| 摘要 |
Systems and methods for implementing a temperature compensated two-stage ring oscillator are described. At least one embodiment includes a system for generating a clock signal comprising a self-starting oscillator comprising two delay stages in a ring configuration. The two-stage ring oscillator is configured to generate the clock signal, wherein the delay stages are configured such that the two-stage ring oscillator has a single right-half plane (RHP) pole in each of the two delay stages where feedback is always positive. For some embodiments, the system further comprises a compensation module configured to sense temperature and process variations and adjust a supply voltage for the two-stage ring oscillator to compensate for temperature and process variations in order to maintain a constant frequency clock signal. For such embodiments, the compensation module comprises a replica circuit configured to mirror operation of the n-channel devices within the two-stage ring oscillator. The compensation module further comprises a constant gm circuit configured to provide a biasing current to the replica circuit, wherein the replica circuit receives the biasing current to generate a reference voltage. The compensation module further comprises a voltage regulator configured to receive the reference voltage from the replica circuit, wherein the voltage regulator is further configured to provide a supply voltage to the two-stage ring oscillator.
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