Texas Instruments | Band pass filtered inverting attenuator circuit (Rev. A) | Application notes | Texas Instruments Band pass filtered inverting attenuator circuit (Rev. A) Application notes

Texas Instruments Band pass filtered inverting attenuator circuit (Rev. A) Application notes
Analog Engineer's Circuit: Amplifiers
SBOA213A – February 2018 – Revised January 2019
Band pass filtered inverting attenuator circuit
Design Goals
Input
Output
Supply
ViMin
ViMax
VoMin
VoMax
Vcc
Vee
Vref
100mVpp
50Vpp
1mVpp
500mVpp
15V
–15V
0V
Design Description
This tunable band-pass attenuator reduces signal level by –40dB over the frequency range from 10Hz to
100kHz. It also allows for independent control of the DC output level. For this design, the pole frequencies
were selected outside the pass band to minimize attenuation within the specified bandwidth range.
C1 1u
R2 1k
R1 100k
+
C2 1.2n
Vi
Vee
Vcc
R3 8.2
++
Vo
U1 OPA1612
C3 68n
Vcc
Vcc 15
Vref 0
Vee 15
Vee
Design Notes
1. If a DC voltage is applied to Vref be sure to check common mode limitations.
2. Keep R3 as small as possible to avoid loading issues while maintaining stability.
3. Keep the frequency of the second pole in the low-pass filter (fp3) at least twice the frequency of the first
low-pass filter pole (fp2).
SBOA213A – February 2018 – Revised January 2019
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Band pass filtered inverting attenuator circuit
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Design Steps
1. Set the passband gain.
2. Set high-pass filter pole frequency (fp1) below fl.
3. Set low-pass filter pole frequency (fp2 and fp3) above fh.
4. Calculate C1 to set the location of fp1.
5. Select components to set fp2 and fp3.
2
Band pass filtered inverting attenuator circuit
SBOA213A – February 2018 – Revised January 2019
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Copyright © 2018–2019, Texas Instruments Incorporated
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Design Simulations
DC Simulation Results
The amplifier will pass DC voltages applied to the noninverting pin up to the common mode limitations of
the op amp (±13V in this design)
AC Simulation Results
-40.00
fh = 100kHz
Gain = -40.5dB
fl = 10Hz
Gain = -40.11dB
Gain (dB)
-45.00
-50.00
-55.00
-60.00
10
1
100
1k
10k
Frequency (Hz)
100k
1MEG
Transient Simulation Results
25.00
Vi
0.00
-25.00
249.86m
Vo
0.00
-248.95m
1.00m
0.00
2.00m
3.00m
Time (s)
SBOA213A – February 2018 – Revised January 2019
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Band pass filtered inverting attenuator circuit
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Design References
See Analog Engineer's Circuit Cookbooks for TI's comprehensive circuit library.
See circuit SPICE simulation file SBOC503.
See TIPD118, www.ti.com/tool/tipd118.
Design Featured Op Amp
OPA1612
Vss
4.5V to 36V
VinCM
Vee+2V to Vcc–2V
Vout
Vee+0.2V to Vcc–0.2V
Vos
100µV
Iq
3.6mA/Ch
Ib
60nA
UGBW
40MHz
SR
27V/µs
#Channels
1, 2
www.ti.com/product/opa1612
Design Alternate Op Amp
OPA172
Vss
4.5V to 36V
VinCM
Vee–100mV to Vcc–2V
Vout
Rail-to-rail
Vos
200µV
Iq
1.6mA/Ch
Ib
8pA
UGBW
10MHz
SR
10V/µs
#Channels
1, 2, 4
www.ti.com/product/opa172
Revision History
4
Revision
Date
A
January 2019
Change
Downscale the title and changed title role to 'Amplifiers'.
Added link to circuit cookbook landing page.
Band pass filtered inverting attenuator circuit
SBOA213A – February 2018 – Revised January 2019
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
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