W3020 Datasheet, PDF (29/44 Pages) Agere Systems – GSM Multiband RF Transceiver

Advance Data Sheet
December 1999
W3020 GSM Multiband RF Transceiver
Programming Information (continued)
CONFIG Register (continued)
Table 38. C3: Receive LO1 Buffer Mode During dc Calibration
C3
Bit 9
0
1
Function
RX LO1 Buffer Off During dc Offset Calibration
RX LO1 Buffer On During dc Offset Calibration
Table 39. C2: LNA Mode During dc Calibration
C2
Bit 8
Function
0 LNA Off During dc Offset Calibration*
1 LNA On During dc Offset Calibration
*Recommended to meet GSM sensitivity requirement.
Table 40. C1: 540 MHz LO2 Phase Detector Polarity
C1
Bit 7
0
1
Function
(See Figure 10.)
Negative Charge Pump Polarity (VCO2 Frequency Decrease with CP2 Voltage)
Positive Charge Pump Polarity (VCO2 Frequency Increase with CP2 Voltage)
LOOP FILTER
REFERENCE
W3020
PLL
VCO OUTPUT
FREQUENCY
C1 STATE = 1
C1 STATE = 0
540 MHz VCO
VCO INPUT CONTROL
VOLTAGE
Figure 10. Programming the LO2 Phase Detector Slope
Lucent Technologies Inc.
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