Ayodhya Weerakoon said: Recently I diagnosed that with the temperature of the IC the reading varies.
Can you give a number? Please specify how much the reading varies.
Is the voltage variation higher than the maximum temperature drift of LM4140…
There is no easy way to measure 1nA change with 250ohm TIA as this implies 250nV resolution - see below.
Changing the input current by 1nA from 1mA to 1.000,001mA would require resolution way below the input voltage noise of LMP7721. Simulating the input…
Part Number: LMP7721 Other Parts Discussed in Thread: TINA-TI , OPA210 , OPA928 Hello,
I am not an electrical engineer but a chemical one. Therefore, my question is probably foolish/basic.
I would like to build a circuit that is able to measure the fC charge…
Part Number: LMP7721 Other Parts Discussed in Thread: INA321 , TINA-TI Hi ti,
I'm designing trans-impedance amplifier with LMP7721.
In my application, the circuit need voltage bias to input.
The circuit is below.
In the simulation, the voltage…
Part Number: LMP91000 Other Parts Discussed in Thread: LMP7721 Hello,
I have Some Questions related 4 Electrodes Gas Sensor. Currently, I am working with LMP91000 & LMP7721.
LMP91000 Configuration: ( WE,CE and RE )
VREF DIVIDER = 50%
RTIA = 14K
Part Number: LMP7721 Other Parts Discussed in Thread: TLV9161 Hi, team.
I'm designing a trans-impedance amplifier using the LMP7721.
The C2 and IG1 is a model of sensor.
The sensor output is about 0.1~10 nA AC current.
The constant bias of 1.2 …
Part Number: LMP7721 Other Parts Discussed in Thread: TINA-TI Hi Team,
Our customer is simulated LMP7721 in TINA-TI for an electrometer application and would like to confirm if the simulation result is correct. According to our customer,
I am using the…
Part Number: LMP7721 Also very low bias current.
Goal to measure voltage across a sensing capacitor, displacement of charge.
1 pA bias current or less
Cin 1 pF differential
very low noise
We wish to use this methodology to reduce the Cin
Part Number: LMP7721 Other Parts Discussed in Thread: LMC6062 , OPA391 Hello,
I am designing isolated loop powered pH measurement circuit, as I read through LMP7721 datasheet, its excellent bias current makes perfect for pH measurement.
Part Number: LMP7721 Hello,
In this question:
RE: the user supplied circuit diagram.
The guard ring appears to be passive (not connected). The data sheet for lmp7721 8.1.1…