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| 型号： | LA7770 |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封装： | DIP-20 |
| 文件页数： | 4/7页 |
| 文件大小： | 82K |
| 代理商： | LA7770 |
LA7770
No.2208–4/7
(3) IF Limiting Amplifier
The limiter amplifier employed is made up of DC feedback-provided 6-stage direct-coupled differential amplifiers.
Simplified, its circuit is represented in Fig. 4 below.
Feedback gain (AV) will be AV=
=
≈
where feedback depth
β =
=
so that the decoupling capacitor C should be made sufficiently
large in capacitance within the operating frequency band to
achieve its low impedance.
1
A
+
β
1
β
A
1+A
β
V2
V1
1
√1+ (ωCR)2
(4) Quadrature Detector
The quadrature detector converts a frequency-modulated signal into a phase-modulated one by passing it through a
phase shifter, and then demodulates it by converting it again into voltage with its phase detector.
The quadrature detector block of the LA7770 is configured as shown in Fig. 5 below.
Fig. 4
Phase Shifter
The phase shifter is an important element of the quadrature detector, and it dictates the detection characteristics of
the latter.
The following phase-shifter-related parameters may be cited.
1. Demodulation output ........... Chiefly QL
2. Distortion Factor .................. Phase shifter linearity and symmetry of S curve
* While the phase shifting linearity may be enhanced with a single tuning circuit by lowering its QL and broaden-
ing its frequency band, its demodulation output will also be lowered in the process.
Fig. 5
Fig. 6
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| LA7775M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Wideband FSK Receiver |
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| LA7783V-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA7784 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Downconverter IC for Digital CATV |
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