BA4116FV Просмотр технического описания (PDF) - ROHM Semiconductor

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BA4116FV

FM IF detector for cordless phones

ROHM Semiconductor 

Communication ICs

FAttached components

BA4116FV

FDetermining the filter amplifier constant (multi-layer recovery band pass filter)

f0: Center frequency

Q: Center frequency f0 / band width BW

A0: I / O gain

The reference resistance R0 is determined as C1 = C2 =

C0.

R0 = 1 / 2πf0 S C0

R1 = R0 S Q / A0

R2 = R0 / [2Q - (A0 / Q)]

R3 = 2R0 S Q

FElectrical characteristic curves

The Filter gain can be adjusted by varying R1, but with the

A0 > 1 design, please be aware that influence from the

open loop characteristic of the amplifier causes offset in

the center frequency f0.

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