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參數(shù)資料
| 型號(hào)： | 933995410602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDSO16 |
| 封裝： | 3.90 MM, PLASTIC, SOT-109-1, MS-012AC, SO-16 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大小： | 170K |
| 代理商： | 933995410602 |
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Philips Semiconductors
Product specification
SA614A
Low power FM IF system
1997 Nov 07
8
11
12
10
40k
80k
8
40k
V+
9
42k
SR00329
Figure 7. Second Limiter and Quadrature Detector
BPF
SR00330
Figure 8. Feedback Paths
a. Terminating High Impedance Filters with Transformation to Low Impedance
b. Low Impedance Termination and Gain Reduction
BPF
HIGH IMPEDANCE
LOW IMPEDANCE
HIGH IMPEDANCE
BPF
RESISTIVE LOSS INTO BPF
BPF
A
SR00331
Figure 9. Practical Termination
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
614A
430
SR00332
Figure 10. Crystal Input Filter with Ceramic Interstage Filter
Because of the very high gain, bandwidth and input impedance of
the limiters, there is a very real potential for instability at IF
frequencies above 455kHz. The basic phenomenon is shown in
Figure 8. Distributed feedback (capacitance, inductance and
radiated fields) forms a divider from the output of the limiters back to
the inputs (including RF input). If this feedback divider does not
cause attenuation greater than the gain of the forward path, then
oscillation or low level regeneration is likely. If regeneration occurs,
two symptoms may be present: (1)The RSSI output will be high with
no signal input (should nominally be 250mV or lower), and (2) the
demodulated output will demonstrate a threshold. Above a certain
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