise should be low enough to guarantee
a minimum bit error rate. At high input currents however,
the transimpedance should be low to avoid pulse width
distortion. To achieve the wide dynamic range requires the
gain of the amplifier to depend on the level of the input
signal. This is achieved in the TZA3013 by an AGC loop.
The AGC loop comprises a peak detector, a hold capacitor
and a gain control circuit. The peak detector detects the
amplitudeofthesignalandtheholdcapacitorstoresit.The
hold capacitor voltage is compared to a threshold voltage
which corresponds to an input current of 50
μ
A (p-p). The
AGCisonlyactivewhentheinputsignallevelislargerthan
the threshold level and is inactive when the input signal is
smaller than the threshold level.
When the AGC is inactive, the transimpedance is at its
maximum value of 4 k
differential. When the AGC is
active, the feedback resistor value of the transimpedance
amplifier is reduced, reducing its transimpedance, to keep
the output voltage constant. The transimpedance is
regulated from 4 k
at low currents (I
i
< 50
μ
A) to 80
at
high currents (I
i
= 1.7mA). The AGC allows the amplifier to
remainlinearoverthewholeinputcurrentrangecompared
tootherconfigurationswhichclipthelargesignals,suchas
those using Schottky diodes, for example.
ThetophalfofFig.7showstheoutputvoltageatpads OUT
and OUTQ (V
OUT
and V
OUTQ
) as a function of DC input
current (I
I
) at a supply voltage of 3.3 V. The bottom half of
Fig.7 shows the difference between V
OUT
and V
OUTQ
. The
output voltage changes linearly up to an input current of
50
μ
A. At this point and above, the AGC becomes active
and tries to keep the differential output voltage constant,
which is about 220 mV for a large range input current of
<1.7 mA.
handbook, full pagewidth
(V)
3.1
0
300
200
100
MGT104
1
10
2
10
Ii (
μ
A)
Vo(dif)
(mV)
10
4
10
3
2.8
2.9
3.0
VCC = 3.3 V
VOUT
VOUTQ
Fig.7 AGC characteristics.
V
o(dif)
= V
OUT
V
OUTQ
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TZA3013BU | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SDH/SONET STM16/OC48 transimpedance amplifier |
| TZA3014 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5 Gbits/s postamplifier with level detector |
| TZA3014HT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5 Gbits/s postamplifier with level detector |
| TZA3014U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5 Gbits/s postamplifier with level detector |
| TZA3014VH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5 Gbits/s postamplifier with level detector |
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