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參數(shù)資料
| 型號(hào)： | WE904 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx單芯片F(xiàn)M收發(fā)器 |
| 文件頁(yè)數(shù)： | 16/39頁(yè) |
| 文件大?。?/td> | 623K |
| 代理商： | WE904 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 23
Rev Date: 2003 May 27
AUTOMATIC FREQUENCY CONTROL (AFC)
In direct conversion, zero-IF receiver system, the frequency difference between receiving RF signal
and the receiver LO produces a beat tone. If this beat tone falls in audio range, it will pass through the
receiver filters and appear as an audible tone at audio output.
The Automatic Frequency Control (AFC) feature tunes the reference crystal oscillator to minimize
frequency offset between receive RF signal and receive LO. The continuous tracking action keeps the
Rx LO at a small distance (<100Hz) away from the Rx RF signal. As the beat tone frequency is now
very low, the baseband DC offset correction circuit and external audio filter can easily reduce the beat
tone to noise level.
The AFC pin 46 provides a DC correction signal corresponding to the amount of frequency offset. The
signal changed the biasing, and hence the capacitance, of the varactor D1.
The RC network (C4, C5, C6, R5 and R6) and the decoupling capacitors (C7 and C8) at AFCC pin
47, determines the attack time of the AFC integration (double) loop. AFC response time is
approximately 16ms.
Schematics of AFC circuit and relevant components
AFC
WE904/905
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WE905 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:0.1 - 1GHx Single Chip FM Transceiver |
| WE9104 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Pulse Telephone Dialer |
| WE9110 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Pulse Telephone Dialer |
| WE9140 | 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140A | 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
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