Coolway
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I'm currently designing a 4-stage differential pair ring oscillator and I encounter several questions: 1. When I do TRAN simulation, I have to set the Options→maxstep to 0.1ps, otherwise the circuit will not oscillate. When I do PSS simulation, it can draw f/V curve. I wonder whether my circuit is working normally. There is no start-up circuit, btw. 2. My oscillation frequency is around 700M-1.3GHz, while my KVCO is 1GHz/V. I think it is too large. Is there any good methods that can decrease KVCO of a ring oscillator? my circuit structure is shown below.
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