BB5 Engine Structure

[rakesh_behrani]

Key Components 0f WCDMA Receiver
Why do we need Additional Filtering?
This SAW filter is to attenuate the Tx signal which is leaking through the duplex filter and amplified by the LNA
Why do we use duplexer instead of antenna switch?
This is because Tx and Rx are functioning in continuous mode in WCDMA
What is the use of AGC stage?
This stage is used to maintain the voltage swing at the AD converter in BB at an adequate level

Power Control Loop – GSM Transmitter

Power Detector Circuitry in PA gives a DC value proportional to the output power
DC level is feedback to the negative input of ERROR amplifier in VINKU
The DC level is then compare with the TXC reference signal
The output of the ERROR amplifier is then fed to a buffer amplifier which drive the VGA

Note: TXC is obtained from the
network for power level control

[rakesh_behrani]

Power Control Loop – GSM Transmitter

[rakesh_behrani]

RETU’s OUTPUT VOLTAGES

[rakesh_behrani]

Interfaces to BB


Supply voltages
VBATT from battery
VXO, VCP1, VCP2, VREF from RETU
Control signals
AFC, TXC from RETU
RFBUS from RAP3G
Data signals
RXI/Q to RAP3G
TXI/Q from RAP3G
Outgoing signals
Clock (balanced) to RAP3G
Clock (single ended) to Bluetooth™
VREF for RXI/Q ADCs
IREF for TXI/Q DACs
RFTEMP, WTXDET to RETU

WCDMA Power Amplifier

[rakesh_behrani]

X-BUS or SSI

SSI = Speed Serial Interface
CMT-APE: A communication interface between RAP3G and OMAP1710 using Speed Serial Interface (SSI)
Data is transmitted via two lines: Data and Flag
Ready: indicates to opposite side that new frame can be sent
Wake: activated when data is wanted to transmit to opposite side

[rakesh_behrani]

Nokia PCB IC list / compatibility for BB5 phones
model: RAP: OMAP: TAHVO/BETTY: RETU/VILMA: AHNE/PIHI/HINKU/VINKU

[rakesh_behrani]

Thanks All

And Wait Me For New Posts

[celldoct]

hi rakesh bhai
I really appriciate the work done on bb5 and this is the most useful thing for all members to technically know about bb5 ....
I thank the admin for having such a higly qualified memebers in our forum
I await for more such infos from RB
my hearty wishes to him and all the members of the forum