Standard Microsystems Corporation

Other

Robert St Pierre

Scott Cameron McLeod

A temperature sensor circuit and system providing accurate digital temperature readings using a local or remote temperature diode. In one set of embodiments a change in diode junction voltage (&#x394;V) proportional to the temperature of the diode is captured and provided to an analog to digital converter (ADC), which may perform required signal conditioning functions on &#x394;V, and provide a digital output corresponding to the temperature of the diode. DC components of errors in the measured temperature that may result from EMI noise modulating the junction voltage (V) may be minimized through the use of a front-end sample-and-hold circuit coupled between the diode and the ADC, in combination with a shunt capacitor coupled across the diode junction. The sample-and-hold-circuit may sample Vat a frequency that provides sufficient settling time for each Vsample, and provide corresponding stable &#x394;Vsamples to the ADC at the ADC operating frequency. The ADC may therefore be operated at its preferred sampling frequency rate without incurring reading errors while still averaging out AC components of additional errors induced by sources other than EMI.

Proportional settling time adjustment for diode voltage and temperature measurements dependent on forced level current

Current mode charge pumps having improved power consumption characteristics and reduced peak current requirements. The current mode charge pumps utilize a differential transistor pair with a current source providing the tail current for the differential pair. The differential pair alternately steers the current of the current source through first and second fly capacitors, with additional circuitry coupling the opposite fly capacitor, previously charged, to the output of the charge pump. Selection of the tail current provides for matching of circuit performance with the required charge pump output voltage, the load current to be provided thereby and the start time requirements.

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Tucson, AZ, United States of America

Robert St Pierre