Showing papers on "Bessel filter published in 1991"

Design of a 15-MHz CMOS continuous-time filter with on-chip tuning

Abstract: A fifth-order CMOS continuous-time Bessel filter with a tunable 6- to 15-MHz cutoff frequency is described. This fully balanced transconductance-capacitor (G/sub m/-C) leapfrog filter achieves a dynamic range of 55 dB while dissipating 96 mW in a 5-V 0.9- mu m CMOS process. The author reviews the disk drive application and filtering requirements, and explains why the G/sub m/-C continuous-time filtering approach was used. The on-chip master-slave tuning system uses a voltage-controlled oscillator (VCO). Experimental results are presented. >

Digitally programmable linear phase filter having phase equalization

Abstract: A digitally programmable Bessel filter includes a plurality of serially connected stages or biquads with each biquad including a plurality of programmable operational transconductance amplifiers. The first stage of the filter provides an all pass equal amplitude response. Two stages provide pulse slimming (first and second derivatives of an input pulse), and three stages provides a sixth order Bessel low pass function. The operational transconductance amplifiers are controlled by a fine tuning control signal, and an array of integrating capacitors are selectively controlled by a coarse tuning signal. The fine tuning and coarse tuning signals are generated in a phase locked loop from a reference clock and a reference biquad which receives the reference clock. The phase locked loop includes a phase detector responsive to the reference clock and the reference biquad, whose output is integrated.

Rapid evaluation of integer-order Bessel functions using an FFT algorithm

Abstract: A rapid, accurate, and stable method for computing integer-order Bessel functions is presented. In contrast to the iterative procedures normally used in the numerical evaluation of Bessel functions, this approach requires little more than a commonly available fast Fourier transform algorithm, and yet, for a given argument, can provide many J/sub n/s in a single pass. >

On the zeros of Bessel type functions and applications to exact controllability problems

Abstract: Komornik, V., On the zeros of Bessel type functions and applications to exact controllability problems, Asymptotic Analysis 5 (1991) 115-128. We derive several new monotonicity properties and asymptotical formulae for the positive zeros of various Bessel type functions. Using these results we characterize the exactly controllable states for some circular plate models. We show that they are independent of the control time.

Improved analysis of the nonlinear distortion performance of an N-level analog multiplier

Abstract: The author discusses the nonlinear distortion performance of an N-port analog multiplier under large signal conditions. Analytical expressions are obtained for the output up and down-converted frequencies in terms of the ordinary Bessel functions. >