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I have a doubt of a charge amplifier with a piezoelectric sensor
Hello all,I have a question about the charge amplifier with a piezoelectric sensor as shown above.The first image shows a piezoelectric sensor and its equivalent circuit and the second one shows the...
View ArticleXTR117 Output Latching
Hello,When using XTR117 in an application that outputs a 4-20mA signal (under region of concern), but rails at ambient conditions (going to the XTR117 current limit), I observed some of the current...
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why the p-p noise is increased after an opa124 sallen-key filter? (circuit...
the p-p noise of the Vin is typically around 5mV, after the filter, why the noise seems to increase to 10mV, what is wrong?
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Stability of LM101A variable-gain instrumentation amp
After noticing that an attenuating diff amp followed by variable gain was ruining my SNR, I found this circuit from Application Note 31 that simulates with much better noise performance:I built it...
View ArticleINA321 drift
Hi,I am currently using an INA321 Instrumentation amplifier with a Metallux CPS 1010 16Bar Pressure Sensor. However, I am struggling with a drift situation where the voltage I am receiving from the...
View ArticleNo phase reversal of LMV551
Hello team,I got a request from my customer, please find the IC that can replace AD8613AKSG.I think LMV551 could be good choice but I have two concerns, price and performance.For performance, customer...
View Articleafter a low pass filter, an ADC was used to read the data (12 bits, 0-5V). it...
Dear experienced experts:I have tried different kinds of low pass filter (the bandwidth is normally less than 50Hz). But, I cannot make the p-p noise to be less than 5mV. is that small enough?
View ArticleEEG pre-amp selection?
Hi all,I am trying to build a pre-amplifier circuitry for EEG signal (1uVpk-pk@0.5~100Hz), but I am confused with the selections of amplifiers.Will Auto-Zero amplifiers like PGA308 or...
View ArticleLMP91000 problem with RE-WE 700mV setup
Hi,I have a problem with setting 700mV between RE - WE.My settings are: Vsup=2.8V, Vref=Vsup, Internal zero=20%, Bias=24%, polarization positive.The highest differential voltage I get was 560mV. The...
View ArticleXTR300 - Output protection -
Hy,in the darasheet (page 20) is described how to protect the Output of the XTR300.My question is, how much current can the internal protection diode of the ic can handle ? Kind reagrds
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OPAx322 Application Spurs
Hello,An OPA2322AIDR is being using in the attached schematic as a charge amplifier for a piezoelectric receiver array. With the following parameters:Input 50ohm-terminated to ground (i.e. no signal...
View ArticleXTR300 unbalanced supply voltage
Hello,Want to use XTR300 for generate DC voltage between 0 - 37 Vdc for test productPlan to set V- = -3V and V+ = 40VdcData sheet are not clear about unbalanced supply voltage. Tina spice model (from...
View ArticleINA321 rail
we are using ina321 for lowside current measurement ( 3.0V supply, Gain 5, ref and Vin- connected to Gnd). With values greater than 0.5V on Vin+ we geht Vout 3.0V instead 2,5V. What could be the reason.
View ArticleOPA1612 power supply sensitivity
Hi - I am using the OPA1612 for the mic preamps on a new mixer. Two problems - one solved. Solved: low freq THD&N was -92dB compared to -110dB above 1K. Changed the 5V LDO from a MCP1824 to a...
View ArticleResistance measurement with TLV3501
Does someone know how to design a simple circuit to measure resistance with TLV3501 or other available OP or comparator?thanks!
View ArticleThermal registance（ψｊｔ） of OPA2132UA/2K5
Hello.In customers of FACTORY Automation using OPA2132UA/2K5(SOIC) .He saids chip surface temperature seems to become hot.He wants to estimate Tj temperature to use a device safely.Therefore, please...
View ArticleLM331 : How to customize a LM331 for a customize frequency range.
Hi,I want to customize the LM331 for a specific frequence range.The customization range is 200Hz to 20 KHz for a voltage input of 0V to 5V. Vcc can be 5V to 12V.Is it possible?? Also please let me...
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Sending and Receiving Signals with an AFE031
Hey,I am working on a point-to-point PLC between two SOMPLC-F28PLC83. I successfully configured both AFE031 via SPI. I am using the AFE in DAC mode to create sine waves of desired CENELEC B frequency,...
View ArticlePGA281 Internal Voltage Range Limits
Hello,I'm trying to make a gain calculator for the PGIA281 so the user can configure the part properly for maximum output signal levels that later feeds a 5V differential input ADC via a THS4531A. The...
View ArticlePower Line Communication in DC Power Line
Hello,I would like to implement power line communication for doing SCI through 24V DC power bar.May I ask if it is possible? What kind of IC or reference design could I use and reference to? Thank you...
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