Patent ID: 7929366

Claim:
A temperature detector comprising: a temperature-dependent voltage generator including: a primary forward-biased diode providing a temperature-dependent voltage; a primary resistor connected between the primary forward-biased diode and a reference node biased to a temperature-independent voltage to produce a primary current; a secondary forward-biased diode; a secondary resistor connected between the secondary forward-biased diode and an intermediate node; a current mirror connected to the intermediate node, the current mirror replicating the primary current through the secondary resistor to amplify the temperature-dependent voltage; circuitry configured to generate at least one buffered temperature-dependent voltage from the amplified temperature-dependent voltage; a ring oscillator configured to generate a clock signal, wherein a clock rate of the clock signal is affected by the at least one buffered temperature-dependent voltage; a timer configured to generate a time-out signal, wherein the time-out signal is affected by the at least one buffered temperature-dependent voltage; and a clock driven recorder having a clock input, wherein the clock input is in response to the clock signal and time-out signal, and the clock-driven recorder is used to estimate a temperature reading.