Question

EE 213: Linear Circuit Analysis Final Project Strain Gauge Amplifier A Force sensing strain gauge is rate at 2225 N. It is supplied by 11 V source and provides 3mV/V at the rated force. This means that the output of the staring gauge will be 33 mV if the force was 2225 N and -33 mV if the force was -2225N. Design an operation amplifier circuit to convert this voltage range from -33-33 mV to 0-3.3V. One terminal of the strain gauge is connected to the inverting input of the Op-Amp while the other is connected to the non-inverting input. An external power source is used to provide the offset and is connected to non-inverting input. The output of the amplifier is connected to an Analog-to-digital converter (ADC). Construct the Op-Amp circuit. b) Choose the component values and the external source. The design components must have standard values. s Find the voltage ratio Vo/Vi. 1d) If the force is 2225 cos (2001), find the expression for the ADC voltage. e) Simulate the circuit in PSIM.

Answer 1

Given Data: We need to design an op-amp which can convert the voltage range from -33 r 33mV to On 3.3V. all Construct an op-amp Crait : RE SIMIN MWM GUAGE colout Extanat M Vout - (-R2 Vin I RJ Ance External sources. blule need to choose component values and the Vin det R1 = 1K2 ; R2 = 50k. Vout = -50 Wp => Whout -so det Ra = 100.12 ; Rb = 30012 . We need to evaluate the voltage Ratio 40 --50 for the selected values. d) If the force is 2225 cos (2007); the expression for Abc Voltage. Given that for a force of 2285N ; ADC voltage will be 33mV - Therefole output ADC Voltage = 3.3 C05 (2004) -