All Questions
Tagged with impedance-matching operational-amplifier
23
questions
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Operational amplifier layout- Controlled impedance
In the following picture, we can see a reference layout by Texas instrument for OPA838:
I noticed, in the polygon on the top layer, they have used a specific gap=0.5 mm, I wonder if they used a ...
- 657
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Signal Generator Output Impedance Matching and Floating Ground
I am attempting to recreate a signal generator circuit based on the XR2206, as seen in this video. The schematic uses op-amps for offset cancellation and output amplitude matching. To avoid the need ...
- 45
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votes
3
answers
515
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Voltage Buffer Vs Impedance matching
I am designing an Amplifier circuit for the microphone. For this, I am using a buffer in between two stages for isolation and I am confused between 2 circuits. I know, in voltage buffer circuits, the ...
- 41
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votes
1
answer
784
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Audio line-out to amplifier line-in matching impedance and voltage
I am an electronics hobbyist. After reading online my understanding is that an op-amp buffer or JFET pre-amp can be used to match a medium (lower) input impedance with a high output impedance. In my ...
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2
answers
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Why should we choose a non-inverting op-amp in this context?
I need to build the cheapest amplifier possible knowing Rin, Rch, Vin <= 1 mV, Vout = 12 V and the simplified datasheet of four differents op-amps:
Here is my book's answer:
It is claimed that:
...
user328798
3
votes
3
answers
324
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Single wire electrodynamic pickup preamplifier (transformerless ribbon mic)
I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in ...
- 613
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361
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What is Input Impedance Mismatching of differential Operational Amplifier?
I am new to design differential op-amp.
I am not sure if my circuit will experience input impedance mismatching.
Can anyone explain how input impedance mismatching will happen in differential op-amp? ...
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votes
1
answer
111
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Matching line driver output impedance over wideband
I'm designing a high impedance line tap for 10-10GBASE-T ethernet signaling. In the AFE I have a JFET LNA for high input Z which goes to a var. gain amplifier that is a fully differential ADC driver. ...
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1
answer
837
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Op amps with load impedance matching
I have a THS3491 Op amp, and want to use non-inverting configuration.
Reading through the datasheet, all the specs are defined with \$R_L=100\Omega\$.
So, does this mean I have to attache \$ 49.9\...
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3
votes
1
answer
162
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Voltage Follower Circuit Output Changes based on Load Resistance
I am trying to simulate a circuit which can act as a voltage follower for a headlight. I simulated the circuit using CircuitLab.
I simulated two conditions:
When headlight resistance is 10 Ohm.
...
- 141
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424
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Ferrite antenna impedance matching
I want to use a tuned ferrite antenna with my RTL-SDR. From what I understand at the point of resonance, only the real (resistive) impedance remains. This should be a few ohms for the resistance of ...
- 145
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2
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3k
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how to change output impedance of op amp
I have made a non-inverting op-amp using lf351n with gain of 5 and i need to connect the op-amp to a device with input impedance of 50ohm.I want to know how to make the output impedance of the op-amp ...
- 21
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answer
347
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Choosing RC values for Active LPF to match signal input impedance
I am design a basic 1st order Active LPF with unity gain and am new to this field. How do I make sure that I choose my R and C values to match the input signal impedance or does this not matter? What ...
- 237
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4
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575
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Op-amp ideal characteristics
In a textbook, it says that the ideal op-amp should exhibit following electrical characteristics and one of them is - **
Infinite input resistance (R) so that almost any signal source can
drive ...
- 339
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2
answers
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impedance matching between opamp and microcontroller (or Arduino)
Based on my learning, Maximum power transfer theorem and Impedance matching, the output impedance and the input impedance of the components should be the same. So does the output impedance of an op-...
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