Title :
Digital RF processing techniques for SoC radios (invited)
Author :
Staszewski, Robert Bogdan ; Muhammad, Khurram ; Leipold, Dirk
Author_Institution :
Wireless Analog Technol. Center, Texas Instruments Inc., Dallas, TX, USA
Abstract :
In this paper, we describe key digital RF processing techniques behind the first single-chip Bluetooth and GSM/EDGE radios realized in 130-nm and 90-nm digital CMOS process technologies, respectively. The local oscillator, transmitter and receiver are architectured from the ground up to be compatible with digital deep-submicron CMOS processes and be readily integrated with a digital baseband and application processors. The conventional RF frequency synthesizer architecture, based on the voltage-controlled oscillator and the phase/frequency detector and charge-pump combination, has been replaced with a digitally-controlled oscillator and a time-to-digital converter, respectively. The transmitter employs a polar architecture with all-digital phase/frequency and amplitude modulation paths. The phase/frequency modulation is based on the direct wideband frequency modulation capability of an all-digital phase-locked loop. The amplitude modulation path directly is built on a digitally-controlled power amplifier. The receiver employs a discrete-time architecture in which the RF signal is directly sampled and processed using analog and digital signal processing techniques. The discrete-time filtering at each signal processing stage is followed by successive decimation, such that great selectivity is achieved right at the mixer level.
Keywords :
Bluetooth; CMOS digital integrated circuits; amplitude modulation; cellular radio; digital signal processing chips; discrete time filters; frequency modulation; oscillators; phase locked loops; phase modulation; power amplifiers; radio receivers; radio transmitters; 130 nm; 90 nm; GSM/EDGE radios; RF frequency synthesizer architecture; SoC radios; all-digital frequency modulation paths; all-digital phase modulation paths; all-digital phase-locked loop; amplitude modulation paths; analog signal processing; application processors; charge-pump combination; digital CMOS process technologies; digital RF processing techniques; digital baseband processors; digital signal processing; digitally-controlled oscillator; digitally-controlled power amplifier; discrete-time filtering; frequency detector; phase detector; polar architecture; single-chip Bluetooth radios; time-to-digital converter; voltage-controlled oscillator; Amplitude modulation; Bluetooth; CMOS process; CMOS technology; Frequency modulation; Frequency synthesizers; GSM; Radio frequency; Radio transmitters; Voltage-controlled oscillators;
Conference_Titel :
System-on-Chip for Real-Time Applications, 2005. Proceedings. Fifth International Workshop on
Print_ISBN :
0-7695-2403-6
DOI :
10.1109/IWSOC.2005.54