A current detection circuit includes normally-on-type and a first normally-off-type switching elements with main current paths that are connected in series, and a second normally-off-type switching element that has a source and a gate that are connected to a source and a gate of the first normally-off-type switching element and a drain that is connected to a constant current source, and executes a division process by using drain voltages of the two normally-off-type switching elements.

Control device for aerosol inhalation device includes operational amplifier for performing output according to voltage applied to load for heating aerosol source and having correlation between temperature and electrical resistance value, control unit for performing processing based on the voltage according to the output, diode having anode electrically connected to one of inverting input terminal and noninverting input terminal, and circuit for electrically connecting power supply and the load. The circuit is formed by first region, and second region in which maximum voltage is lower than that in the first region, or applied voltage is lower than that to the first region. Of the inverting input terminal and the noninverting input terminal, terminal to which the anode of the diode is electrically connected is electrically connected to the first region.

Control device for aerosol inhalation device, includes operational amplifier including output terminal configured to generate voltage according to voltage applied to load configured to heat aerosol source and having correlation between temperature and electrical resistance value, control unit including input terminal and configured to perform processing based on voltage applied to the input terminal, and voltage dividing circuit configured to electrically connect the output terminal of the operational amplifier and the input terminal of the control unit. Power supply voltage of the operational amplifier is higher than power supply voltage of the control unit, and equals voltage applied to aerosol generation circuit including the load, and one of inverting input terminal and noninverting input terminal of the operational amplifier is electrically connected to the aerosol generation circuit.

An automatic gain control (AGC) transimpedance amplifier (TIA) uses a differential structure with feedback PIN diodes to adjust the loop gain of the amplifier automatically to maintain stability over a wide dynamic range when converting optical power using a photodiode to an electrical signal. A stable DC current derived from the photodiode current sets the voltage gain of the amplifier. The use of ultra-linear long carrier lifetime PIN diodes assures the transimpedance feedback resistance is linear. The AGC function adjusts the gain of the TIA to provide a linear stable differential transresistance controlled by the photodiode current; a linear stable AGC function using current supplied by the photodiode; an improvement of about 10 db of the transresistance dynamic range; and reduces the need for internal and external circuitry needed to provide the same function. The TIA is applicable to CATV optical systems which have very strict linearity requirements.

A method for rapidly gathering a sub-threshold swing from a thin film transistor is provided. The method includes: electrically connecting an operational amplifier and an anti-exponential component to a source terminal of the thin film transistor; performing a measuring process to the thin film transistor in which the measuring process is inputting multiple values of a gate voltage to a gate terminal, such that multiple values of an output voltage are correspondingly generated from the output terminal of the operational amplifier; and performing a fitting process to the output voltage corresponding to the thin film transistor in which the fitting process is fitting at least two of said multiple values of the output voltage to get the sub-threshold swing.

A pseudo-resistor structure, comprises: a first and a second PMOS transistor or PN diode configured as two-terminal devices, wherein the positive terminal of the first PMOS transistor or PN diode is connected to the positive terminal of the second PMOS transistor or PN diode, and wherein the negative terminal of the first PMOS transistor or PN diode is connected to an input (A) of the pseudo-resistor structure and wherein the negative terminal of the second PMOS transistor or PN diode is connected to an output (C) of the pseudo-resistor structure, and a dummy transistor or dummy diode connected to the input (A), wherein the dummy transistor or dummy diode is further connected to a bias voltage for compensating a leakage current through the first and the second PMOS transistors or PN diodes. A closed-loop operational amplifier circuit comprising the pseudo-resistor structure is provided. Also, a bio-potential sensor comprising the closed-loop operational amplifier circuit is provided.

The present disclosure provides a protection circuit and a display panel. The protection circuit comprises: a power supply circuit for outputting a first voltage; an overvoltage protection circuit connected to the power supply circuit for feedback regulation of the first voltage, such that a first protection voltage outputted by the overvoltage protection circuit is maintained within a preset range; and an output regulator circuit connected to the overvoltage protection circuit for regulated output of a second protection voltage. Through the above embodiments, the present disclosure can always stabilize the outputted voltages within a preset range to achieve the purpose of providing a stable voltage for the display panel, thereby realizing accurate and rapid overvoltage protection of the display panel.

A circuit for amplifying signals from a Micro Electro-Mechanical System (MEMS) capacitive sensor is provided. First and second input nodes receive a sensing signal applied differentially between the input nodes. A first amplifier stage and a second amplifier stage, respectively, produce a differential output signal between first and second output nodes. A common mode signal is detected at the output nodes. A voltage divider having an intermediate tap node is coupled between the first output node and the second output node. A feedback stage is coupled between the intermediate tap node of the voltage divider and the inputs of the first amplifier stage and the second amplifier stage, where the feedback line is sensitive to the common mode signal at the output nodes.

A metal detector for buried and corroded pipeline is provided, comprising: a transmitting coil configured to transmit a detection signal to a pipeline; a frequency selection unit electrically connected to the transmitting coil for regulating a frequency of the detection signal; two receiving coils respectively and symmetrically disposed at two opposite sides of the transmitting coil for respectively receiving a reflected signal returned from the pipeline; an analog-digital conversion unit respectively and electrically connected to the two receiving coils for converting the reflected signal into a digital signal; and a control unit electrically connected to the analog-digital conversion unit. In the present disclosure, by comparing intensities of the reflected signals received by the two receiving coils, it can be efficiently and accurately determined whether corrosion has occurred to the pipeline.

A current detection circuit has a differential amplification circuit that outputs a differential output current dependent on a voltage difference between input terminals and first and second feedback circuits that output a detection current in response to the differential output current and form a feedback path to each input terminal of the differential amplification circuit. First and second MOS transistors that generate voltages dependent on respective source-drain voltages at a time when drain currents in a forward direction and a backward direction flow through an output MOS transistor are connected to respective input terminals of the differential amplification circuit.