參數(shù)資料
型號： ZL20200LDF1
廠商： Zarlink Semiconductor Inc.
英文描述： Dual Band IS136/AMPS Transceiver
中文描述： 雙頻IS136/AMPS收發(fā)器
文件頁數(shù)： 11/51頁
文件大小： 485K
代理商： ZL20200LDF1
ZL20200
Data Sheet
11
Zarlink Semiconductor Inc.
1.1.2 AMPS FM
FM demodulation can be performed using the I and Q baseband signals if supported by the baseband. However the
ZL20200 also contains an FM demodulator, the AMPS receive signal path using this mode is shown in detail in
Figure 5 and performance for each stage is summarized in the following table.
The signal path is initially the same as for IS136 with the down conversion to 60 kHz and channel filtering in the
bandpass filter. In FM mode however, the baseband I and Q output stages are disabled, and the 60 kHz IF signal
from the bandpass filter is input to a limiting amplifier and FM discriminator. The FM discriminator consists of a shift
register acting as a delay line. The output of the discriminator is a digital signal which must then be filtered to
recover the audio signal. The discriminator output is therefore routed through the baseband I and Q filters. The
default condition is to use the cascaded I and Q smoothing filters (baseband filter 2) with the cut-off frequency set to
30 kHz. This connection is automatically selected when programming FM mode. There is an option to use the
cascaded switched capacitor filters (baseband filter 1) with the cut off frequency set to 25 kHz to provide extra
filtering. These filters are selected using the PDF and LPC bits in control register 6 and are inserted between the
smoothing filters as shown in Figure 5. The final output stage uses external feedback components to provide a
bandpass filter with a bandwidth of at least 300 Hz to 10 KHz to cover the demodulated audio and control signals.
The feedback components can be modified to change the output level to optimize compatibility with baseband.
Circuit
Block
Gain
(dB)
Filter
Bandwidth
(If Applicable)
Description
IF Input (IF1)
26
max
Differential IF input stage
AGC Amplifier
AGC Amplifier - Gain control range 90 dB. Includes IF input stage gain.
Quadrature
Down-converter
73
Down-conversion to 60 kHz IF
Anti-alias filter
230 kHz
Low pass Butterworth
Band Pass Filter
+/- 16 kHz
Switched capacitor polyphase Chebyshev. Also provides typically 30 dB
image rejection. Centre frequency = 60 kHz. Clock frequency 1.44 MHz
and 720 kHz.
Limiter
Provides limited output to discriminator. Also provides RSSI output.
FM Discriminator
Digital FM discriminator
Baseband filter 2
(I Channel)
30 kHz
Smoothing filter. Low pass Butterworth. Provides filtering of FM
discriminator output.
Baseband filter 1
(I Channel)
25 kHz
Switched capacitor low pass Chebyshev. Clock frequency = 240 kHz.
Provides additional filtering of discriminator output. Selected using PDF and
LPC bits
Baseband filter 1
(Q Channel)
25 kHz
Switched capacitor low pass Chebyshev. Clock frequency = 240 kHz.
Provides additional filtering of discriminator output. Selected using PDF and
LPC bits
Baseband filter 2
(Q Channel)
60 kHz
Smoothing filter. Low pass Butterworth. Provides filtering of FM
discriminator output.
FM Output
30 kHz
Configured using external components as bandpass filter.
Table 2 - AMPS FM Receive Gain and Filter Distribution
相關(guān)PDF資料
PDF描述
ZL20200LDG Dual Band IS136/AMPS Transceiver
ZL20200LDG1 Dual Band IS136/AMPS Transceiver
ZL20200 Dual Band IS136/AMPS Transceiver
ZL20200LCE Dual Band IS136/AMPS Transceiver
ZL20200LCF Dual Band IS136/AMPS Transceiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL20200LDG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Dual Band IS136/AMPS Transceiver
ZL20200LDG1 制造商:Microsemi Corporation 功能描述:
ZL20250 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:2.5G Multimode Transceiver
ZL20250/LCE 制造商:Microsemi Corporation 功能描述:RF TRNSCVR FM 56QFN - Bulk
ZL20250/LCF 制造商:Microsemi Corporation 功能描述:RF TRNSCVR FM 56QFN - Bulk
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