Discussion Overview
The discussion centers around the selection of an operational amplifier (op-amp) for building an integrator circuit that can handle 15 volt, 65 nanosecond pulses at a repetition rate of 100 kHz, with a desired time constant of 20 microseconds. Participants explore the requirements for low input bias current and sufficient bandwidth for the application.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant, Paul, specifies the need for an op-amp that can integrate 65 ns pulses and emphasizes low input bias current to minimize DC drift.
- Another participant questions the feasibility of any op-amp responding to 65 ns pulses and asks for more details about the intended application.
- Paul clarifies that the input pulse is Gaussian in shape, approximating to half a sine wave, and calculates a frequency of 7.69 MHz, suggesting that a suitable op-amp should be available with the required bandwidth and low input current.
- A participant suggests that a standard op-amp might suffice and mentions the TLC27M2AID, which has a 1 pA input bias current and an 800 MHz bandwidth.
- Another participant recommends looking for a Texas Instruments (TI) op-amp with a high gain bandwidth product (GBW).
Areas of Agreement / Disagreement
There is no consensus on the suitability of op-amps for the specified application, with some participants expressing skepticism about the ability of any op-amp to respond to the fast pulse duration while others suggest potential options.
Contextual Notes
Participants have not agreed on the specific requirements for input bias current or bandwidth, and there are unresolved questions about the practical implementation of the integrator circuit with the specified pulse characteristics.
Who May Find This Useful
Electronics engineers, hobbyists working on signal processing applications, and those interested in operational amplifier selection for high-speed applications may find this discussion relevant.