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ZL40122DCB Datasheet(PDF) 2 Page - Zarlink Semiconductor Inc |
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ZL40122DCB Datasheet(HTML) 2 Page - Zarlink Semiconductor Inc |
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2 / 17 page  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. Page Item Change 1 Updated Ordering Information + = o o f f j Z f Z 1 ) ( + = o o f Z f fR j Av Vin Vout 1 f OL f o o CL R GB R Z f BW = = |
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