参数资料
型号: 4431-T-B1 B 434
厂商: Silicon Laboratories Inc
文件页数: 32/47页
文件大小: 799K
描述: KIT DEV TEST EZRADIOPRO SI4431
标准包装: 1
附件类型: 测试卡,收发器,434MHz
适用于相关产品: EZRadioPRO?
Si4430/31/32-B1
32
Rev 1.1
4. Modulation Options
4.1. Modulation Type
The Si4430/31/32 supports three different modulation options: Gaussian Frequency Shift Keying (GFSK),
Frequency Shift Keying (FSK), and On-Off Keying (OOK). GFSK is the recommended modulation type as it
provides the best performance and cleanest modulation spectrum. Figure 12 demonstrates the difference between
FSK and GFSK for a Data Rate of 64 kbps. The time domain plots demonstrate the effects of the Gaussian filtering.
The frequency domain plots demonstrate the spectral benefit of GFSK over FSK. The type of modulation is
selected with the modtyp[1:0] bits in "Register 71h. Modulation Mode Control 2". Note that it is also possible to
obtain an unmodulated carrier signal by setting modtyp[1:0] = 00.
Figure 12. FSK vs GFSK Spectrums
modtyp[1:0]
Modulation Source
00
Unmodulated Carrier
01
OOK
10
FSK
11
GFSK (enable TX Data CLK when direct mode is used)
TX Modulation Time Domain Waveforms -- FSK vs. GFSK
-1.0
-0.5
0.0
0.5
1.0
-1.5
1.5
50
100    150    200    250    300    350    400    450
0
50
-0.5
0.0
0.5
-1.0
1.0
time, usec
TX Modulation Spectrum -- FSK vs GFSK (Continuous PRBS)
-80
-60
-40
-100
-20
-200    -150    -100
-50
0
50
100
150
200
-250
250
-80
-60
-40
-100
-20
freq, KHz
DataRate
64000.0
TxDev
32000.0
BT_Filter
0.5
ModIndex
1.0
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