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OPA607 Datenblatt(PDF) 23 Page - Texas Instruments

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Teilenummer OPA607
Bauteilbeschribung  OPAx607 50-MHz, Low-Power, Rail-to-Rail Output CMOS Operational Amplifier for Cost Sensitive Systems
PDF  48 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA607 Datenblatt(HTML) 23 Page - Texas Instruments

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9.2.1.2 Detailed Design Procedure
Designs that require high bandwidth from a large area detector with relatively high transimpedance-gain benefit
from the low input voltage noise of the OPAx607 devices. Use the Excel™ calculator available at What You Need
To Know About Transimpedance Amplifiers – Part 1 to help with the component selection based on total input
capacitance and CTOT. CTOT is referred as CIN in the calculator. CTOT is the sum of CD, CDIFF, and CCM which is
20 pF. Using this value of CTOT, and the targeted closed-loop bandwidth (f–3dB) of 2 MHz and transimpedance
gain of 100 kΩ results in amplifier GBW of approximately 50 MHz and a feedback capacitance (CF) of 1.1 pF
as shown in Figure 9-2. These results are for a Butterworth response with a Q = 0.707 and a phase margin of
approximately 65° which corresponds to 4.3% overshoot.
Closed-loop TIA Bandwidth (f-3dB)
2.00
MHz
Feedback Resistance (RF)
100.00
kOhm
Input Capacitance (CIN)
20.00
pF
Opamp Gain Bandwidth Product (GBP)
50.27
MHz
Feedback Capacitance (CF)
1.110
pF
Calculator II
Figure 9-2. Results of Inputting Design Parameters in the TIA Calculator
The OPA607's 50 MHz GBW, is suitable for the above design requirements. If the required feedback capacitance
CF comes out to be a very low value capacitor to be practically achievable, a T-Network capacitor circuit as
shown below can be used. A very low capacitor value (CEQ) can be achieved between Port1 and Port2 using
standard value capacitors in a T-Network circuit as shown in Figure 9-3.
1
2
EQ
1
2
T
C
C
C
C
C
C
u
(1)
C
1
C
2
C
T
GND
Port
1
Port
2
Figure 9-3. T-Network
9.2.1.3 Application Curves
Frequency (Hz)
0
-400
10
-360
20
-320
30
-280
40
-240
50
-200
60
-160
70
-120
80
-80
90
-40
100
0
110
40
120
80
10k
100k
1M
10M
100M
TIA_
Gain (dB)
Phase (q)
Figure 9-4. Simulated Closed-Loop Bandwidth of
TIA
Time (50 Psec/Div)
0
1
2
3
4
5
6
OPA6
VOUT
IPD
Figure 9-5. Simulated Time Domain Response
www.ti.com
OPA607, OPA2607
SBOS981J – OCTOBER 2019 – REVISED APRIL 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
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Product Folder Links: OPA607 OPA2607



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