摘要:
A system, device, and method for minimizing x-axis and/or y-axis offset shift due to internally produced as well as externally produced on chip temperature imbalances. At least one temperature gradient canceling device is disposed on a substrate including a temperature gradient sensitive device having at least one pair of sensors. Voltage signals generated by the temperature gradient canceling devices can be combined with voltage signals generated by each of the pair of sensors to account for the offset.
摘要:
A system, device, and method for minimizing x-axis and/or y-axis offset shift due to internally produced as well as externally produced on chip temperature imbalances. At least one temperature gradient canceling device is disposed on a substrate including a temperature gradient sensitive device having at least one pair of sensors. Voltage signals generated by the temperature gradient canceling devices can be combined with voltage signals generated by each of the pair of sensors to account for the offset.
摘要:
A power-on-reset (POR) circuit having a zero or substantially zero current state while the supply voltage is in a predetermined, valid range is disclosed. The POR circuit includes a state machine, an oscillator, and output circuitry that are electrically coupled to one another and to a supply voltage. Output from the output circuitry is also provided to the integrated circuit to which the POR circuit is coupled. The state machine includes a plurality of sequential circuits such as latches, flip-flops, and the like that are electrically coupled in a cascade, to provide a ripple counter. The output circuitry is structured and arranged to reset or initialize all of the logic elements on the chip by generating a POR output logic HI (1) signal by Boolean operation of the logic circuitry signal of the state machine for all Boolean states except one. The oscillator is disabled when the POR output logic signal is LO (0), which causes the POR circuit to enter a zero or substantially zero current state.
摘要:
A thermal accelerometer device that provides a compensation for sensitivity variations over temperature. The thermal accelerometer includes signal conditioning circuitry operative to receive analog signals representing a differential temperature is indicative of a sensed acceleration. The signal conditioning circuitry includes serially connected A-to-D and D-to-A converters, which implement a temperature dependent function and process the received signals to provide a compensation for sensitivity variations over a range of ambient temperature. To provide a ratiometric compensation for variations in power supply voltage, a buffered voltage proportional to the supply voltage is provided as a reference voltage to the D-to-A converter. The thermal accelerometer includes a self-test circuit for verifying the integrity of a heater, temperature sensors, and circuitry included within the device.
摘要:
A temperature compensated crystal oscillator with an improved phase noise characteristic and a fast start up time includes a large time constant low-pass filter coupled to a temperature compensation circuit. At start up the low pass filter is effectively bypassed to enable the temperature compensation voltage and oscillator output frequency to settle quickly. A capacitance in the low-pass filter is precharged by a precharge circuit to match the temperature compensation voltage without disturbing the temperature compensation circuit and the concurrent settling of the oscillator. When the capacitance is fully charged, the low-pass filter is enabled without unsettling the oscillator output frequency.