1. Common Customer Problem: Op-Amp Output Voltage Swing
By Marek Lis
Sr Application Engineer
Texas Instruments -Tucson

2. Op Amp Output Range Consideration

3. REAL WORLD Outputs

4. Classic Output Stage Common-emitter output Current source driver
Headroom set by
VBE+VCESAT
Unity Gain

5. OPA827 – Classic Output
OPA827
OPA827

6. R-to-R Output Stage Common Collector or Common Drain
Headroom set by VDSsat or VCEsat

7. R-to-R Output Stage Common Collector or Common Drain
Headroom set by VCESAT
Value of RLOAD affects AOL and Output Swing

8. MOSFET Characteristic Curves

9. Achieving Output Swing to the Negative Rail

10. SS Pull Down Cheat Sheet
Part #
Resistor Value
OPA335
40 kΩ
OPA340
7.5 kΩ
OPA343
OPA348
250 kΩ
OPA350
2 kΩ
OPA353
OPA333
20 kΩ

11. Thank you
Marek Lis