A vehicle analog comparator circuit for communication interfaces designed to detect an actuation of an actor. The circuit comprises a unit for producing a supply voltage for supplying the actor, a unit for producing a reference voltage to be compared with the supply voltage, a transistor input stage, a node point EDMx between the actor, the unit for producing a supply voltage and the transistor input stage, and a digital evaluation unit to process the output signal from the transistor input stage such that whether or not the actor is actuated is detected. The transistor input stage comprises a transistor circuit with a first transistor is connected to the node point EDMx, and a second transistor connected to the reference voltage. A collector resistance for limiting the collector current of the second transistor, as well as a base resistance for the two transistors. Alternatively, a current mirror is provided.

A circuit for processing a logic input, including a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage and otherwise at a second output logic level different from the first output logic level. The power supply of the first comparator and the first voltage reference are activated by the logic input.

A comparator circuit's signal range can be enhanced using an input signal attenuation circuit. In an example, a comparator circuit receives an input signal and a reference signal. The input signal can be conditioned by one or both of the attenuation circuit and a conditioning circuit, and a resulting conditioned signal can be presented to a compare element. Under first operating conditions where the input signal is approximately equal to the reference signal, the attenuation circuit can be substantially bypassed and a first resulting conditioned signal can be presented to the compare element. Under second operating conditions where the input signal is substantially greater than the reference signal, the attenuation circuit receives a portion of the input signal and a different second resulting conditioned signal can be presented to the compare element.

A vehicle analog comparator circuit for communication interfaces designed to detect an actuation of an actor. The circuit comprises a unit for producing a supply voltage for supplying the actor, a unit for producing a reference voltage to be compared with the supply voltage, a transistor input stage, a node point EDMx between the actor, the unit for producing a supply voltage and the transistor input stage, and a digital evaluation unit to process the output signal from the transistor input stage such that whether or not the actor is actuated is detected. The transistor input stage comprises a transistor circuit with a first transistor is connected to the node point EDMx, and a second transistor connected to the reference voltage. A collector resistance for limiting the collector current of the second transistor, as well as a base resistance for the two transistors. Alternatively, a current mirror is provided.

Various embodiments relate to an amplitude shift keying (ASK) demodulator for demodulating an input signal, including: a frequency filter configured to receive the input signal, wherein the frequency filter includes adjustable components configured to adjust the frequency response of the frequency filter; a rectifier configured to rectify an output of the frequency filter, wherein the rectifier includes an adjustable current source configured to adjust the current consumption of the rectifier; a reference signal generator configured to produce a reference signal; a current to voltage converter configured to convert the current of the rectified signal to a rectified voltage and to convert the current of the reference signal to a reference voltage; and a comparator configured to compare the rectified voltage to the reference voltage and to produce a demodulated output signal.

Various embodiments relate to an amplitude shift keying (ASK) demodulator for demodulating an input signal, including: a frequency filter configured to receive the input signal, wherein the frequency filter includes adjustable components configured to adjust the frequency response of the frequency filter; a rectifier configured to rectify an output of the frequency filter, wherein the rectifier includes an adjustable current source configured to adjust the current consumption of the rectifier; a reference signal generator configured to produce a reference signal; a current to voltage converter configured to convert the current of the rectified signal to a rectified voltage and to convert the current of the reference signal to a reference voltage; and a comparator configured to compare the rectified voltage to the reference voltage and to produce a demodulated output signal.

A circuit for processing a logic input, including a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage and otherwise at a second output logic level different from the first output logic level. The power supply of the first comparator and the first voltage reference are activated by the logic input.

A particular apparatus includes a magnetic tunnel junction (MTJ) device and a transistor. The MTJ device and the transistor are included in a comparator that has a hysteresis property associated with multiple transition points that correspond to magnetic switching points of the MTJ device.

A comparator circuit's signal range can be enhanced using an input signal attenuation circuit. In an example, a comparator circuit receives an input signal and a reference signal. The input signal can be conditioned by one or both of the attenuation circuit and a conditioning circuit, and a resulting conditioned signal can be presented to a compare element. Under first operating conditions where the input signal is approximately equal to the reference signal, the attenuation circuit can be substantially bypassed and a first resulting conditioned signal can be presented to the compare element. Under second operating conditions where the input signal is substantially greater than the reference signal, the attenuation circuit receives a portion of the input signal and a different second resulting conditioned signal can be presented to the compare element.

A zero-crossing voltage detection circuit for detecting a phase voltage of a converter includes a comparator, a first transistor and a second transistor. The first transistor has a first base, a first collector and a first emitter. The first base couples with the first collector. The first emitter receives the phase voltage. The first collector provides a first voltage to a first terminal of the comparator. The second transistor has a second base, a second collector and a second emitter. The second base couples with the first base. The second base couples with the second collector. The second emitter receives a ground voltage. The second collector provides a second voltage to a second terminal of the comparator. The comparator compares the first voltage with the second voltage to generate a zero-crossing voltage signal.