A radio frequency (RF) power detector with a variable threshold for dynamic power detection. The RF power detector includes stacked transistors of an input stage and stacked transistors of an output stage. A DC bias voltage plus an input RF signal are applied to a control electrode on the input stage and the same DC bias voltage plus an additional DC bias voltage are applied to a control electrode on the output stage. Depending on the input power of the RF signal, a Δ current is generated in the output stage, and the output capacitor is either charged or discharged, and the output capacitor voltage is compared to a threshold to generate an output signal. The output signal may be averaged over time by two capacitors, miller capacitor and output capacitor. The output voltage of the RF power detector is an integration over time of the input RF power.

A radio frequency (RF) power detector with a variable threshold for dynamic power detection. The RF power detector includes stacked transistors of an input stage and stacked transistors of an output stage. A DC bias voltage plus an input RF signal are applied to a control electrode on the input stage and the same DC bias voltage plus an additional DC bias voltage are applied to a control electrode on the output stage. Depending on the input power of the RF signal, a Δ current is generated in the output stage, and the output capacitor is either charged or discharged, and the output capacitor voltage is compared to a threshold to generate an output signal. The output signal may be averaged over time by two capacitors, miller capacitor and output capacitor. The output voltage of the RF power detector is an integration over time of the input RF power.

A device of detecting a current from a sensor is disclosed. The device includes an integrating circuit including a network of capacitors for providing a gain setting and configured to convert the current to a voltage ramp over a length of integration time, the integrating circuit further including a reset switch configured to connect an input and an output of the network of capacitors; an ADC configured to digitize the voltage ramp into a plurality of voltage samples; and a set of modules including an analyzing module configured to analyze the plurality of voltage samples to determine a slope of the voltage ramp; an outputting module configured to determine a magnitude of the current based on the slope of the voltage ramp and the gain setting; and a reconfiguring module that is configured to reconfigure the network of capacitors and reset the voltage ramp via the reset switch.

A voltage monitoring device 2 includes: a comparator circuit 31; a state determination circuit 32; a pulse pattern setting circuit 33; an output circuit 36; a VDD port 21; a VSS port 22; an input port 24; and an output port 23. The comparator circuit 31 is connected to the state determination circuit 32. The state determination circuit 32 is connected to the pulse pattern setting circuit 33. The pulse pattern setting circuit is connected to the output port 23 via the output circuit 36.

An object is to provide a new electronic control unit that can improve detection accuracy of a sense current even in a region where the current value of the sense current is small. Provided is a sense current detection unit including a plurality of sense transistors that have different current flow rates and that are connected to current output transistors controlling a current flowing in a coil load. The current in the sense current detection unit is input to an analog/digital converter, and the current value of the current flowing in the sense current detection unit is converted into a digital value. The current value of the current flowing in the sense current detection unit is increased through a combination or a selection of the plurality of sense transistors of the sense current detection unit in a region where the current value of the main current of the current output transistors is small compared to a region where the current value of the main current is large.

A current detection module capable of differentiating and quantifying contribution to a current signal generated by a sensor in response to stimulation by a certain target source from contributions from sources other than the target source (ambient sources) is disclosed. As long as the contribution from the target source comprises a pulsed signal, the module may synchronize itself to the pulse(s) so that there is a predetermined phase relationship between the pulse(s) and functions carried out by various stages of the module. The module may be re-used to also detect and quantify contributions from ambient sources by presenting these contributions to the module as pulses that trigger synchronization of the module. To that end, a detection system disclosed herein is based on the use of such current detection module and allows mode switching where, depending on the selected mode of operation, the module is configured to perform different measurements.

A current detection module capable of differentiating and quantifying contribution to a current signal generated by a sensor in response to stimulation by a certain target source from contributions from sources other than the target source (ambient sources) is disclosed. As long as the contribution from the target source comprises a pulsed signal, the module may synchronize itself to the pulse(s) so that there is a predetermined phase relationship between the pulse(s) and functions carried out by various stages of the module. The module may be re-used to also detect and quantify contributions from ambient sources by presenting these contributions to the module as pulses that trigger synchronization of the module. To that end, a detection system disclosed herein is based on the use of such current detection module and allows mode switching where, depending on the selected mode of operation, the module is configured to perform different measurements.

A method for measuring temperature includes: measuring a current voltage corresponding to a thermistor based on a current resistor that is connected in series with the thermistor in the crystal oscillator, wherein the current resistor is any one of resistors in a resistor array; switching the resistor into another resistor in the resistor array, enabling the another resistor to be connected in series with the thermistor, based on a preset switching rule, when the current voltage is greater or lower than a preset voltage range, until a target resistor in the resistor array is connected in series with the thermistor, and a target voltage corresponding to the thermistor is measured to be within the preset voltage range; and determining temperature of the crystal oscillator based on connected power supply voltage, the target resistor and the target voltage.

A method for measuring temperature includes: measuring a current voltage corresponding to a thermistor based on a current resistor that is connected in series with the thermistor in the crystal oscillator, wherein the current resistor is any one of resistors in a resistor array; switching the resistor into another resistor in the resistor array, enabling the another resistor to be connected in series with the thermistor, based on a preset switching rule, when the current voltage is greater or lower than a preset voltage range, until a target resistor in the resistor array is connected in series with the thermistor, and a target voltage corresponding to the thermistor is measured to be within the preset voltage range; and determining temperature of the crystal oscillator based on connected power supply voltage, the target resistor and the target voltage.

Embodiments relate to sensing a current provided by a power supply circuit. The current sensing circuit includes a sense transistor for sensing the current provided by a main transistor, a driver for controlling a bias provided to the sense transistor and the main transistor, and a sense resistor for converting the sensed current to a voltage value. Moreover, the current sensing circuit includes a controller that modifies at least one of: (a) a resistance of the main transistor by adjusting the bias voltage provided by the driver, (b) a gain ratio between a load current and a sensing current by adjusting a number of individual devices that are active in the sense transistor, and (c) a resistance of the sense resistor.