IIn this paper, a tunable single-amplifier biquadratic lowpass filter is presented. It consists of one balanced low-gain current amplifier and a second-order MOSFET-C feedback network. The filter was integrated in a double-poly 0.6 pm CMOS process and operates from a 3.3 V power supply. The pole frequency is tunable from 15.2 to 17.2 MHz, the pole Q is 3, the spurious-free dynamic range is at l...

  In this paper, a microstrip lowpass filter with an ultra-wide stopband with sharp roll-off and compact size is designed and fabricated. To provide a very small dimension, T-shaped and stepped impedance have been used. The cut of frequency at -3 dB is 3.1 GHz. In the proposed structure, insertion loss is less than 0.12 and return loss is more than 15 dB. To achieve a -20dB attenuation level...

In this paper single filter frequency masking FIR filters are discussed. We briefly review the previously proposed lowpass narrowband filters and propose a design method for highpass narrow-band filters. Wide-band filters are also discussed. The proposed approach uses several identical filters, except for periodicity, which are mapped to a single hardware structure using folding. This results i...

This paper addresses a new approach for the design of multiband filters with step like magnitude responses and extremely flat, weighted passbands down to μdBs. Our new technique can also be used for the multiband step-wise approximation of arbitrary filter magnitude responses with precise transition band control. One marked advantage of the technique is that our basic building blocks are the mo...

In this paper, an inverse S-shaped slotted ground structure (S-SGS) is proposed and analyzed. The S-SGS generates dual attenuation poles that can be easily controlled by its structure parameters. The equivalent circuit of the S-SGS consists of lumped elements that can be extracted from the measured S parameters. Moreover, several S-SGS cells are applied to form a miniaturized lowpass filter (LP...

In this paper, very high frequency (VHF) current and voltage biquadratic lowpass filters implemented directly by the linear wideband finite-gain current and voltage amplifiers, respectively, are proposed and analyzed. A new Q-enhancement circuit which consists of a finite-gain wideband tunable voltage amplifier and a Miller capacitor is also proposed. It can increase the maximum-gain frequency ...

CONSIDINE, v.: 'Digital complex sampling', Electron. Lett., 1983, 19, pp. 608-609 RICE, U. w., and wu, K. H.: 'Quadrature sampling with high dynamic range', IEEE Trans., 1982, AES-18, (4), pp. 736739 RAOER, c. M.: 'A simple method for sampling in-phase and quadrature components', IEEE Trans., 1984, AESZO, (6), pp. 821-824 RAFFEXTY, w., and SAULMER, G. I.: 'Variable-delay, sinelcosine noncoheren...

In remote sensing, the number of training samples is often limited. For hyperspectral data, it becomes more difficult to obtain accurate estimates of class statistics because of the small ratio of the training sample size to dimensionality. Generally speaking, classification performance depends on four factors: class separability, the training sample size, dimensionality, and classifier type (o...

In this paper we investigate the performance of multiplier free FIR filter design using an extremely non-linear Σ-∆ architecture. This architecture which is known as the Look Ahead Decision Feedback (LADF) circuit [1], has not been used in FIR filter design earlier. The circuit is highly non-linear because of the thresholding operation in the architecture. In this paper, we compare the LADF arc...