RING OSCILLATORS FOR TEMPERATURE DETECTION IN WIDEBAND SUPPLY NOISE ENVIRONMENTS

摘要

A temperature identification system may include temperature sensing circuitry and a temperature measurement module. The temperature sensing circuitry may include a ring oscillator that generates a ring oscillator output signal having a frequency that varies depending on an operating temperature on the ring oscillator. A frequency divider circuit may divide the frequency of the ring oscillator output signal such that two or more cycles of a noise component of supply voltage are averaged, which may reduce the impact that the noise has on the frequency of the ring oscillator output signal. In some embodiments, a regulator may supply a regulated voltage to the ring oscillator. The regulator may reduce the impact of the noise for low frequency components of the noise, while the frequency divider may reduce the impact for high frequency of the noise.

主权项

1. A temperature identification system comprising:
a temperature measurement module; and temperature sensing circuitry comprising:
a ring oscillator circuit configured to generate a ring oscillator signal; anda divider configured to:
receive the ring oscillator signal from the ring oscillator circuit;divide a frequency of the ring oscillator signal by a divider value to generate a divider signal; andoutput the divider signal to the temperature measurement module, wherein the temperature measurement module is configured to determine an operating temperature of the ring oscillator circuit based on the divider signal.