Rfmd Fem Logic; Analog Power Control Signals (Txc, Vpc, Vdet) - Nokia RH-53 Troubleshooting Instructions

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RFMD FEM logic

Mode
Idle
Low Band RX
Low Band TX
High Band RX
High Band TX

Analog Power control signals (TXC, VPC, VDET)

The pictures in the following page show the typical shapes of the control signals low band, right
side it for highest power – left side for lowest power. In all the pictures TXP is used a the trigger
point and is seen in the top of each picture. The difference between the high band and the low
band is that he high band signals looks the same with only small changes in level. The activat-
ing of high band Vdet starts 5us earlier than for low band.
58
Table 14: RFMD FEM logic
Vtx
VTX_B_P VTX_B_P
0 0
0 0
1 0
0 1
1 1
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
BS VC1
Vant1
0
1
1
1
1
RH-53/54
VC2
Vant2
0
0
0
0
0
ISSUE 1 09/2004