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NJM2232A

FM IF WITH LOG AMPLIFIER

Japan Radio Corporation  

(8) Limitter Amp. Inter Section Filter

The limitter amp, the inter section filter is composed of the resonator

applied with the tuning coil as in the drawing.

Upon designing the RSSI linearity, it is advisable to apply the

resonator coil with no loading Q=55, L=680µH condition, and so

proceed DC cutting before the coil.

(9) Limitter Amplifier

As shown in the drawing, the limitter amp. is the open emitter, and the

limitter amp. output can be obtained by putting adequate resistor to

pin (11).

(10) Quadrature Detecting phase Shifter

In order to detect quadrature, input the signal that has shifted the

phase for 90 degree from pin (15) to RLC paralleled resonator.

The resistor value should be decided to obtain the desired audio

output.

NJM2232A

‹Inter Section Filter›

‹Limitter Amp. Output›

(11) RSSI detecting current shall be shifted from current into voltage by

the internal resistor 32kΩ, And at the same time, please put the

external capacitor value to be able to stay constantly for the desired

time.

‹Phase Shifter›

‹RSSI Output›

Ver.2003-12-09

-5-

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