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參數(shù)資料
| 型號(hào)： | ONET9901TA |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 10.7 Gbps Transimpedance Amplifier |
| 中文描述： | 10.7Gbps 互阻抗放大器 |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大?。?/td> | 424K |
| 代理商： | ONET9901TA |
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SLLS615 APRIL 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
block diagram
The ONET9901TA is a high performance 10.7-Gbps transimpedance amplifier that can be segmented into the
signal path, filter, and offset cancellation block. The signal path consists of a transimpedance amplifier stage,
a voltage amplifier, and an output buffer. The filter circuit provides a filtered VCC for the photodiode. The offset
correction circuit uses an internal low-pass filter to cancel the dc on the input and it provides a signal to monitor
the received signal strength. A simplified block diagram of the ONET9901TA is shown in Figure 1.
VCCI
FILTER
TEST
IN
GND
RSSI
VCCO
OUT+
OUT
Offset
Cancellation
Disable
Transimpedance
Amplifier
Voltage
Amplifier
CML
Output
Buffer
410
1 k
RF
Bandgap
Voltage Reference
and Bias Current
Generation
+
+
Figure 1. Block Diagram
signal path
The first stage of the signal path is a transimpedance amplifier that takes the photodiode current and converts
it to a voltage signal. The second stage is a voltage amplifier that provides additional gain. The output of the
second stage feeds the output buffer and the offset cancellation circuitry. The third and final signal path stage
of the ONET9901TA is the output buffer. The output buffer provides CML outputs with an on-chip 50-
back-termination to VCCO.
filter circuitry
The filter pin provides a filtered VCC for the photodiode bias. The on-chip low-pass filter for the photodiode VCC
is implemented using a filter resistor of 410
and an internal capacitor. If additional filtering is required for the
application, an external capacitor should be connected to the FILTER pin.
offset cancellation and RSSI
The offset cancellation circuitry performs low pass filtering of the output of the voltage amplifier. This senses
the dc offset at the input of the ONET9901TA. The circuitry subtracts current from the input to effectively cancel
the dc. The sensed current is mirrored and is used to generate the RSSI output through an external 10-k
resistor. To disable the offset correction loop, the FILTER pin should be tied to GND.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ONET9901TAY | 功能描述:跨阻抗放大器 Transimpedance Amplifier 10.7 Gbps RoHS:否 制造商:Texas Instruments 封裝 / 箱體:SOIC-14 帶寬:3 MHz 工作電源電壓:36 V 電源電流:5.5 mA 工作溫度范圍:- 40 C to + 85 C 封裝:Tube |
| ONET9901TAY DIE | 制造商:Texas Instruments 功能描述: |
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