A method monitors a sensor clock signal in a sensor unit, which is generated and output for a data transfer between the sensor unit and a control unit with a predefined period duration. A reference clock signal having a predefined reference period duration is received. The sensor clock signal is compared to the reference clock signal. Based on the comparison, a deviation of the current period duration of the sensor clock signal from a target period duration is detected. Based on the detected deviation, a counting pulse or a reset pulse is emitted.

An example device comprising: first clock divider circuitry to be coupled to a first clock; first counter circuitry configured to be coupled to the first clock divider circuitry, the first counter circuitry configured to increment based on the first clock and a second clock; second clock divider circuitry to be coupled to a third clock; second counter circuitry configured to be coupled to the second clock divider circuitry, the second counter circuitry configured to increment based on the third clock and the second clock; and comparison circuitry coupled to the first and second counter circuitry.

An example device comprising: first clock divider circuitry to be coupled to a first clock; first counter circuitry configured to be coupled to the first clock divider circuitry, the first counter circuitry configured to increment based on the first clock and a second clock; second clock divider circuitry to be coupled to a third clock; second counter circuitry configured to be coupled to the second clock divider circuitry, the second counter circuitry configured to increment based on the third clock and the second clock; and comparison circuitry coupled to the first and second counter circuitry.

A clock signal generation circuit and method, and an electronic device are provided, relating to the field of communications technology. In the clock signal generation circuit, an initial clock providing circuit (10) can generate an initial clock signal having an initial frequency; a control word providing circuit (20) can determine a target frequency offset of the initial frequency based on a detected target parameter and generate a frequency control word based on the target frequency offset; a target clock generating circuit (30) can generate a target clock signal having a target output frequency based on the frequency control word and the initial clock signal, wherein the target output frequency is negatively correlated with the frequency control word and positively correlated with the initial frequency. It can be learned based on a relationship among the target output frequency and the initial frequency and the frequency control word that flexibly generating the frequency control word can reduce the impact of the target parameter on the frequency of the clock signal finally generated by the clock signal generation circuit.

A clock signal generation circuit and method, and an electronic device are provided, relating to the field of communications technology. In the clock signal generation circuit, an initial clock providing circuit (10) can generate an initial clock signal having an initial frequency; a control word providing circuit (20) can determine a target frequency offset of the initial frequency based on a detected target parameter and generate a frequency control word based on the target frequency offset; a target clock generating circuit (30) can generate a target clock signal having a target output frequency based on the frequency control word and the initial clock signal, wherein the target output frequency is negatively correlated with the frequency control word and positively correlated with the initial frequency. It can be learned based on a relationship among the target output frequency and the initial frequency and the frequency control word that flexibly generating the frequency control word can reduce the impact of the target parameter on the frequency of the clock signal finally generated by the clock signal generation circuit.

A detection circuit is provided in the invention. The detection circuit includes a synchronous circuit, a comparison circuit and a fail-signal generating circuit. The comparison circuit is coupled to the synchronous circuit. The comparison circuit compares a target signal with a reference signal to generate a comparison result. The frequency of the reference signal is lower than the frequency of the target signal. The fail-signal generates circuit is coupled to the synchronous circuit and the comparison circuit. The fail-signal receives the comparison circuit. According to the comparison circuit, the fail-signal determines whether the target signal has failed.

A detection circuit is provided in the invention. The detection circuit includes a synchronous circuit, a comparison circuit and a fail-signal generating circuit. The comparison circuit is coupled to the synchronous circuit. The comparison circuit compares a target signal with a reference signal to generate a comparison result. The frequency of the reference signal is lower than the frequency of the target signal. The fail-signal generates circuit is coupled to the synchronous circuit and the comparison circuit. The fail-signal receives the comparison circuit. According to the comparison circuit, the fail-signal determines whether the target signal has failed.

A system for detecting a connection between two devices includes a first device and a second device. The first device includes a first connection terminal and a first reactance element connected to the first connection terminal. The second device includes a second connection terminal; a first resistance element, and a first frequency generator for allowing a signal to pass through the first resistance element and be applied to the first device via the second connection terminal. The second device further includes a first comparator having both input terminals connected to both ends of the first resistance element, and comparing and outputting a signal of both ends of the first resistance element, and a first control unit for determining whether or not the first connection terminal of the first device is connected to the second connection terminal by means of the output signal of the first comparator.

A system for detecting a connection between two devices includes a first device and a second device. The first device includes a first connection terminal and a first reactance element connected to the first connection terminal. The second device includes a second connection terminal; a first resistance element, and a first frequency generator for allowing a signal to pass through the first resistance element and be applied to the first device via the second connection terminal. The second device further includes a first comparator having both input terminals connected to both ends of the first resistance element, and comparing and outputting a signal of both ends of the first resistance element, and a first control unit for determining whether or not the first connection terminal of the first device is connected to the second connection terminal by means of the output signal of the first comparator.

An envelope detector comprises a first differential transistor pair that receives first and second input signals, a second differential transistor pair that receives third and fourth input signals, a resistor, a current source, and a comparator. The first and second differential pairs each comprise two transistors having first current terminals coupled together and second current terminals coupled together. The resistor is coupled between the second current terminals of the first and second differential pairs. The current source has a first terminal coupled to the second terminal of the resistor and to second current terminals of the second differential pair and a second terminal configured to receive a negative supply voltage. The comparator has a negative input coupled to first current terminals of the first differential pair and a positive input coupled to first current terminals of the second differential pair.