THIS GRANT IS A CONTINUATION OF N000141410257 - Passive Wideband Interferometer enabled by non-Foster Quasi-Constant Phase Shifter for Error Feedback Transmitter
Abstract
Professor Qun Jane Gu at the University of California, Davis is submitting this proposal titled ÒPassive Wideband Interferometer enabled by non-Foster Quasi-Constant Phase Shifter for Error Feedback TransmitterÓ to ONR in response to BAA 13-023, Office of Naval Research (ONR) Young Investigator Program (YIP). We propose a 3-year program with the total requested funding of $510,000. Research Problem: This proposal seeks to develop Passive Wideband Interferometer (PWI) based error feedback transmitter (EFBTx) to generate high spectral purity output to enable Simultaneous Transmitting and Receiving (STAR) operations. Existing transmitter linearization techniques with OIMD > -50 dBc and high noises cannot satisfy STAR needs. This is mainly due to the dynamic range constraints from distortion detection circuitries, which have to process not only small distortions and noises but also large signals. The required signal dynamic range (i.e. > 80 dB) is too large to be supported by existing technologies. To remove this constraint, the PI proposes PWI based EFBTx to suppress the large signal before feeding into the error extraction circuitries, therefore alleviating the corresponding dynamic range requirement and simultaneously suppressing noises. To support ultra-wide instantaneous band, i.e. > 2 GHz, non- Foster quasi-constant phase shifter is further proposed to enable a wideband PWI. The non- Foster technique leverages negative inductors or capacitors to overcome the narrow bandwidth in conventional Foster components and break the ÒDarlingtonÓ limit of the achievable bandwidth by using a limited number of components. Analytical and preliminary results indicate that the PWI based EFBTx enabled by non-Foster quasi-constant phase shifter holds great potentials for transmitters to provide ultra clean outputs. Technical Approach: The proposed PWI enabled EFBTx based on non-Foster quasi-constant phase shifters has four key innovations: (1) EFBTx not only boosts the transmitter linearity, but also suppresses the noises to generate ultra clean output signals; (2) PWI, based on quasi-passive implementation, supports ultra-high linearity and low noise performances; (3) non-Foster quasiconstant phase shifters defy the conventionally monotonic increase of reactance with frequencies to achieve ultra-wide instantaneous bandwidth; (4) state-space stability analysis method and low noise and high linearity design methodologies are crucial to push performance limits while maintaining stability. Outcome: We will conduct both theoretical and experimental research to demonstrate the proposed innovative architecture and the enabling component. This includes (1) the theories of PWI enabled EFBTx and the fundamental linearity and noise constraints with practical circuit parameters. (2) the fundamental bandwidth limits to provide a constant phase shift by using non- Foster elements. (3) the state-space stability analysis method and low noise and high linearity design methodologies for non-Foster circuits; (3) a PWI with > 30 dB signal suppression and > 2 GHz instantaneous bandwidth; (4) a proof-of-concept prototype of EFBTx based on heterogeneous integration to demonstrate < -80 dBc OIMD, < 5 dB NF and 2-18 GHz tunable bandwidth. Impact on DoN Capabilities: The success of this project will advance transmitter design techniques for C4ISR systems and other Navy and Marine Corps electronic systems. It will lead to single aperture STAR capabilities with optimum performances. It will also facilitate decentralized operations by enabling high performance and small size
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 10, 2016
- Source ID
- N000141612287
Entities
People
- Qun Jane Gu
Organizations
- Office of Naval Research
- United States Navy
- University of California, Davis