CDMA/AMPS Dual Band RF Receiver
VENUS-L
CDMA/AMPS Dual Band RF Receiver Preliminary Information
DS5082 Issue 2.1 J June 1999
Features
q Selectable dual...
Description
VENUS-L
CDMA/AMPS Dual Band RF Receiver Preliminary Information
DS5082 Issue 2.1 J June 1999
Features
q Selectable dual RF input ports for 900MHz AMPS and 1900MHz CDMA bands. q Power Management Control
Ordering Iinformation
VENUS-L/KG/QP1S VENUS-L/KG/QP1T
Description
VENUS-L is a dual integrated mixer circuit designed to meet the IS95 and J-STD-008 receive system specifications operating in the 900 MHz and 1900MHz bands. Venus-L is part of a complete chipset solution for CDMA phones called the Planet chipset, and is built on a Mitel advanced bipolar process with FT's of 25GHz.
GND
VCC
CDMA IF RF 1900 CDMA IFB
AMPS IF RF 900 AMPS IFB
CHIP ENABLE CONTROL BAND 1900
LO 2GHZ
Figure 2. Block diagram
LO 1GHZ
VENUS-L
Preliminary Information
CDMA IF CDMA IFB VCC
1
16
BAND 1900 GND RF 1900
PIN 1 REF. SPOT
LO 2GHZ GND RF 900 GND CHIP ENABLE
GND LO 1GHZ VCC AMPS IFB
8
9
AMPS IF
QSOP16 Figure1 Pin Connections
Circuit Description
The RF section of VENUS-L contains all of the circuitry necessary to downconvert the RF signal from 900 MHz or 1900 MHz to an IF of 50-250 MHz, and to correctly interface with a suitable IF SAW filter. Two RF inputs are provided, one for the 1900MHz band and one for the 900 MHz band. The required input is activated by means of the ‘BAND 1900’ pin. The input is a gm stage which will provide a characteristic impedance to correctly terminate the RF image-reject SAW filter. Two LO ports are provided, one for 1900MHz band and one for 900 MHz ba...
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