All Questions
Tagged with differential analog
43
questions
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Distortion in a negative channel of the differential amplifier THS4505
I designed a single-ended to differential signal amplifier using a tool provided by Texas Instruments:
The source signal passes through a voltage follower (OPA810IDBVR), so the output resistance ...
- 75
0
votes
1
answer
48
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Earphone audio level quiet and microphone not working
I am trying to connect wired earphones to a SIM800 GSM modem so the user can talk over phone calls. After a successful test with a terminal block and hand-soldered connectors, a PCB was designed. The ...
- 5
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3
answers
272
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Proof of half-circuit analysis of perfectly-balanced differential amplifiers
I have seen various approaches to the half-circuit analysis of perfectly-balanced differential amplifiers (see a particular example of a differential circuit at end if desired, but note that this ...
- 1,161
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83
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How to connect cable shield when receiver side powers signal source?
I have element 'A', the receiver, connected to earth, which powers modules 'B' and 'C', the signal sources, unconnected to earth. 'B' sends a differential line signal, and 'C' sends an analog signal. ...
- 179
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49
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Why does the offset voltage have this polarity?
Consider the following from Chapter 3.5.6 of Analysis and Design of Analog Integrated Circuits by Gray, Hurst, Meyer, and Lewis:
As I ask about in a separate question, the authors claim that for some ...
- 1,161
2
votes
6
answers
256
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Why is an offset voltage and an offset current sufficient to represent mismatches in a differential amplifier?
Chapter 3.5.6 of Analysis and Design of Analog Integrated Circuits by Gray, Hurst, Meyer, and Lewis (GHLM) discusses the effect of device mismatches on the behavior of emitter- or source-coupled ...
- 1,161
2
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0
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67
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Transmitting differential video signal to the ADC input
I'm designing a circuit that converts a single-ended analog video signal (f = 10 MHz) to a differential pair and then is processing the data to a digital form. The signal is transmitted through a ...
- 75
1
vote
3
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97
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'Best' topology to measure this weird sensor standard
I am developing an embedded solution to measure and record the analog signal from a PCB Piezotronics pressure sensor. Specifically the Model 124A21.
The sensor has some integrated circuitry to boost ...
- 11
1
vote
2
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282
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Paralleling opamps in a differential input first gain stage
I'm combining opamps to reduce the frontend opamp noise by a factor 0.707. This works in LTSpice, and I understand why it should work. My circuit amplifies a signal that is symmetric around 2.5V and ...
- 166
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2
answers
2k
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Differential pair with source degeneration
[Design of Analog CMOS Integrated Circuits by Razavi]
The author introduces a differential pair with source degenration which helps 'soften' the Vin/Vout characteristics of a differential pair:
He ...
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votes
3
answers
496
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voltage divider inside differential op amp configuration
I'm working on a DIY analog synth based on the CEM3340 chip.
When feeding it 12V at VCC it will output waves at different amplitudes that I'll want to scale to 5V to -5V:
Square: 0-10.7V
Sawtooth: 0-...
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0
answers
60
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Do differential analog output signals "mirror" one another?
Let's say I have a sensor that produces a differential analog output signal. Each signal line is floating relative to ground. Is it typical for that differential signal to be "mirrored" such ...
- 2,036
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1
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59
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Do bases on the 2 transistors in a differential amplifier have graded response for entire range of input voltages they use?
I come from a digital electronics point of view (really I'm a novice in general, but as a novice have mostly been interested in digital electronics), and there, transistors are supposed to act as ...
- 45
3
votes
1
answer
510
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Solid State Relay capacitance causing distortion
I designed a relay network board. The idea is to select one differential measurement points from a high voltage device. In order to do that, I used these solid state relays.
You will see the board ...
- 1,313
0
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2
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246
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Which op-amp should I use to measure voltage across a current sense resistor?
I want to implement current sensing functionality on an MCU (STM32F103 bluepill), but in order to read voltages across the shunts, I would need a differential amplifier to eliminate noise first before ...
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