Ofer Friedman

All-digital TX frequency synthesizer and discrete-time receiver for Bluetooth radio in 130-nm CMOS

We present a single-chip fully compliant Bluetooth radio fabricated in a digital 130-nm CMOS process. The transceiver is architectured from the ground up to be compatible with digital deep-submicron CMOS processes and be readily integrated with a digital baseband and application processor. 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 architecture takes advantage of the wideband frequency modulation capability of the all-digital phase-locked loop with built-in automatic compensation to ensure modulation accuracy. 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 complete chip also integrates power management functions and a digital baseband processor. Application of the presented ideas has resulted in significant area and power savings while producing structures that are amenable to migration to more advanced deep-submicron processes, as they become available. The entire IC occupies 10 mm/sup 2/ and consumes 28 mA during transmit and 41 mA during receive at 1.5-V supply.

A discrete-time Bluetooth receiver in a 0.13/spl mu/m digital CMOS process

A discrete-time receiver architecture for a wireless application is presented. Analog signal processing concepts are used to directly sample the RF input at Nyquist rate. Maximum receiver sensitivity is -83dBm and the chip consumes a total of 41mA from a 1.575V internally regulated supply. The receiver is implemented in a 0.13/spl mu/m digital CMOS process.

A Built-in Tester for Modulation Noise in a Wireless Transmitter

A fully digital implementation for an RF built-in self-test (RF BIST), incorporated within a digital RF processor (DRPtrade)-based system-on-chip (SoC), is presented. The proposed mechanism serves as an on-chip built-in modulation-noise estimation-module (BIMNEM) for the testing of the 2.4 GHz local oscillator of a Bluetooth transceiver offered by Texas Instruments. This SoC, realized in a standard 130 nm digital CMOS process, is being tested in mass production using a digital very-low-cost-tester (VLCT) that leverages on the internal test capabilities of the SoC, thereby minimizing test costs. Experimental results are shown and the extension of this approach for implementation in the later generations of DRP based SoCs is briefly discussed

Coexistence Performance Enhancement Techniques for DRP Based WLAN/WPAN and Cellular Radios Collocated in a Mobile Device

The incorporation of Bluetooth and Wireless LAN transceivers in a mobile devices poses design challenges associated with their coexistence with the cellular transceiver, as they often need to operate concurrently and their close proximity is inevitable. We present some recently developed techniques that transform the RF and analog circuit design complexities, typically encountered when targeting enhanced coexistence performances, into the digital domain, and demonstrate how these techniques allow the concurrent operation of two transceivers without each of them adversely impacting the performance of the other. The ideas presented have been implemented in a commercial Bluetooth single chip transceiver offered by Texas Instruments.

Enhancement of Coexistence Performance in a DRP Based Multi-Radio Environment of a Mobile Phone

The incorporation of Bluetooth and Wireless LAN transceivers in a mobile device poses design challenges associated with their coexistence with the cellular transceiver, as they often need to operate concurrently and their close proximity is inevitable. We present recently developed techniques that transform the RF and analog circuit design complexities, typically encountered when targeting coexistence performance improvements, into the digital domain, and demonstrate how these techniques allow the concurrent operation of multiple transceivers without one adversely impacting the performance of the other. The ideas presented have been implemented in Bluetooth/WLAN transceivers offered by Texas Instruments.