Patent ID: 8717109
Filing Date: 2014-05-06
Classification: H03L

Abstract:
1. A temperature invariant circuit comprising: an internal circuit configured to generate an output signal, wherein the output signal is sensitive to a silicon temperature; a temperature sensor configured to monitor the silicon temperature and output a current temperature signal; a decision logic circuit, coupled to the temperature sensor, configured to compare the current temperature signal with a predetermined value to generate a plurality of temperature control signals based on the comparison; a temperature conditioner, coupled to the decision logic circuit, configured to increase or reduce the silicon temperature according to the plurality of temperature control signals, wherein the temperature conditioner comprises a plurality of temperature adjusting elements each configured to receive corresponding temperature control signals, and wherein each of said temperature adjusting elements operates in one of a voltage mode or a current mode when enabled; and a digitally controlled oscillator comprising an inductor-capacitor (LC) tank and a plurality of tuning circuit elements comprising variable capacitors, wherein an oscillating frequency of the digitally controlled oscillator is based on a capacitance in the LC-tank and a sum of variable capacitance values of the tuning circuit elements; wherein a stabilization of the silicon temperature is achieved with the temperature sensor, the decision logic circuit, and the temperature conditioner; and wherein an increasing number of temperature adjusting elements is disabled when the temperature invariant circuit exits a power down mode and if a power delivered from the temperature sensor is greater than a default value, wherein the increasing number of temperature adjusting elements are disabled according to a timer.