8results about How to "Small temperature drift" patented technology

The application relates to the field of semiconductor integrated circuit design and manufacturing, in particular to a Hall resistance network and a forming method thereof. The Hall resistance network at least comprises a first Hall element and a Hall compensation network, the first Hall element and the Hall compensation network are connected in series, the Hall compensation network is used for compensating temperature drift of the first Hall element in a constant voltage driving mode, and the Hall compensation network at least comprises a second Hall element. The direction of a resistance temperature coefficient of the second Hall element is opposite to the direction of a resistance temperature coefficient of the first Hall element, and the resistance values of the first Hall element and the second Hall element are not equal. The Hall resistance network has the advantages of low cost and simple manufacturing, can realize low temperature drift in the constant voltage driving mode without increasing additional circuit design, and can be applied to the field of high-precision sensing with low temperature drift.

The application provides a self-bias instrument input stage circuit based on a bipolar process, belonging to the technical field of instrument input circuits, wherein an input end of a bias current compensation circuit is connected with an output end of a mirror constant current source circuit, and an output end of the bias current compensation circuit is connected with an input stage circuit; an input end of the input stage circuit is connected with an external signal input end and the output end of the bias current compensation circuit, and the input end of the input stage amplifier circuit is also connected with a P-tube proportional current source and an N-tube proportional current source output by the mirror current source circuit. Through the improved design, the current flowing through the collection tube N2 and the current flowing through the target tube N1 are determined by the P-type current source, the VCE voltages of P2 and P10 tubes are controlled to be basically consistent, the influence of the base width modulation effect is reduced, the compensation accuracy is greatly ensured, the bias current required by the input stage from the outside is reduced, and the bias current temperature drift is reduced.

This application provides an analog front-end chip, an analog front-end circuit, and a signal processing device, including: a first operational amplifier module for amplitude adjustment of an electrical signal connected to a first input impedance network; and a second operational amplifier module for amplitude adjustment of an electrical signal connected to a second input impedance network. The second input impedance network has a different impedance than the first input impedance network. The first and second operational amplifier modules are integrated within the same chip. This solves the problem of parasitic capacitance and resistance sensitivity caused by external chip interconnections; avoids the influence of process deviations on the bandwidth of the signal transmission path; and easily achieves high bandwidth performance for the analog front-end circuit. Simultaneously, since all critical signal paths are within a single chip, the temperature characteristics are consistent, resulting in minimal system temperature drift.

This invention belongs to the field of integrated circuits, and specifically relates to a voltage reference circuit with a wide input range. The circuit structure includes a bias circuit and a reference voltage circuit. The input terminal of the bias circuit is connected to a resistor R0 and a power supply, respectively, and the output terminal is connected to the input terminal of the reference voltage circuit. The other end of the resistor R0 is connected to the negative terminal of a diode and the input terminal of the reference voltage circuit, respectively. The positive terminal of the diode is grounded. This invention proposes a novel voltage reference circuit with a wide input voltage range, which generates an output voltage with low temperature drift, simple structure, low design complexity, and small chip area.

This application relates to the field of chip testing, and in particular to a test board, a test machine, and a test system for a tester. The test board includes a BE board, a PCB board, and a heat sink, stacked sequentially from bottom to top. The PCB board includes at least one test channel, which includes an analog area and a power area. A temperature sensor is provided in the analog area, and at least one heating element corresponding to the power area is provided on the heat sink. A control module is provided on the BE board, which is electrically connected to the temperature sensor and the heating element. The control module is used to acquire the temperature data of the analog area collected by the temperature sensor and to control the heating element according to the temperature data to keep the temperature of the analog area stable within a set range. This application uses air cooling coupled with active temperature control to control the temperature of the analog area, reducing the temperature drift of heat-sensitive devices in the test board during actual operation, thereby improving the output performance of the test board.

The application relates to the technical field of electric actuators, in particular to an absolute positioning method for an electric actuator, which solves the problems that the photoelectric encoder with zero point in the prior art needs to be powered to find zero, the absolute photoelectric encoder is constrained by the size of the electric actuator, the positioning resolution is not high, and the cost is relatively high; and the magnetic encoder is similar to the photoelectric encoder and belongs to a non-contact position sensor, and does not have the problem of abrasion. The absolute positioning method for the electric actuator comprises the cooperation of a relative photoelectric encoder and a high-line digital code disc, two relative encoder reading heads, and encoding relative code tracks, and the relative encoder reading heads and the encoding relative code tracks are used to acquire position increment information; two absolute zero point reading heads are used in cooperation, and the absolute position information is acquired through the characteristic code of the absolute zero point code track. The application realizes the above-mentioned high-precision absolute positioning by manufacturing a specific code disc and adding a power-off saving related circuit, and has the advantages of long service life, high precision, low temperature drift, compact structure and low cost.

The invention discloses an aircraft tire pressure sensor, relates to the technical field of aircraft tire pressure monitoring, and can realize accurate monitoring of aircraft tire pressure under extreme working conditions. The sensor comprises a pressure sensor probe and a pressure regulator electrically connected with the pressure sensor probe; the pressure sensor probe comprises a temperature sensitive element and a pressure sensitive element, and the pressure sensitive element comprises a metal elastic membrane and a pressure detection circuit deposited on the metal elastic membrane by adopting a sputtering thin film process; the pressure sensor probe is used for detecting the tire pressure and the tire temperature and transmitting a detected pressure signal and a detected temperature signal to the pressure regulator; and the pressure regulator is used for performing signal modulation and error compensation processing on the pressure signal and the temperature signal to obtain a current signal for detecting pressure, and transmitting the current signal to the tire pressure monitoring system.

This invention discloses an IGBT gate driving circuit and its switching method based on a constant current source and VCCS feedback, relating to the field of integrated circuit technology. The circuit includes a control enable module, a constant current source driving module, a current change rate detection and current extraction feedback module, and a voltage change rate detection and current injection feedback module. The control enable module integrates a Miller window comparator circuit and is connected to the constant current source driving module, the current change rate detection and current extraction feedback module, and the voltage change rate detection and current injection feedback module, respectively. The current output terminal of the constant current source driving module is connected to the IGBT gate. The current change rate detection and current extraction feedback module is connected to the IGBT gate. The Miller window valid signal output terminal of the control enable module is connected to the enable logic terminal of the voltage change rate detection and current injection feedback module. The voltage change rate detection and current injection feedback module is connected to the IGBT gate. This achieves the effect of suppressing turn-on current overshoot and turn-off voltage spikes.