Design of Instrumentation amplifier lab experiment

Aim

To construct, test, and perform instrumentation amplifier by using operational amplifier.

Apparatus Required:

1. Op-amplifier Ic- 741
2. Resistor 1k ohm-7
3. Dual RPS (0-30V)
4. Bread board
5. Connecting wires

Theory:

An instrumentation amplifier is an integrated circuit (IC) that is used to amplify a signal. This type of amplifier is in the differential amplifier family because it amplifies the difference between two inputs. The importance of an instrumentation amplifier is that it can reduce unwanted noise that is picked up by the circuit. The ability to reject noise or unwanted signals common to all IC pins is called the common-mode rejection ratio (CMRR). Instrumentation amplifiers are very useful due to their high CMRR. Other characteristics, such as high open loop gain, low DC offset and low drift, make this IC very important in circuit design.

Circuit DiagramThis includes a mercury manometer, an upper arm cuff, a hand inflation bulb with a pressure control valve and requires the use of a stethoscope to listen to the Korotkoff sounds. Relies on the ausculatory technique.

Gain calculation

Vo = (V2-V1) Av

Where Av = R4/R5 (1+(R1+R3/R2))

Procedure:

1. Connections are made as per circuit diagram
2. Check the connection correctly
3. Avoid loose connection and switch the power supply
4. Avoid loose connection and switch the power supply

Tabulation:

Mean Arterial Pressure (MAP)

M A P = (1/3 X SBP) + (2/3XDBP) OR MAP = DBP + ((SBP-DBP/3))

Pulse pressure (PP) = SBP-DBP

Hyper tension-Above normal BP; Hypo tension-Below normal BP

Result:

The instrumentation amplifier is designed and constructed and the output value was checked with theoretical calculation.