Aydin Babakhani

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—In this paper, we present the receiver and the on-chip antenna sections of a fully integrated 77-GHz four-element phased-array transceiver with on-chip antennas in silicon. The receiver section of the chip includes the complete down-conversion path comprising low-noise amplifier (LNA), frequency synthesizer, phase rotators, combining amplifiers, and(More)
—A near-field direct antenna modulation (NFDAM) technique is introduced, where the radiated far-field signal is modulated by time-varying changes in the antenna near-field electromagnetic (EM) boundary conditions. This enables the transmitter to send data in a direction-dependent fashion producing a secure communication link. Near-field direct antenna(More)
In typical radio transmitters, the signal is modulated at lower frequencies and then up-converted, amplified, and radiated by an antenna. In the absence of multi-path, receivers at different angles observe the same modulated signal, only different in gain factor and time delay. Although a directional antenna radiates more power in some angles than others,(More)
Graphene and hexagonal boron nitride (h-BN) have similar crystal structures with a lattice constant difference of only 2%. However, graphene is a zero-bandgap semiconductor with remarkably high carrier mobility at room temperature, whereas an atomically thin layer of h-BN is a dielectric with a wide bandgap of ∼5.9 eV. Accordingly, if precise(More)
—This paper describes a new approach to low-phase-noise LC VCO design based on transconductance linearization of the active devices. A prototype 25 GHz VCO based on this lin-earization approach is integrated in a dual-path PLL and achieves superior performance compared to the state of the art. The design is implemented in 32 nm SOI CMOS technology and(More)
In this paper, a direct digital-to-impulse transmitter is implemented that radiates impulses with EIRP of 13dBm and a record pulse-width of shorter than 8psec. It is shown that the starting time of the radiated impulses can be locked to the edge of the input trigger with a high timing accuracy. It is demonstrated that two widely spaced chips can generate(More)
—This paper reports a 6-to-18 GHz integrated phased-array receiver implemented in 130-nm CMOS. The receiver is easily scalable to build a very large-scale phased-array system. It concurrently forms four independent beams at two different frequencies from 6 to 18 GHz. The nominal conversion gain of the receiver ranges from 16 to 24 dB over the entire band(More)
  • Sanggeun Jeon, Yu-Jiu Wang, Hua Wang, Florian Bohn, Arun Natarajan, Aydin Babakhani +1 other
  • 2008
Very-large-scale phased arrays (~10 6 elements) can provide tremendous array gain, noise improvement, and beamforming capabilities for a variety of applications such as radar and communications. Such phased-array systems have traditionally been implemented using compound semiconductors in a module-based approach. However, the dominant cost of these systems(More)