OP-AMP with BJT Design

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Abber Tahir

New Member

• Mar 30, 2013

• #1

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

Well-Known Member

Most Helpful Member

• Mar 30, 2013

• #2

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

 

F

Frank Nash

New Member

• Mar 30, 2013

• #3

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

 

WTP Pepper

Active Member

• Apr 2, 2013

• #4

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.

 

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lebevti

Member

• Apr 12, 2013

• #5

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

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

 

alec_t

Well-Known Member

Most Helpful Member

• Apr 12, 2013

• #6

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