Stmicroelectronics S.r.l.

Domenico Cristaudo

Stefano Corradi

Roberto Antonio Canegallo

Marco Tartagni

Marco Marchesi

Aldo Romani

Marco Crescentini

Giuseppe Palmisano

Antonino Scuderi

Giovanni Conti

Giuseppe Calcagno

Gioacchino Lo Iacono

Daniele Battaglia

Stefano Sueri

A differential amplifier generates an output voltage waveform exhibiting a slew rate over a rise time. The amplifier is powered from a dc voltage input and includes a set of differential pairs having a bias current flowing therethrough and a Miller compensation capacitance. A comparator functions to compare a voltage at the dc voltage input against a reference voltage in order to detect when the voltage drops below the reference voltage. A gain stage controls the gain of the differential amplifier and a bias current control circuit controls the bias current of the differential amplifier. In response to the detection by the comparator of the voltage dropping below the reference voltage, the gain stage and the bias current control circuit decrease the gain of the amplifier and jointly decrease the bias current in order to maintain a value of the rise time.

Method of controlling amplifiers, corresponding circuit and device

A Hall sensor may include a Hall sensing element configured to produce a Hall voltage indicative of a magnetic field when traversed by an electric current, and a first pair of bias electrodes mutually opposed in a first direction across the Hall sensing element. The Hall sensor may include a second pair of bias electrodes mutually opposed in a second direction across the Hall sensing element. The Hall sensor may include a first pair of sensing electrodes mutually opposed in a third direction across the Hall sensing element, and a second pair of sensing electrodes mutually opposed in a fourth direction across the Hall sensing element. The fourth direction may be orthogonal to the third direction, each sensing electrode being between a bias electrode of the first pair and a bias electrode of the second pair.

Hall sensor and sensing method, and corresponding device

A boost converter receives an input voltage and provides an output voltage and includes a power switch and a voltage control circuit configured to drive the power switch as a function of the output voltage. A voltage sensing circuit in the form of a voltage divider is coupled to sense the output voltage and provide a feedback voltage. The voltage control circuit drives the power switch. An electronic control switch is configured to selectively connect the voltage divider to sense the output voltage as a function of an enable signal generated by a timer circuit. The enable signal is pulsed such that the voltage divider is periodically connected to sense the output voltage during a first time and is disconnected from sensing during a second time.

Boost converter and related integrated circuit

A bidirectional switch includes a pair of transistors, with each transistor including a source connected via a degeneration resistance to a common source control node, a gate connected to a common gate control node, a drain connected to a respective channel or gate line and to a charge storage node, respectively, and a clamp diode connected between the source and the gate. This forms a single charge transfer path between gate lines sequentially activated by a scan driver of an LCD panel, and implements a charge sharing technique for reducing power dissipation.

Charge-sharing path control device for a scan driver of an LCD panel

A control circuit is for generating upper and lower voltages that define a range of a data voltage for controlling a driving transistor of an electroluminescent component coupled to a supply line through the driving transistor. The control circuit may include a first input terminal configured to have a common voltage, and a pair of amplifiers coupled together at the first input terminal and configured to generate the upper voltage and the lower voltage to correspond to a difference between the common voltage and, respectively, first and second analog intermediate voltages representing respective threshold values of the upper voltage and of the lower voltage. The control circuit may include an auxiliary amplifier configured to adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and generate the common voltage to correspond to the difference between the input voltage and a reference voltage.

Method of controlling an electroluminescent display and related control circuit

The present invention describes a device for detecting the power of a first signal at a given frequency. The device comprises a first circuit means for detecting the envelope of the first signal and a second circuit means coupled to the first circuit means and suitable for generating a second signal proportional to the average of the envelope detected. The second signal is proportional to the square root of the average power of the first signal.

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Tremestieri Etneo, Italy

Domenico Cristaudo