參數(shù)資料
型號(hào)： ZL20250LCE
廠商： Zarlink Semiconductor Inc.
英文描述： 2.5G Multimode Transceiver
中文描述： 2.5G的多模收發(fā)器
文件頁(yè)數(shù)： 11/56頁(yè)
文件大?。?/td> 392K
代理商： ZL20250LCE
ZL20250
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
ZL20250 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 30kHz.
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 optimise compatibility with baseband.
A RSSI output is provided. This is a full wave rectified output of the 60 kHz IF and therefore has a high 120 kHz
content. This requires an external low pass filter - typically 10kohm and 2.7nF. There is a trade-off between settling
Circuit
Block
Gain
(dB)
Filter
Bandwidth
(If Applicable)
Description
IF Input (IF0)
26
max
Differential IF input stage
AGC Amplifier
AGC Amplifier - Gain control range 90dB. Includes IF input stage
gain.
Quadrature
Down-converter
73
Down-conversion to 60kHz IF
Anti-alias filter
230 kHz
Low pass Butterworth
Band Pass Filter
+/- 16 kHz
Switched capacitor polyphase Chebyshev. Also provides typically
30dB 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)
60kHz
Smoothing filter. Low pass Butterworth. Provides filtering of FM
discriminator output.
FM Output
30kHz
Configured using external components as bandpass filter.
Table 2 - AMPS FM Receive Gain and Filter Distribution
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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