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型號：	RC4192
文件頁數(shù)：	185/1328頁
文件大小：	9519K
代理商：	RC4192

PRODUCT SPECIFICATION

RC4156/RC4157

These equations suggest a tuning sequence where

trimmed via R1 or R2, then Q is trimmed by varying R7

and/or R3. An important advantage of the state-variable

bandpass filter is that Q can be varied without affecting

center frequency

This analysis has assumed ideal op amps operating within

their linear range, which is a valid design approach for a

reasonable range of

and Q. At extremes of

values of Q, the op amp parameters become significant. A

rigorous analysis is very complex, but some factors are par-

ticularly important in designing active filters.

The passive component values should be chosen such

that all op amps are operating within their linear region

for the anticipated range of input signals. Slew rate, out-

put current rating, and common-mode input range must

be considered. For the integrators, the current through

the feedback capacitor (I = C dV/dt) should be included

in the output current computations.

From the equation for Q, it should seem that infinite Q

could be obtained by making R7 zero. But as R7 is made

small, the Q becomes limited by the op amp gain at the

frequency of interest. The effective closed-loop gain is

being increased directly as R7 is made smaller, and the

ratio of open-loop gain to closed-loop gain is becoming

less. The gain and phase error of the filter at high Q is

very dependent on the op amp open-loop gain at w

The attenuation at extremes of frequency is limited by

the op amp gain and unity-gain bandwidth. For integra-

tors, the finite open-loop op amp gain limits the accu-

racy at the low-end. The open-loop roll-off of gain limits

the filter attenuation at high frequency.

The RC4156 quad operational amplifier has much better fre-

quency response than a conventional 741 circuit and is ideal

for active filter use. Natural frequencies of up to 10 kHz are

readily achieved and up to 20 kHz is practical for some con-

figurations. Q can range up to 50 with very good accuracy

and up to 500 with reasonable response. The extra gain of the

RC4156 at high frequencies gives the quad op amp an extra

margin of performance in active-filter circuits.

Schematic Diagram

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
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RC4193	制造商:未知廠家制造商全稱:未知廠家功能描述:
RC4193JG	制造商:未知廠家制造商全稱:未知廠家功能描述:Analog IC
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