Bandpass, Delta-Sigma, Analog-to-Digital Converter (BP Delta-Sigma ADC) for advanced Digital Array Radar (DAR) (9611)

Q-DOT proposes to develop a BP delta-sigma ADC in 120 GHz SiGe for use in advanced DAR. IBM's 7HP SiGe BiCMOS process enables the integration of a complete ADC modulator plus support circuitry (e.g., laser diode driver) on a single small, inexpensivesilicon chip. It's small size, low power dissipation, and low cost permit this high-performance ADC to be included in the T/R module for each array element! Its single-bit digital output supports data transmission via COTS optical fiber components.Together with a single-bit delta-sigma DAC (under development separately by Q-DOT), the entire signal interface to the T/R module comprises two, single-bit streams of digital data. The ADC (and DAC) combined with wide bandwidth, one-bit delta-sigma,true-time-delay, digital beamforming will yield an innovative, high-performance, low-cost, multi-function DAR. The BP delta-sigma ADC will be conceptually designed in Phase I to assess its performance. It will be designed and fabricated in Phase II andintegrated into a demonstration system in Phase III. The BP delta-sigma ADC technology will enhance the capability of radar for commercial aviation on aircraft and on the ground. It will enable Direct Broadcast Satellite (DBS) reception on moving vehicles(e.g., automobiles). Single ADCs will enable highly versatile, software-configured receivers for communications hand-sets and base stations.