In order to test a model of peripheral vision, various contrast sensitivity functions (CSF's) and fundamental eccentricity constants (FEC's) [see J. Opt. Soc. Am. A 8, 1762 (1991)] were applied to real-world, wide-field (6.4 degrees-32 degrees eccentricity) images. The FEC is used to model the change in contrast sensitivity as a function of retinal eccentricity. The processed test images were t...

Designing of dual-band bandpass filters has become wide spreading to support wireless communication system standards including WLANs [1-6]. Although they have presented new structures for reducing size by using a quarter wavelength structure in [1-3], meandered resonator to increase coupling value for high selectivity [4-5], and interdigital capacitors between resonators for high selectivity, t...

frequency 40MHz with 78dB Dynamic Range in a 0.35µm CMOS process. I. INTRODUCTION Oversampling bandpass A/D is widely used because of its increased accuracy and decreased analog front-end circuitries in transceiver systems. High frequency digital processing is more robust than its analog counterpart, and does not have the analog circuit imperfections. Digital IF extraction is also very benefici...

An optoelectronic oscillator (OEO) with wideband frequency tunability and stable output based on a bandpass microwave photonic filter (MPF) has been proposed and experimentally demonstrated. Realized by cascading a finite impulse response (FIR) filter and an infinite impulse response (IIR) filter together, the tunable bandpass MPF successfully replaces the narrowband electrical bandpass filter ...

We discuss a near-infrared (NIR) narrow-band tunable birefringent filter system newly developed by the Big Bear Solar Observatory (BBSO). This is one of the first narrow-bandpass NIR filter systems working at 1.56 μm which is used for the observation of the deepest solar photosphere. Four stages of calcite were used to obtain a bandpass of 2.5 Å along with a free spectral range (FSR) of 40 Å. S...

This paper proposes parallel-coupled stepped impedance resonators (SIRs) used for wideband bandpass filters with reduced size and improved spurious response suppression in out-of-band. The filter design concept is demonstrated by both twoand four-parallel coupled line resonator structures with the same fundamental frequency (f0) of 6.5GHz. The first bandpass filter has been designed using two r...

A more general development of a building block for intrinsic evolution of analogue hardware is introduced and explained. A wide variety of linear and non-linear instantaneous and time-related characteristics can be created with the block, and blocks may be interconnected in a very general way. Examples of different types of achievable characteristic are shown and results of a comparison of diff...

By using a composite coupling structure for coplanar waveguide (CPW)/microstrip, a new dual-band bandpass filter (DBBPF) stacking inverted Y-shaped CPW resonators and rectangular ring resonators is proposed. Two resonant frequency bands are simultaneously excited by the CPW feed line. However, it can be convenient to tune individually. Several transmission zeros are realized to improve the sele...

A more general development of a building block for intrinsic evolution of analogue hardware is introduced and explained. A wide variety of linear and non-linear instantaneous and time-related characteristics can be created with the block, and blocks may be interconnected in a very general way. Examples of different types of achievable characteristic are shown and results of a comparison of diff...