Abstract: A magnetic sensor device (1000) for sensing magnetic particles (15), the magnetic sensor device (1000) comprising a first magnetic field generator unit (12) excitable for generating a first magnetic field, a sensing unit (11) adapted for sensing a signal indicative of the presence of the magnetic particles (15) in the first magnetic field, a second magnetic field generator unit (1001) adapted for generating a second magnetic field affecting the sensing unit (11), and a processing circuitry (1002) adapted for processing the signal to form a digitized signal and adapted for feeding back the processed signal to the second magnetic field generator unit (1001).

Abstract: A device has a first operational state for writing information onto a record carrier and a second operational state for reading information from a record carrier. The device includes a phase-locked loop for generating a clock signal from a reference signal and a control unit for generating a pulsed transducer control signal in response to an information signal and the clock signal. The device also includes a generating transducer for generating physically detectable patterns in the record carrier in response to the transducer control signal and a read transducer for generating a read signal in response to physically detectable patterns in the record carrier in the second operational state that includes a radiation source. The device further includes a power supply which supplies the radiation source with an electric power. The phase-locked loop includes a memory for memorizing, in the first operational state, a memory value which is a measure of the supplied clock signal.

Abstract: A PWM amplifier comprising a comparator and an integrator is known to amplify, for example, audio signals. One drawback of the known PWM amplifiers is the maximally achievable loop gain is low. To overcome the disadvantages of the prior art PWM amplifiers, a PWM amplifier is provided with a second integrator in the feedback loop.

Abstract: The device for amplifying digital signals includes an input electrode (10) for receiving a digital signal. The device further includes a subtraction unit (12) for subtracting at least two signals from each other, and the input electrode (10) is coupled to a first input (11) of the subtraction unit (12). The device also includes a time-continuous loop filter (14) coupled to an output of the subtraction unit (12), and a time-continuous comparator (16) and a switching amplifier (18) which are coupled in cascade to the time-continuous loop filter. The device additionally includes an output electrode (20) which is coupled to an output (22) of the switching amplifier (18). This output (22) of the switching amplifier (18) is also coupled to a second input (13) of the subtraction unit (12).

Abstract: An integrated circuit (IC) comprising an oscillator (OSC) has a first amplifier (AMP.sub.1) and a second amplifier (AMP.sub.2). The first and the second amplifier (AMP.sub.1, AMP.sub.2) each have a non-inverting input, an inverting input, and an output. The output of the first amplifier (AMP.sub.1) is connected to the non-inverting input of the first amplifier (AMP.sub.1) and also to the non-inverting input of the second amplifier (AMP.sub.2). The output of the second amplifier (AMP.sub.2) is connected to the inverting input of the first amplifier (AMP.sub.1) and also to the inverting input of the second amplifier (AMP.sub.2). The first amplifier (AMP.sub.1) is loaded with a capacitor (C) connected between the output of the first amplifier (AMP.sub.1) and an external power supply terminal (1). The second amplifier (AMP.sub.2) is loaded with a further capacitor (C.sub.F) connected between the output of the second amplifier (AMP.sub.2) and the external power supply terminal (1).

Abstract: A first signal processor stage of an audio amplifier arrangement influences the signal strength of a received audio signal for at least part of the frequency range of the received audio signal. An output amplifier stage amplifies the audio signal influenced by the first signal processor stage. The audio amplifier arrangement further includes a transformer having a primary winding connectable to a mains voltage and having a secondary winding connected to an AC/DC converter whose outputs are connected to at least the output amplifier stage for feeding the output amplifier stage. A detection circuit generates a detection signal (Vms) which is related to the power load of the transformer. An analysis circuit detects in response to the detection signal whether the rise in temperature occurring in the transformer due to the power load has exceeded a specific norm.