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带反馈运算放大器EL2244C的峰值检测器的介绍
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大小:101 |
2009-06-03
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Diodes have long served as adequate rectifiers despite
necessarily large input voltages and poor
accuracy. The most common configuration for a
simple diode peak detector (Figure 1) provides a
mediocre 10% error for very large input voltages
(Figure 2). If the diode is linearized, the necessary
input voltage is only reduced to 1V peak for
the same 10% error (Figure 2). However, development
of high frequency op amps allows feedback
circuitry to provide better accuracy and
more sensitivity at the input. With feedback
(Figure 3), peak detection is feasible at input
voltages as small as 50 mVrms.
necessarily large input voltages and poor
accuracy. The most common configuration for a
simple diode peak detector (Figure 1) provides a
mediocre 10% error for very large input voltages
(Figure 2). If the diode is linearized, the necessary
input voltage is only reduced to 1V peak for
the same 10% error (Figure 2). However, development
of high frequency op amps allows feedback
circuitry to provide better accuracy and
more sensitivity at the input. With feedback
(Figure 3), peak detection is feasible at input
voltages as small as 50 mVrms.
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