OP-AMP with BJT Design

[Abber Tahir]

Hey guyz I've got a project to design an operational amplifier with bjt using bipolar supply and there should as minimum components with max gain possible.. kindly help ,its about 30 marks!!!

 

[ronsimpson]

Some (many) op-amps have a schematic in the data sheet. The schematic is not exactly how the amplifier is built but close.

Choose a high speed amplifier because the amplifier is simple compared to a high gain (slow) amplifier. You probably should choose an older part. (FJT not MOS)

Good luck

 

[Frank Nash]

DIY Op Amps (c) Nelson Pass, page 5. https://www.firstwatt.com/pdf/art_diy_opamp.pdf

 

[WTP Pepper]

Try reading up on a "Long Tail Pair" using matched transistors. Once you have this sussed then you have solved the majority of problems involving diff amps. I leave to you to work out how the drop the output impedance and give a "single ended" output.

 

[lebevti]

see the book Analog Integrated Circuits, by Gray, 4th ed.

in there is the scehematic for 741 op-amp, a BJT opamp

 

[alec_t]

Are you allowed to have multiple stages in your amp?
Are there any limits on input impedance, voltage, output drive capability?