LA1193M_08 SANYO [Sanyo Semicon Device], LA1193M_08 Datasheet - Page 11

• Manufacturer Part Number: LA1193M_08
• Description: High-Performance FM Front End
• Manufacturer: SANYO [Sanyo Semicon Device]

4. Mixer
• Input Format
Note : *Mixer input IMQS is defined as follows :
3D-AGC Sensitivity, ∆f and V 20 Characteristics
— The W-AGC sensitivity is determined by the antenna RF circuit selectivity independently of V 20 .
— The N-AGC sensitivity is determined by the antenna, RF and mixer circuit total selectivity when V 20 is 0.6V or
— The improvement in two-signal sensitivity suppression is the shaded area in the total AGC sensitivity and
The mixer circuit used in this IC is a balanced input/balanced output double balance mixer circuit.
Emitter input
Input impedance : 25Ω
Optimization of the component geometry, emitter
current and bias allow this circuit to achieve the
following performance.
Mixer input usable sensitivity : 15dBµ
Mixer input IMQS* : 90.5dBµ
f r = 98.8MHz, no input
f u1 = 98.8MHz, 1kHz, 30% modulation
f u2 = 99.6MHz, no modulation
greater. It is determined by that selectivity and V 20 when V 20 is over 0.6V.
corresponds to the section occupied by the N-AGC.
Two signal sensitivity
suppression improvement
Desired station
AGC sensitivity
Figure 3
3D-AGC Sensitivity, ∆f and V 20 Characteristics
LA1193M, 1193V
IMQS is the interference 1 and 2 input levels such that when an
interference signal with the same level is input to the mixer and
distortion occurs at the mixer, the generated IM output has a S/N
ratio of 30dB.
V 20 (desired station
field strength)
AGC sensitivity
N-AGC sensitivity
OSC
(Improved by 6.0dBµ over previous products.)
W-AGC sensitivity
Figure 4
MIX
∆F
Mixer Circuit
No.4715-11/22