MC13158 Datasheet, PDF (20/24 Pages) Motorola, Inc – WIDEBAND FM IF SUBSYSTEM FOR DECT AND DIGITAL APPLICATIONS

MC13158
Figure 25. S+N+D, N+D, N
versus Input Signal Level (without preamp)
10
S+N+D
0
–10
VS = 3.0 Vdc
fdev = ±125 kHz
– 20
fmod = 1.0 kHz
fRF = 112 MHz
– 30
N+D
IF 3.0 dB BW = 280 kHz
– 40
– 50
– 60
N
–70
–120 –100
– 80
– 60
– 40
– 20
0
RF INPUT SIGNAL (dBm)
10
0
–10
– 20
– 30
– 40
– 50
– 60
–70
–120
Figure 26. S+N+D, N+D, N versus
Input Signal Level (with preamp)
S+N+D
VS = 3.0 Vdc
fdev = ±125 kHz
fmod = 1.0 kHz
fRF = 112 MHz
N +D
IF 3.0 dB BW = 280 kHz
N
–100
– 80
– 60
– 40
– 20
0
RF INPUT SIGNAL (dBm)
Figure 27. Input IP3, 1.0 dB Compression Pt. Test Setup
112 MHz
MIXER
FET Probe
TEK P6201
Mini–Circuits ZSFC–4
4 Way Zero Degree
Combiner
50
50
112.1 MHz
100 p
0.8–10 p
270
47
100 p
G3 = 18 dB
NF3 = 14 dB
To
Spectrum
Analyzer
Local
Oscillator
HP8657B
fLO _{– 122.7 MHz @ –6.0 dBm}
Figure 28. –1.0 dB Compression Pt. and Input
Third Order Intercept
–10
1.0 dB Comp. Pt. = – 39 dBm
– 20
IP3 = – 32 dBm
– 30
– 40
– 50
– 60
–70
– 80
– 60
VS = 3.5 Vdc
fRF1 = 112 kHz
fRF2 = 112.1 kHz
fLO = 122.7 MHz
PLO = – 6.0 dBm
See Figure 27
– 50
– 40
– 30
– 20
RF INPUT SIGNAL LEVEL (dBm)
20
MOTOROLA ANALOG IC DEVICE DATA