HD155121F Datasheet, PDF (49/57 Pages) Hitachi Semiconductor – RF Transceiver IC for GSM and PCN Dual band cellular systems

HD155121F
IQ Modulator and OffsetPLL Typical Performance (cont)
Tx spectrum vs. Common mode voltage
GSM mode (902MHz)
0
Carrier suppression ratio
−10
Side-band suppression ratio
−20
−30
−40
−50
−60
−70
−80
−90
Operating range
−100
0.25 0.50 0.75 1.00 1.25 1.50 1.75
Common mode voltage (V)
Tx spectrum vs. Common mode voltage
PCN mode (1747MHz)
0
Carrier suppression ratio
−10
Side-band suppression ratio
−20
−30
−40
−50
−60
−70
−80
−90
Operating range
−100
0.25 0.50 0.75 1.00 1.25 1.50 1.75
Common mode voltage (V)
Tx spectrum vs. Input swing level
GSM mode (902MHz)
0
Carrier suppression ratio
−10
Side-band suppression ratio
−20
−30
−40
−50
−60
−70
−80
−90
Operating range
−100
0.40 0.60 0.80 1.00 1.20 1.40 1.60
Input swing level (Vpp) (single)
Tx spectrum vs. Input swing level
PCN mode (1747MHz)
0
Carrier suppression ratio
−10
Side-band suppression ratio
−20
−30
−40
−50
−60
−70
−80
−90
Operating range
−100
0.40 0.60 0.80 1.00 1.20 1.40 1.60
Input swing level (Vpp) (single)
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