PBL 3881
F5
F4
11
Receiver
input
F
2
Figure 10. Transmitter channel input
amplifier used to suppress ripple in the
mic. supply. (CMRR). R1 is used to
establish a balansed input.
R1 = R2 ≈ 3k2
R3 = R4 ≈ 100k
R5 = R6
C1 = C2
4
3
Ref.
R3
AGC
+
R4
R7
F1
+
-
13
12
C2
R1
R6
R5
1
2
R2
16
16
C1
Mic.
C4
C3
Figure 11. Receiver channel with
optional AGC arrangement.
VTxDet
mV
+600
+400
+200
VTx in
1.0
0.5
1.5
10.0
ref ≈1.9V
V
V
ref
mVp
5.0
VRx in
-200
-400
-600
VRxDet
Figure 12. Transmitter and receiver
channel rectifier characteristics.
Txin
Tx Det
N Det
Figure 13. Relationship in timing between
the voltage levels at TxIn, TxDet and NDet
mVp
+600
+400
+200
V+(V)
3.0
3.4
Figure 14. Transmitter and receiver
channel output dynamics.
7
ERICSSON [ ERICSSON ]
