The invention relates to a sensor (1) comprising a pulse generator (2) and an electrode (3) connected to an output of the pulse generator (2). A detector (61) detects a change in the amplitude of the signal being present at the electrode, and a control unit (62) operatively connected to the output of the detector (61), detects the presence of a person interacting with the sensor based on the output signal of the detector (61). Furthermore, the electrode (3) is connected to the pulse generator (2) via an inductive circuit such that the sensor can detect the presence of a user but can also be used as a touch sensor. In one embodiment, the pulse generator (2) via an inductive circuit is adapted to generate a pulse train with repetition rate equal to the resonance frequency of the inductive circuit or to an integer multiple of an octave of said resonance frequency. An automatic faucet (100) using such sensor is further described.

The invention relates to a sensor (1) comprising a pulse generator (2) and an electrode (3) connected to an output of the pulse generator (2). A detector (61) detects a change in the amplitude of the signal being present at the electrode, and a control unit (62) operatively connected to the output of the detector (61), detects the presence of a person interacting with the sensor based on the output signal of the detector (61). Furthermore, the electrode (3) is connected to the pulse generator (2) via an inductive circuit such that the sensor can detect the presence of a user but can also be used as a touch sensor. In one embodiment, the pulse generator (2) via an inductive circuit is adapted to generate a pulse train with repetition rate equal to the resonance frequency of the inductive circuit or to an integer multiple of an octave of said resonance frequency. An automatic faucet (100) using such sensor is further described.

A ringing peak detector module detects a ringing at the output of an inductive load driver including a bridge circuit containing high side and low side switches. A ringing peak detector receives differential feedback signals representative of the drain-source voltage of the low-side switch and detects a ringing peak of an oscillation of a current/voltage on the inductive load. A module compares said detected ringing peak with a maximum value and controls said driver by an error signal calculated as a function of the difference between said peak value and maximum value. The ringing peak detector module includes an input buffer module upstream of said peak detector circuit that shifts the differential feedback signals so a common mode of these signals is centered at a half-dynamic level of a supply voltage to provide correspondingly shifted voltages forming a shifted differential output corresponding to a steady state of the differential feedback signals.

A ringing peak detector module detects a ringing at the output of an inductive load driver including a bridge circuit containing high side and low side switches. A ringing peak detector receives differential feedback signals representative of the drain-source voltage of the low-side switch and detects a ringing peak of an oscillation of a current/voltage on the inductive load. A module compares said detected ringing peak with a maximum value and controls said driver by an error signal calculated as a function of the difference between said peak value and maximum value. The ringing peak detector module includes an input buffer module upstream of said peak detector circuit that shifts the differential feedback signals so a common mode of these signals is centered at a half-dynamic level of a supply voltage to provide correspondingly shifted voltages forming a shifted differential output corresponding to a steady state of the differential feedback signals.

The present disclosure describes aspects of a fast settling peak detector. In some aspects, a peak detector circuit includes a first transistor having a gate coupled to an input of the circuit at which a signal is received and a drain coupled to a source of a second transistor. Current may flow in the first and second transistors responsive to the signal. The circuit also includes a third transistor having a gate coupled, via a signal-inverting component, to the input of the circuit and a drain coupled to a source of a fourth transistor. Through an inversion of the signal, other current flowing in the third and fourth transistor can reduce or cancel a frequency component of the current in the first and second transistors. In some cases, this precludes a need to filter the frequency component from an output of the circuit.

The present disclosure describes aspects of a fast settling peak detector. In some aspects, a peak detector circuit includes a first transistor having a gate coupled to an input of the circuit at which a signal is received and a drain coupled to a source of a second transistor. Current may flow in the first and second transistors responsive to the signal. The circuit also includes a third transistor having a gate coupled, via a signal-inverting component, to the input of the circuit and a drain coupled to a source of a fourth transistor. Through an inversion of the signal, other current flowing in the third and fourth transistor can reduce or cancel a frequency component of the current in the first and second transistors. In some cases, this precludes a need to filter the frequency component from an output of the circuit.

A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. A peak of a primary-side current is detected from the sense voltage. The gate driver has a pair of switches for generating the gate voltage in

A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. A peak of a primary-side current is detected from the sense voltage. The gate driver has a pair of switches for generating the gate voltage in

A metering circuit includes a comparator including a first input to receive an input signal, and including a second input and an output. The metering circuit further includes a reference source to provide a time-varying reference signal to the second input during a peak counting operation.

A metering circuit includes a comparator including a first input to receive an input signal, and including a second input and an output. The metering circuit further includes a reference source to provide a time-varying reference signal to the second input during a peak counting operation.