(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-