Blakely, Sokoloff, Taylor & Zafman, L.L.P.
Delay stage circuitry for a ring oscillator
 A delay stage for a ring oscillator supplies a first output signal and a second output signal. Each of the first and second output signals has a peak-to-peak voltage swing. The first and second output signals are complementary to each other. The delay stage includes a differential amplifier for generating the first output signal and the second output signal and a voltage clamping circuit for limiting the peak-to-peak voltage swing of the first and second output signals. The voltage clamping circuit is coupled between the first output signal and the second output signal. The differential amplifier includes a first NMOS transistor and a second NMOS transistor for generating the first and second output signals. The differential amplifier also includes a first PMOS transistor and a second PMOS transistor coupled to (1) the first and second NMOS transistors and (2) the voltage clamping circuit for providing bias currents to the first and second NMOS transistors. 
Rambus, Inc.
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Mark A. Wingyu
Horowitz Leung