A Level shifter used in multiple voltage digital circuits is presented. Level shifter allow for effective interfacing between voltage domains supplied by different voltage level .Usually conventional level shifter which can shift any voltage level signal to a desired higher level with low leakage current .In this level shifter we used multi VDD design techniques which give more design flexibili...

We report a novel approach to generating full-duty-cycle triangular waveforms based on a microwave photonic filter (MPF) with negative coefficient. It is known that the Fourier series expansion of a triangular waveform has only odd-order harmonics. In this work, the undesired even-order harmonics are suppressed by the MPF that has a periodic transmission response. A triangular waveform at funda...

Phase shift exceeding tau/2 at 1 THz is demonstrated by using electrically controlled birefringence in a homeotropically aligned nematic liquid crystal (E7) cell, 570 microm in thickness. The driving voltage required for a phase shift of 90 degrees is 125 V (rms). We demonstrate that the phase shifter works as an electrically switchable quarter-wave plate at 1 THz. The device can also be used a...

by Pinping Sun, Ph.D. Washington State University August 2008 Chair: High speed SiGe MMICS for phased array communications has been widely used in satellite communications. This dissertation presents the development of reconfigurable SiGe MMICs for upper X-band or lower Ku band satellite phased array communications. Novel high-isolation, low-insertion-loss and highly linear octagonal PIN diode ...

Magnetically controlled waveguide-based phase shifters are desirable for their high performance, but bulky and heavy, thus cannot be easily integrated with printed circuit board (PCB) based circuits. To tackle this, substrate-integrated waveguide (SIW) technology has been utilized, which brings the to a standard PCB, requires large numbers of vias as well multiple cavities in substrate ferrite ...

We demonstrate the first sub-100 μm silicon Mach-Zehnder modulators (MZMs) that operate at >10 Gb/s, by exploiting low-dispersion slow-light in lattice-shifted photonic crystal waveguides (LSPCWs). We use two LSPCW-MZM structures, one with LSPCWs in both arms of the MZM, and the other with an LSPCW in only one of the arms. Using the first structure we demonstrate 10 Gb/s operation with a operat...

In iterative learning control (ILC), it is highly desirable to have a learning compensator with a unitgain for all frequencies, in order to avoid noise amplification and learning speed degradation during the learning process. In this paper, we show that the realization of a unit-gain compensator is straightforward in ILC, using both forward and backward filtering. As an illustrative example, a ...

Magic tee is a widely used component in microwave systems; the four arms of a conventional magic tee direct at four different directions, which occupy much space and give inconveniences to the assemblage of a system. In this paper, a waveguide narrow-wall slot directional coupler and an E-plane dielectric loaded waveguide phase shifter are used to make up of a magic tee with four arms in the sa...