{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture31-u+741+Operational+Amplifier

# Lecture31-u+741+Operational+Amplifier - ECE 3040...

This preview shows pages 1–6. Sign up to view the full content.

ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 31 Reading: Jaeger 15.11, Notes

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 31 Reading: Jaeger 15.11, Notes
ECE 3040 - Dr. Ying Zhang Georgia Tech What Makes up an Op Amp? The “741” Example Current Mirror Used as an Active Load 2 1 2 4 1 3 2 C C EE C C C C V V I I I I I = = = = = DC Analysis If we can insure that the mirrored currents are equal, I C3 I C1 I C4 I C2 V C2 V C1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
ECE 3040 - Dr. Ying Zhang Georgia Tech What Makes up an Op Amp? The “741” Example Current Mirror Used as an Active Load () L id m L o o id m out id m id m id m C C O id m C C C C C R v g R r r v g v v g v g v g i i i v g i i i i i = = + = + = = = = = 4 2 2 4 2 1 4 1 3 2 2 2 AC Analysis i C3 i C1 i C4 i C2 v C2 =v out v C1 i O L O A D 0.5v id 0.5v id - + - + By using an active load (transistors), we obtain the “Full” gain of a CE stage even though we have a single-ended output. (Remember that for a passive load, resistor, the single ended gain was half the CE gain).
ECE 3040 - Dr. Ying Zhang Georgia Tech What Makes up an Op Amp? The “741” Example Output Stages: “Class A” Output Stage v out So far, the Common Collector output stages (again chosen for very low output impedance) has consisted of a single transistor. This transistor must carry the output current (delivered to R1) and the bias current (I DC ). This results in wasted power in the output stage and possible overheating.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 20

Lecture31-u+741+Operational+Amplifier - ECE 3040...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online