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ZL40122 Datasheet(PDF) 2 Page - Zarlink Semiconductor Inc

Part No. ZL40122
Description  High Speed, Current Feedback Quad Operational Amplifier
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Maker  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
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ZL40122 Datasheet(HTML) 2 Page - Zarlink Semiconductor Inc

 
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ZL40122
Data Sheet
2
Zarlink Semiconductor Inc.
Change Summary
Changes from November 2004 Issue to March 2006 Issue. Page, section, figure and table numbers refer to this
current issue.
Application Notes
Current Feedback Op Amps
Current feedback op amps offer several advantages over voltage feedback amplifiers:
AC bandwidth not dependent on closed loop gain
High Slew Rate
Fast settling time
The architecture of the current feedback opamp consists of a high impedance non-inverting input and a low
impedance inverting input which is always feedback connected. The error current is amplified by a transimpedance
amplifier which can be considered to have gain
where Zo is the DC gain.
It can be shown that the closed loop non-inverting gain is given by
where Av is the DC closed loop gain, Rf is the feedback resistor. The closed loop bandwidth is therefore given by
and for low values of closed loop gain Av depends only on the feedback resistor Rf and not the closed loop gain.
Increasing the value of Rf
Increases closed loop stability
Decreases loop gain
Decreases bandwidth
Reduces gain peaking
Reduces overshoot
Using a resistor value of Rf=510 Ω for Av=+2 V/V gives good stability and bandwidth. However since requirements
for stability and bandwidth vary it may be worth experimentation to find the optimal Rf for a given application.
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