4114 results about "Temperature coefficient" patented technology

The temperature-compensated film bulk acoustic resonator (FBAR) device comprises an FBAR stack. The FBAR stack comprises an FBAR and a temperature-compensating element. The FBAR is characterized by a resonant frequency having a temperature coefficient, and comprises opposed planar electrodes and a piezoelectric element between the electrodes. The piezoelectric element has a temperature coefficient on which the temperature coefficient of the resonant frequency depends at least in part. The temperature-compensating element has a temperature coefficient opposite in sign to the temperature coefficient of the piezoelectric element.

A battery holder containing positive temperature coefficient (PTC) resetable fuse to electronically limit the maximum current that can be drawn from circuits built using reusable electronic component housings. A power supply with similar housing to reusable battery holders, also designed to limit maximum current and perform electrically equivalent to two or more battery holders. A reusable electronic housing with means for attaching any two leaded electronic component for insertion into quick connect assembly system. This housing also contains a positive temperature coefficient (PTC) resetable fuse to electroniclly limit the maximum current that can be sent through the attached two leaded component.

A voltage reference circuit provides a reference voltage that can be precisely programmed. The threshold voltage of a first non-volatile memory (NVM) transistor is programmed while coupled in parallel with a second NVM transistor. During programming, one or more capacitors are connected between the floating gate of the first NVM transistor and ground, and one or more capacitors are connected between the floating gate of the second NVM transistor and ground. The first and second NVM transistors are then coupled to a differential amplifier, which is used to generate a single-ended reference voltage in response to the programmed threshold voltage of the first NVM transistor. Bipolar transistors are selectively switched between the various capacitors and ground, thereby providing precise adjustment of the temperature coefficient of the voltage reference circuit.

A fuel level sensor for sensing and monitoring the level of remaining fluid in a container such as a fuel tank for a motorized vehicle is disclosed. The fuel level sensor incorporates an improved float and pivot arm member attached to a hub that rotates about a pivot base. The conventional resistor card technology, commonly found in automotive applications for translating the position of the float into an electrical signal, is replaced by a more reliable non-contact magnetic flux sensing circuit. The fuel level sensor incorporates a magnetic sensor and magnetic circuit in a commonly known and practiced rotational position sensor configuration for determining the angular position of a hub relative to its pivot base, where the hub is attached to a conventional float-arm member and the base remains stationary relative to the fuel container. The preferred embodiment includes a magnetic flux sensor positioned between two movable magnets. The magnetic flux sensing element is a Hall effect integrated circuit, magnetoresistor, magnetodiode, magnetotransistor, or similar magnetic flux sensing element with associated electronic circuitry having adjustable or programmable features including ratiometry, gain, offset voltage, temperature coefficient, and output signal range limiting. Critical electronic components are hermetically sealed making the fuel level sensor fully submersible in fuel for long term fuel exposure.