LMH6609 Datasheet, PDF (13/15 Pages) National Semiconductor (TI) – 900MHz Voltage Feedback Op Amp

Application Section (Continued)
Rectifier
The large bandwidth of the LMH6609 allows for high-speed
rectification. A common rectifier topology is shown in Figure
8. R₁ and R₂ set the gain of the rectifier.
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FIGURE 7. Transimpedance Amplifier
The capacitances are defined as:
• C_D = Equivalent Diode Capacitance
• C_F = Feedback Capacitance
The feedback capacitor is used to give optimum flatness and
stability. As a starting point the feedback capacitance should
be chosen as ¹â„2 of the Diode capacitance. Lower feedback
capacitors will peak frequency response.
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FIGURE 8. Rectifier Topology
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