Sgs-thomson Microelectronics S.r.l.

Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno

Marco DeMicheli

Melchiorre Bruccoleri

Giuseppe Patti

Davide Demicheli

Valerio Pisati

Gaetano Cosentino

A servo-demodulator for a pair of alternating signals generated by a magnetic disc read head and indicative of the position of the read head in relation to the center of a recorded track. The servo-demodulator comprises a peak detector for successively and individually sampling the amplitude of each of a plurality of peaks of the pair of alternating signals, and a capacitor periodically connected to the output of the peak detector by a control logic for deriving a weighted average of the various successively sampled amplitudes. In this manner, the control logic obtains an averaged measure of amplitude with high immunity to noise.

Circuit and method for determining the position of a read head for a magnetic disk drive device

Magnetic disc read head positioning device and method

A current-controlled multivibrator having increased accuracy independent of variations in process and temperature. The oscillator employs a bandgap voltage in combination with a current generator to ensure operational stability despite temperature and process variations.

Temperature independent current controlled multivibrator

An anti-logarithmic type converter circuit, with temperature compensation, includes a diode connected between a unity gain, non-inverting interface circuit and a low-impedance reference voltage circuit. A thermal compensation circuit is connected between the converter input and the interface circuit. The thermal compensation circuit includes current mirror circuits having a gain higher than one and their output currents linearly dependent on temperature.

Anti-logarithmic converter with temperature compensation

Growing community of inventors

Binago-Como, Italy

Marco DeMicheli