callingamit28
Newbie level 2
Hi Guys,
I am designing a discrete instrumentation amplifier from op-amp MCP601 for temperature sensing upto 200 degree C using J-Type Thermocouple. I tried simulating the circuit in pspice but result is not satisfactory. Attached is the circuit and simulation results.
For J-type thermocouple, output voltage at 200 degree C is approx. 10.779mV. Ideally gain of INA is set to 100 times. So at 10.779mV of input, output of INA is approx. 1.0779V and also provided a reference voltage of 1.25V to INA. Hence at 10mV of input, output should be 2.3277V. But simulation results doesnot shows same. Also output voltage doesnot changes when either changing Gain of INA by varying R5 value or also by varying input voltage.
I am designing a discrete instrumentation amplifier from op-amp MCP601 for temperature sensing upto 200 degree C using J-Type Thermocouple. I tried simulating the circuit in pspice but result is not satisfactory. Attached is the circuit and simulation results.
For J-type thermocouple, output voltage at 200 degree C is approx. 10.779mV. Ideally gain of INA is set to 100 times. So at 10.779mV of input, output of INA is approx. 1.0779V and also provided a reference voltage of 1.25V to INA. Hence at 10mV of input, output should be 2.3277V. But simulation results doesnot shows same. Also output voltage doesnot changes when either changing Gain of INA by varying R5 value or also by varying input voltage.