"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10
"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10
"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10
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<strong>Op</strong>erational Amplifier Parameter Glossary<br />
PARAMETER ABBV UNITS DEFINITION INFO<br />
Output current IO mA<br />
Output impedance Zo Ω<br />
Output resistance ro Ω<br />
Overshoot factor – –<br />
Phase marg<strong>in</strong> Φm °<br />
Power supply rejection ratio PSRR dB<br />
Rise time tr nS<br />
Settl<strong>in</strong>g time ts nS<br />
Short-circuit output current IOS mA<br />
Slew rate SR V/µs<br />
Storage temperature TS °C<br />
Supply current ICC/IDD mA<br />
Supply current (shutdown)<br />
ICC–/<br />
IDD–<br />
SHDN<br />
mA<br />
<strong>The</strong> amount of current that is drawn from <strong>the</strong> op amp output.<br />
Usually specified as an absolute maximum rat<strong>in</strong>g — not for<br />
long term operation at <strong>the</strong> specified level.<br />
<strong>The</strong> frequency dependent small-signal impedance that is<br />
placed <strong>in</strong> series with an ideal amplifier and <strong>the</strong> output term<strong>in</strong>al.<br />
<strong>The</strong> dc resistance that is placed <strong>in</strong> series with an ideal amplifier<br />
and <strong>the</strong> output term<strong>in</strong>al.<br />
<strong>The</strong> ratio of <strong>the</strong> largest deviation of <strong>the</strong> output voltage from its<br />
f<strong>in</strong>al steady-state value to <strong>the</strong> absolute value of <strong>the</strong> step after<br />
a step change at <strong>the</strong> output.<br />
<strong>The</strong> absolute value of <strong>the</strong> open-loop phase shift at <strong>the</strong> frequency<br />
where <strong>the</strong> open-loop amplification first equals one.<br />
<strong>The</strong> absolute value of <strong>the</strong> ratio of <strong>the</strong> change <strong>in</strong> supply voltages<br />
to <strong>the</strong> change <strong>in</strong> <strong>in</strong>put offset voltage. Typically both supply<br />
voltages are varied symmetrically. Unless o<strong>the</strong>rwise<br />
noted, both supply voltages are varied symmetrically.<br />
<strong>The</strong> time required for an output voltage step to change from<br />
<strong>10</strong>% to 90% of its f<strong>in</strong>al value.<br />
With a step change at <strong>the</strong> <strong>in</strong>put, <strong>the</strong> time required for <strong>the</strong> output<br />
voltage to settle with<strong>in</strong> <strong>the</strong> specified error band of <strong>the</strong> f<strong>in</strong>al<br />
value. Also known as total response time, ttot.<br />
<strong>The</strong> maximum cont<strong>in</strong>uous output current available from <strong>the</strong><br />
amplifier with <strong>the</strong> output shorted to ground, to ei<strong>the</strong>r supply, or<br />
to a specified po<strong>in</strong>t. Sometimes a low value series resistor is<br />
specified.<br />
<strong>The</strong> rate of change <strong>in</strong> <strong>the</strong> output voltage with respect to time<br />
for a step change at <strong>the</strong> <strong>in</strong>put.<br />
Temperature over which <strong>the</strong> op amp may be stored for long<br />
periods of time without damage.<br />
<strong>The</strong> current <strong>in</strong>to <strong>the</strong> VCC+/VDD+ or VCC–/VDD– term<strong>in</strong>al of <strong>the</strong><br />
op amp while it is operat<strong>in</strong>g.<br />
<strong>The</strong> current <strong>in</strong>to <strong>the</strong> VCC+/VDD+ or VCC–/VDD– term<strong>in</strong>al of <strong>the</strong><br />
amplifier while it is turned off.<br />
Understand<strong>in</strong>g <strong>Op</strong> Amp Parameters<br />
11.3.8<br />
11.3.15<br />
11.3.<strong>10</strong><br />
11.3.12<br />
Supply rejection ratio kSVR dB (see power supply rejection ratio) 11.3.<strong>10</strong><br />
Supply voltage sensitivity<br />
Supply voltage<br />
Temperature coefficient of<br />
<strong>in</strong>put offset current<br />
kSVS,<br />
∆VCC±,<br />
∆VDD±,<br />
or ∆VIO<br />
VCC/<br />
VDD<br />
αIIO<br />
dB<br />
V<br />
µA/°C<br />
<strong>The</strong> absolute value of <strong>the</strong> ratio of <strong>the</strong> change <strong>in</strong> <strong>in</strong>put offset<br />
voltage to <strong>the</strong> change <strong>in</strong> supply voltages.<br />
Bias voltage applied to <strong>the</strong> op amp power supply p<strong>in</strong>(s). Usually<br />
specified as a ± value, referenced to network ground.<br />
<strong>The</strong> ratio of <strong>the</strong> change <strong>in</strong> <strong>in</strong>put offset current to <strong>the</strong> change <strong>in</strong><br />
free-air temperature. This is an average value for <strong>the</strong> specified<br />
temperature range.<br />
11.3.<strong>10</strong><br />
11.3.2<br />
11-5