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| 型号： | LA1784M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | QIP-64 |
| 文件页数： | 17/50页 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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3D AGC Sensitivity Characteristics
No. 6039-24/50
LA1784M
Second-channel
attenuation improvement
Desired station AGC sensitivity
4
3
2
1
F
Narrow AGC sensitivity
V23 (Desired station field strength)
Wide AGC sensitivity
AGC sensitivity
A12075
Figure 6 3D AGC Sensitivity —
f, V
23 characteristics
The wide AGC sensitivity is determined by the antenna and RF circuit selectivity, regardless of V23.
The narrow AGC sensitivity is determined by the following.
The total selectivity of the antenna, RF circuit, and mixer when V23 ≥ 0.5 V
The above selectivity and V23 when V23 < 0.5 V
The improvement in the second-channel attenuation corresponds to the area occupied by the narrow AGC in the
total AGC sensitivity area.
Figure 8 on the next page shows the actual operation of the circuit.
–4
–5
–2
–3
–1
0
50
60
70
80
90
100
110
1
2
3
4
5
The
fu
input
level
at
which
antenna
damping
turns
on
—
dB
f — MHz
f — AGC on Level (ANT input)
A12076
ANT IN
VIN
Second-channel pad
fD = 98.1 MHz
fu = 98.1 MHz +
f
Fig. 6
Fig. 7
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