Jonathan Min

A low-power baseband receiver IC for frequency-hopped spread spectrum communications

A baseband receiver IC which will be incorporated into a low-power frequency-hopped spread spectrum (FH/SS) transceiver for 902-928 MHz ISM band applications is presented. The chip performs noncoherent binary/quaternary frequency shift keying (FSK) demodulation, equal-gain diversity combining of dual antenna branches, and symbol and frequency synchronization. The chip also accommodates variable data rates from 2 to 160 kb/s, programmable hop rates, and tunable bandwidth Loop filters. The core area of the 1-/spl mu/m CMOS chip is 3.9 mm/spl times/3.9 mm with a power consumption of 4.5 mW at 10 MHz from a 3-V supply. A baseband transceiver system utilizing this receiver chip for the prototype handset to demonstrate a point-to-point communication link is also described. Two XILINX FPGA chips were used to implement the remainder of the baseband transceiver functions, including frequency control logic for FSK modulation, acquisition control, data framing, symbol interleaving and deinterleaving, and interface control for data and voice.

An all-CMOS architecture for a low-power frequency-hopped 900 MHz spread spectrum transceiver

An all-CMOS single chip architecture of a frequency-hopped spread spectrum (FH/SS) transceiver is presented. The transceiver implements complete modem functions spanning a tuned RF front-end to a digital binary frequency-shift keying (FSK) modulator/demodulator, all operating from a 3-V supply. This FH/SS transceiver is intended for use in a wide variety of indoor/outdoor portable wireless applications in the 902-928 MHz ISM band [1]. System features such as dual antenna/branch diversity, fast frequency hopping, and adaptive power control are incorporated into the transceiver architecture to achieve robust wireless digital data transmission over multipath fading channels. This paper describes the architectural features of the transceiver and surveys several of the key building blocks which have been completed to date.<<ETX>>

A low-power baseband receiver IC for frequency-hopped spread spectrum applications

A baseband receiver IC which will be incorporated into a monolithic CMOS 900 MHz frequency-hopped spread spectrum (FH/SS) transceiver is described. The chip performs noncoherent binary/quaternary frequency shift keying (FSK) demodulation, equal-gain diversity combining of dual antenna branches, and symbol and frequency synchronization. The chip also accommodates variable data rates from 2-160 kbps, programmable hop rates, and tunable bandwidth of loop filters. The die area of this 1-/spl mu/m CMOS chip is 5.4 mm /spl times/5.4 mm with a power consumption of less than 6 mW from a 3-V supply.