Designing two differential amplifier circuits

You are required to design two differential amplifier circuits which will convert input signals produced by a sensor in the ranges given below to the required output ranges.
a) Input range 0-1.Y volts to output range 0-10 volts
b) Input range 0-9.Z volts to output range 1-5 volts

Values Y and Z are based on the last two digits of your student number, so if for example, your student number was 123456789 then the required input ranges would be 0 – 1.8 V and 0 – 9.9 V respectively.

The last two digits: 53

Your task is to: –
1. design each circuit, documenting all design calculations.
2. configure simulations of each circuit, using these to verify and demonstrate the correct operation of your circuits.
3. identify practical components which could be used in the manufacture of each circuit, including realistic component values and commercially available electronic devices.
4. produce a full parts list and sample costings.
5. write a brief lab report containing evidence of completion of all tasks above, plus a discussion of your main findings.

Marking Scheme
a) Circuit design and calculations (20 marks)
b) Verification of correct operation – e.g. simulation (20 marks)
c) Component identification, parts list and costing (20 marks)
d) Written report (20 marks)
e) Discussion of findings (20 marks)

Hints and Tips
The differential amplifier circuit is discussed in Week 5 notes. There are worked examples similar to those given above in notes from Weeks 5 and 6.

The output voltage of the above differential amplifier is given by: –

𝑉 = 𝑅2 (𝑉 − 𝑉 )

𝑂𝑢𝑡 𝑅1 2 1

A recommended Proteus test circuit is given below, which you will need to create.

Sample Solution

al of household and industrial waste (20% of solid waste/year is being properly disposed of). In order to battle these environmental problems, the Chinese government has set targets for reducing pollution levels by committing US$6.6b in 2015 in new spending, including the complete shutdown of coal fired power stations. China also signed the UNFCCC’s Paris Agreement in 2015 and agreed to peak its CO2 emissions in 2030 and launch a national cap and trade emissions programme in 2017.

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