Discussion Overview
The discussion revolves around identifying and mitigating noise in the 7-10.5 kHz range encountered in a high gain current to voltage amplifier setup. Participants explore potential sources of noise, amplifier design considerations, and filtering techniques, focusing on both theoretical and practical aspects of the problem.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- One participant describes their setup involving a high gain current to voltage amplifier connected to coaxial cable, experiencing noise in a specific frequency range.
- Another participant questions whether the amplifier is designed to handle the capacitance of the coax, suggesting it may be unstable and oscillating.
- A different participant asserts that if impedances are matched, the coax should not present as capacitive, requesting further details about the setup.
- The original poster provides details about the amplifier stages, including gains and components, and mentions efforts to filter noise with a capacitor across a feedback resistor.
- Concerns are raised about the need for bandwidth despite the filtering efforts, given the low current being measured.
Areas of Agreement / Disagreement
Participants express differing views on the potential causes of the noise and the effectiveness of the current setup. There is no consensus on the source of the noise or the adequacy of the filtering methods employed.
Contextual Notes
Some assumptions about impedance matching and amplifier stability are not fully explored, and the specific characteristics of the op-amps and their configurations may influence the discussion but remain unresolved.