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参数资料
| 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： | 5/7页 |
| 文件大小： | 82K |
| 代理商： | LA7770 |
LA7770
No.2208–5/7
In the Fig. 6 phase shifter,
Requirements to achieve a 90
° phase shift will be :
ω2L (C1+C2)=1
∴=
ω=
At the tuning point :
1
j
ωC2+
+jwL
1
R
1
j
ωC2+
+jwL
1
R
1
j
ωC1
+
==
ω2L (C1+C2)–1
ω2LC1
–j
1
j
ωCR
1
2
π√L (C1+C2)
1
√L (C1+C2)
V2
V1
=
V2
V1
ω2L (C1+C2)–1
ω2LC1
+
1
j
ωC1R
1
2
√
V2
V1
=
1
ωC1R
1
2
√
=
ωC1R
(5) Meter Drive and Squelch
A forward bias is provided to the meter drive dedicated detector, to enable its detector diode to detect low-level
signals. In addition, a bias canceler is also provided to eliminate the offsetting current in a no-signal mode created
by the forward bias. Furthermore, to broaden the linear operating range, signals are fetched from the 3rd and 5th
stage outputs of the limiter amplifier, for composition together after level detection.
Fig. 7
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