Nokia 9110 Service Manual
PAMS
Technical Documentation
RAE–2
BS8_RF
Page 3 – 10
Original 02/99
Functional descriptions
RF block diagram
The RF block comprises a conventional dual conversion receiver and the
transmitter features an up–conversion mixer for the final TX–frequency.
transmitter features an up–conversion mixer for the final TX–frequency.
The architecture contains three ICs. Most of the functions are horizontally
and vertically integrated. UHF functions except power amplifier and VCO
are integrated into CRFU_1a, which is a BiCMOS–circuit suitable for
LNA– and mixer–function. Most of the functions are in SUMMA, which
also is a BiCMOS–circuit. SUMMA is a IF–circuit including IQ–modulator
and PLLs for VHF– and UHF–synthesizers.
and vertically integrated. UHF functions except power amplifier and VCO
are integrated into CRFU_1a, which is a BiCMOS–circuit suitable for
LNA– and mixer–function. Most of the functions are in SUMMA, which
also is a BiCMOS–circuit. SUMMA is a IF–circuit including IQ–modulator
and PLLs for VHF– and UHF–synthesizers.
Power amplifier is also an ASIC, it is a so called MMIC ( monolithic mi-
crowave integrated circuit ). It has got three amplifier stages including in-
put and interstage matchings. Output matching network is external. Also
TX gain control is integrated into this chip.
crowave integrated circuit ). It has got three amplifier stages including in-
put and interstage matchings. Output matching network is external. Also
TX gain control is integrated into this chip.
See block diagram next page