HD155121F Datasheet, PDF (56/57 Pages) Hitachi Semiconductor – RF Transceiver IC for GSM and PCN Dual band cellular systems

HD155121F
designed for 1.2MHz bandwidth loop filter
100
50
GSM
PCN
0
designed for 1.2MHz bandwidth loop filter
−80
−130
GSM, PCN
−180
−50
−230
−100
10⁴
10⁵
10⁶
10⁷
10⁸
Frequency (Hz)
−280
10⁴
10⁵
10⁶
10⁷
10⁸
Frequency (Hz)
Figure A-3 The Magnitude, | Hol(jω) |, and the Phase, Φ(jω),
of Open Loop Transfer Function Hol(jω)
Moreover, the closed loop transfer function, Hcl(jw) is the following equation, and the magnitude
characteristic, Hcl(jω), of he closed loop is shown is figure A-4.
Hcl(jω) = ^Hol(jω)
1+ Hol(jω)
designed for 1.2MHz bandwidth loop filter
20
GSM
0
−20
PCN
−40
−60
−80
−100
10⁴
10⁵
10⁶
10⁷
10⁸
Frequency (Hz)
Figure A-4 The Magnitude, | Hcl(jω) | of Closed Loop Transfer Function Hcl(jω)
56