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Injection Locking of Ring Oscillators with Digitally Controlled Delay Modulation
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en
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4
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2020 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE International Symposium on Circuits and Systems proceedings
Abstract
A digital-friendly approach to implement injection-locked ring oscillators is proposed. We show that lock can be achieved by dynamically switching the delay of a delay element in a ring oscillator. A logic gate that generates the control signal for switching the delay, together with a one-bit controlled oscillator, inherently realizes a locking mechanism. Measurement results from a prototype circuit fabricated with a 28 nm CMOS process demonstrate the feasibility of the concept. The circuit with a measured lock range of 2.4-3.7 GHz occupies an area of 0.00043 mm2 and consumes 0.18 mW power.
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Unnikrishnan, V, Järvinen, O, Stadius, K, Kosunen, M & Ryynänen, J 2020, Injection Locking of Ring Oscillators with Digitally Controlled Delay Modulation. in 2020 IEEE International Symposium on Circuits and Systems (ISCAS)., 9181057, IEEE International Symposium on Circuits and Systems proceedings, IEEE, IEEE International Symposium on Circuits and Systems, Seville, Spain, 10/10/2020. https://doi.org/10.1109/ISCAS45731.2020.9181057