System and method for supporting different types of oscillator circuits
View Patent ↗In accordance with some embodiments of the present disclosure, an oscillator circuit comprises, a first pad associated with a first terminal of an oscillator and a second pad associated with a second terminal of the oscillator. The oscillator is configured to generate an oscillating signal and communicate the oscillating signal from the second terminal to a clock distributor coupled to the second pad. The oscillator circuit further comprises an oscillator gain element comprising an output node coupled to the first pad and an input node coupled to the second pad. The oscillator circuit also comprises a digital-to-analog converter (DAC) coupled to the first pad. The oscillator circuit additionally comprises a switching circuit coupled to the gain element. The switching circuit is configured to enable the gain element when the oscillator comprises a resonator and disable the gain element when the oscillator comprises a voltage controlled oscillating module.
1. An oscillator circuit comprising:
a gain element including:
a first transistor including a first gate, a first source, a first drain and a first well; and
a second transistor including a second gate, a second source, a second drain and a second well; and
a switching circuit configured to tie the first and second gates, the first and second sources, the first and second drains, and the first and second wells of the gain element such that a voltage at the first and second gates, the first and second sources, the first and second drains and the first and second wells is approximately the same to disable the gain element.
2. The oscillator circuit of claim 1 , the switching circuit configured to disable the gain element when an oscillator associated with the oscillator circuit comprises a voltage controlled oscillator module.
3. The oscillator circuit of claim 1 , the switching circuit configured to enable the gain element when an oscillator associated with the oscillator circuit comprises a resonator.
4. The oscillator circuit of claim 1 , further comprising a pad associated with a terminal of an oscillator, the switching circuit further comprising a switch coupled between the pad and an input node of the gain element, the switch configured to decouple the input node of the gain element with the pad when disabling the gain element.
5. The oscillator circuit of claim 4 , the switch further configured to couple the input node of the gain element with the pad when the oscillator comprises a resonator.