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參數(shù)資料
| 型號： | ACE9030 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Radio Interface and Twin Synthesiser |
| 中文描述： | 無線接口和雙合成器 |
| 文件頁數(shù)： | 20/39頁 |
| 文件大?。?/td> | 379K |
| 代理商： | ACE9030 |
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ACE9030
C8B to close the loop. An integration is needed to set the VCO onto the correct frequency and other components can then
ensure loop stability. Enough filtering must be provided to give a clock output suitable for all of its uses - microprocessor clock
and audio filtering. A typical loop filter is shown in figure 17.
AFC Amplifier and Discriminator
Fig. 18 Audio Discriminator And AFCOUT Circuit
correct frequency. Further details of this feature are given in
the APPLICATIONS HINTS section. AFCOUT is also used by
the modem in the ACE9050 to receive signalling DATA.
The other path is the audio discriminator which is a purely
digital implementation of the quadrature technique where the
exclusive-OR gate acts as a digital multiplier and compares
two samples of the AFCIN signal separated by a programma-
ble delay to extract the audio and drive the speech and SAT
paths in the ACE9040. The delay length, M, and the crystal
divider, D, are both programmable for the various crystal and
intermediate frequency choices.
After demodulation the audio is low-pass filtered on-chip
to remove the doubled sampling clock and then bandpass
Fig. 17 Typical OSC8 Loop Filter
The input signal to the pin AFCIN is approximately a
squarewave from the second (final) I.F. amplifier-limiter at 450
or 455 kHz and is A.C. coupled to the pin through a capacitor
of typically 1 nF to drive a Schmitt trigger and become a logic
signal. This signal carries the received modulation - speech,
SAT and signalling data. AFCIN is first amplified and limited
and then processed in two separate paths as in figure 18.
One path samples the input signal at 504 kHz, with a clock
generated by a divide-by-two from the CL clock. This sampling
gives a mixed-down output AFCOUT at 54 kHz when the input
is at exactly 450 kHz and otherwise tracks the offset to allow
estimation of the local oscillator error and the crystal error so
that an AFC loop can be built to adjust the crystal to exactly the
C8B
10nF
12k
VDDA
AFCOUT
TO ACE9050
(FOR AFC
SOFTWARE)
AUDIO
TO ACE9040
PRECISION
BANDPASS
FILTER
C2
R1
R2
R3
C1
EXTERNAL FEEDBACK
(BANDPASS FILTER)
XO
AFCIN
CL
FROM CRYSTAL
OSCILATOR
D = 2 OR 3,
FROM BUS
1 2 3 . . . . M
M = 37 OR 40,
FROM BUS
=1
DRIVER
BP
6 dB
ATT'N
L.PASS
FILTER
: D
DQ
DQ
: 2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ACE9040 | Audio Processor Advance Information |
| ACE9050 | System Controller and Data Modem(為蜂窩式手機提供控制和邏輯接口功能的系統(tǒng)控制器和數(shù)據(jù)調(diào)制解調(diào)器) |
| ACE9050 | System Controller and Data Modem Advance Information |
| ACFA-450 | AM CERAMIC FILTERS |
| ACFA-455 | AM CERAMIC FILTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ACE9030IGFP1N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer |
| ACE9030IGFP1R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer |
| ACE9030IGFP2N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer |
| ACE9030IGFP2R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer |
| ACE9030M | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Radio Interface and Twin Synthesiser |
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