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參數(shù)資料
| 型號(hào)： | HT9015 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | RF Single Chip for Cordless Phone |
| 中文描述： | 射頻單芯片無(wú)繩電話 |
| 文件頁(yè)數(shù)： | 16/23頁(yè) |
| 文件大小： | 206K |
| 代理商： | HT9015 |
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HT9015
16
April 10, 2000
Preliminary
Limiting IF Amplifier, RSSI (Received Signal
Strength Indicator) and RSSI Comparator
The basic function of the IF amp is to boost
the IF signal and to help handle impulse
noise. The IF limiter applies very high gain to
the IF frequency such that the top and bottom
of the waveform are clipped. This helps in re-
ducing AM and noise intercepted upon recep-
tion. The limiting IF amplifier consists of four
differential amplifiers (Figure 6).
Quadrature detector
Once the signal leaves the IF section, it must
be demodulated so that the baseband signal
can be separated from the IF signal. This is
accomplished by the quadrature detector. A
quadrature detector (Figure 7) uses a 90
phase shifter (C
i
), an L/C tuned circuit, and a
phasecomparatortodemodulateFMsignals.
" #
)
)
)
)
!
1
- . + # + .
!&
A
B
"" + *
1 + " >
1
Figure 6 Limiting IF Amplifier, RSSI and RSSI comparator
! !
)
( .
@
E
! " *
" 4 * 1 " # # & " 3
! , & # . * + "
4 " + *
$
@ > C D
1 + " >
Figure 7 Quadrature detector
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT9020B | Call Progress Tone Detector |
| HT9020 | Call Progress Tone Decoder & ABR Controller |
| HT9020A | Call Progress Tone Decoder & ABR Controller |
| HT9032 | Calling Line Identification Receiver |
| HT9033 | CAS Tone Detector |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT9020 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| HT9020A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| HT9020A(18DIP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020A(18SOIC) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020B | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
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