MB54609 Datasheet, PDF (17/23 Pages) Fujitsu Component Limited. – Quadrature Modulator IC (With 1.0 GHz Up-converter)

MB54609
(Continued)
• RF output level dependent on baseband amplitude
(PRF: test circuit 1, Modulation precision: test circuit 2)
@ Baseband signal of test circuit 2: π/4 DQPSK, 42 kbps, 1.0 Vpp, PN 15, Root-Nyquist filter α = 0.5
Input signals of test circuits 1 and 2: LO1 = 356 MHz, –5 dBm; LO2 = 1619 MHz, –5 dBm
Output signals of test circuits 1 and 2: RFout = 1441 MHz
0
–10
–20
PRF
6
–30
4
VERR
–40
2
0
0.1
1
10
Base band amplitude VBB (Vpp)
• RF output level dependent on LO1 and LO2 input levels
(PRF: test circuit 1, Modulation precision: test circuit 2)
@ Baseband signal of test circuit 2: π/4 DQPSK, 42 kbps, 1.0 Vpp, PN 15, Root-Nyquist filter α = 0.5
Input signals of test circuits 1 and 2: LO1 = 356 MHz, –5 dBm; LO2 = 1619 MHz, –5 dBm
Output signals of test circuits 1 and 2: RFout = 1441 MHz
• RF output level dependent on LO1 input level • RF output level dependent on LO2 input level
(@PLO2 = –5 dBm)
(@PLO1 = –5 dBm)
0
–10
–20
–30
–40
–20
P RF
6
4
V ERR ²
0
–15
–10
–5
0
5
Shifter output level P LO1 (dBm)
0
–10
–20
–30
–40
–20
P RF
6
4
V ERR
2
0
–15
–10
–5
0
5
Mixer input level P LO2 (dBm)
(Continued)
17