si4021 Silicon Laboratories, si4021 Datasheet - Page 10

• Manufacturer Part Number: si4021
• Description: Si4021 Universal Ism Band Fsk Transmitter
• Manufacturer: Silicon Laboratories

TYPICAL PERFORMANCE DATA
Phase noise measurements in the 868 MHz ISM band
Unmodulated RF Spectrum
The output spectrum is measured at different frequencies. The output is loaded with 50 Ohms through a matching network.
Ref 0 dBm
Samp
Log
10
dB/
VAvg
100
W1 S2
S3 FC
Center 868 MHz
Res BW 10 kHz
Carrier Power
Ref -60.00dBc/Hz
10.00
dB/
Marker
1
2
3
4
AA
1
10 kHz
Trace
2
2
2
2
11:52:47 May 5, 2005
10:26:50 May 5, 2005
(Ref. level: -60 dBc/Hz, 10 dB/div)
50% Charge pump current setting
-11.11 dBm
Type
Spot Freq
Spot Freq
Spot Freq
Spot Freq
Atten
Atten 10 dB
At 868 MHz
0.00 dB
Frequency Offset
VBW 10 kHz
2
Phase Noise
1
5.008 MHz
151 kHz
3
10 kHz
X Axis
1 MHz
Sweep 40.74 ms (2001 pts)
Mkr
L
L
4
Mkr1 868.0010 MHz
-107.11 dBc/Hz
-115.65 dBc/Hz
-76.65 dBc/Hz
-86.95 dBc/Hz
-115.65 dBc/Hz
5.00800 MHz
Span 2 MHz
-12.2 dBm
4
Value
10 MHz
Ref 0 dBm
Samp
Log
10
dB/
VAvg
100
W1 S2
S3 FC
Center 915 MHz
Res BW 10 kHz
Carrier Power
Ref -70.00dBc/Hz
5.00
dB/
Marker
1
2
3
AA
100, 50, 33% Charge pump current settings
10 kHz
Trace
1
2
3
13:30:49 May 5, 2005
10:34:57 May 5, 2005
(Ref. level: -70 dBc/Hz, 5 dB/div)
-11.03 dBm
Type
Spot Freq
Spot Freq
Spot Freq
Atten
Atten 10 dB
At 915 MHz
0.00 dB
Frequency Offset
VBW 10 kHz
Phase Noise
1
1
2
3
X Axis
1 MHz
1 MHz
1 MHz
Sweep 40.74 ms (2001 pts)
Mkr
L
L
1
Mkr1 915.0020 MHz
-101.95 dBc/Hz
-107.05 dBc/Hz
-109.98 dBc/Hz
-101.95 dBc/Hz
1.00000 MHz
IA4221
-14.09 dBm
Span 2 MHz
Value
10 MHz
10