ACCEL SEMICONDUCTOR (SHANGHAI) LIMITED Patent applications |
Patent application number | Title | Published |
20100045388 | Accuracy on-chip clock generator for multi-clock driven single chip solution - A mixed-signal chip is described. The mixed-signal chip comprises a first portion of analog circuit and second portion of digital circuit, an on-chip precision oscillator residing on the first analog portion, the precision oscillator has a precision frequency; a first on-chip non-precision tunable oscillator from a first clock domain residing on the first analog portion, the first non-precision tunable oscillator has a first adjustable frequency; a noise detector for detecting a first noise in the first clock domain; a frequency adjusting register for storing a first desired frequency value of the first on-chip non-precision tunable oscillator, wherein the first desired frequency value is determined based on the first detected noise; a control circuit for adjusting the adjustable frequency of the first non-precision tunable oscillator to the first desired frequency value by using the precision frequency of the on-chip precision oscillator as a reference. | 02-25-2010 |
20090063081 | BRIDGE SENSOR CALIBRATION - An integrated circuit chip for calibrating a bridge sensor is described. The integrated circuit (IC) comprises a voltage regulator for providing a voltage to drive the sensor and the integrated circuit; a temperature sensor for measuring a temperature of the environment; a programmable gain amplifier having inputs connected to the sensor for receiving differential outputs of the sensor; a programmable offset generator for performing analog coarse calibration of the bridge sensor offset by providing an offset value to the input of the programmable gain amplifier; an analog multiplex selects either the programmable gain amplifier output or the environment temperature measurement from the temperature sensor as output; a high resolution analog-to-digital converter quantizes the output of the analog multiplex; a processor for performing digital fine calibration by calculating calibration coefficients for a selected set of parameters including the offset of the bridge sensor, temperature coefficients of the bridge sensor sensitivity and nonlinearity of the sensitivity; and a digital memory unit for storing the coarse calibration offset value and the calculated fine calibration coefficients. | 03-05-2009 |