Designs for Other Frequencies
The same design methodology described above can be applied to other wireless frequency bands. Design
examples and measurement results for the 900 MHz and 2.4 GHz bands are shown in Figures 33 and 34.
100 pF
Vd
0.9 pF
50
Ω
RF
2450
MHz
220 pF
220 nH
GC
RF
10 nH
91
GN
GND
LO
IF
250
MHz
50
Ω
1000 pF
180 nH
IF
15 pF
50
Ω
LO
2200
MHz
Measured results:
Conversion Gain = 10.6 dB
SSB Noise Figure = 7.1 dB
1 dB Compression = -7.0 dB
P3 (Input) = -7 dBm
Operating conditions:
RF Frequency = 900 MHz
IF Frequency = 80 MHz
LO Frequency = 980 MHz
LO-RF Isolation = 21 dB
LO-IF Isolation = 33 dB
RF-IF Isolation = 17 dB
LO Drive Level = -5 dBm
DC Power = 3.0V @ 9 mA
Figure 33. 800-900 MHz Cellular and ISM Band Mixer.
100 pF
Vd
0.5 pF
50
Ω
RF
2450
MHz
100 pF
220 nH
GC
RF
110
Ω,
3 mm
91
GN
GND
LO
IF
250
MHz
50
Ω
500 pF
68 nH
IF
4.7 pF
3.3 nH
50
Ω
LO
2200
MHz
Measured results:
Conversion Gain = 7.7 dB
SSB Noise Figure = 11 dB
1 dB Compression = -8.7 dB
IP3 (Input) = -7 dBm
Operating conditions:
RF Frequency = 2.45 GHz
IF Frequency = 250 MHz
LO Frequency = 2.2 GHz
Figure 34. 2.4 GHz ISM Band Mixer.
LO-RF Isolation = 16 dB
LO-IF Isolation = 35 dB
RF-IF Isolation = 27 dB
LO Drive Level = -5 dBm
DC Power = 3.0V @ 9 mA
7-146
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
