Questions tagged [precision]
Use this tag to indicate that the topic is related to achieving the highest precision for a circuit. Examples include using 1% resistors instead of 5% or 10%. This tag also can be used in relation to measuring precision in a finished circuit.
148 questions
1 vote
1 answer
157 views
Building precision constant current source with Zero-Drift amplifier
I'm trying to build a 2A current source with low noise and lowest drift possible. This circuit will be powered from batteries and the load will be some chemical solution with total resistance of ...
- 169
0 votes
0 answers
64 views
How best to measure the noise level & stability of a precision voltage source output?
Consider a use case for measuring a precision voltage source output's noise and stability levels. Bandwidth is a factor in absolute noise, clearly. As such, measuring with wider bandwidth, is expected ...
- 1,859
1 vote
2 answers
179 views
Best way to make a monostable with (say) 2% precision
For a video "sync combining" circuit, one might want to generate pulses of (horizontal period - HSync width) fairly precisely. If the pulse is too long, horizontal sync might be lost during ...
- 111
4 votes
2 answers
335 views
Star ground or ground pour?
I am making a precision voltage reference now (-10V-10V 0.02ppm) and encountoured a problem of how to ground the system. Some articles (including the article I referred to " Sailer, T. (2015). ...
- 41
9 votes
5 answers
1k views
Is it a good idea to immerse the circuit in an engineered fluid in order to minimize circuit drift
I'm designing an extremely high precision current source. I'd like it's long term drift to be no higher than 1 ppm. This circuit consists of a high stability voltage reference (e.g., LM399), a 20-bit ...
- 201
0 votes
1 answer
99 views
SR830 as LCR meter?
I am wondering if anyone can help gauge how well I can measure some small capacitance (1.5 pF with ~.05 pF steps/resolution) with a SR830 lock-in amplifier versus a dedicated LCR meter such as the ...
- 1
4 votes
7 answers
2k views
Precise Electronic Measurements
I've been looking into various electronic components and noticed rampant 5%, 10%, and even 20% tolerances and accuracies not only in basic components such as capacitors, inductors, and resistors, but ...
- 267
1 vote
1 answer
88 views
Differences between audio ADCs and general-purpose ADCs
From my limited understanding, audio ADCs, and even decoders, also have 16-24 bit resolution and not-so-low sample rates in comparison to high-resolution, low-noise ADCs. It's also worth noting that ...
- 19
0 votes
2 answers
131 views
Internal system timer oscillations on modern computers - how big can it be?
When I synchronize two computers' system clocks up to 0.5 ms precision using NTP protocol implementation, it reports several tens of milliseconds skew in less than 10 minutes, and up to 3000 ms skew ...
- 101
1 vote
1 answer
275 views
How to make an ideal rectifier which can efficiently rectify 3 phase AC for power applications? [closed]
I'm working on a wind turbine project which needs to be able to rectify 3 phase AC with varying voltages. The lowest the input voltage will likely be is 2V, while the higher end will be 27V. I've been ...
- 343
2 votes
2 answers
350 views
External DAC (DAC8568) software calibration
I'm using a 16-bit 8-channel DAC (DAC8568), driven by STM32 MCU. I need to obtain the 0-5V and 0-10V switchable output range, so to achieve that the voltage must be amplified with op-amp. This raises ...
- 73
0 votes
3 answers
239 views
Load regulation of constant current source
LM317HV data sheet provides following reference circuit for use as a "simple, fixed-current regulator" in section 9.2.9. It also specifies typical load regulation of 0.1%. I don't think the ...
- 267
0 votes
1 answer
134 views
Right transimpedence amplifier choice for input range
I have a device that produces a ±30 nA signal and I'd like to measure this to a 0.1 nA precision. Since the currents are so low and I don't have much time to make mistakes, I am planning to use a TIA ...
- 1
3 votes
1 answer
335 views
What is more precise: using an op-amp or internal PGA of an ADC to amplify a low-voltage signal?
I'm wanting to current sense a 10A load with high precision. I'm planning to use a current shunt resistor and then amplify/filter this signal before sending it to an ADC. Which design flow is ...
- 41
2 votes
0 answers
146 views
Voltage-controlled pulse width modulator (PWM) LTC6992 accuracy [closed]
I have to design a voltage sensor for sensing 4000 V highly precisely and for making the PWM. I was surveying the LTC6992. It is simple and quiet, easy to implement, but there is a problem with its ...
- 159