关键词: 负跨导振荡器, 片上变压器, 共模瞬态抗干扰度

Abstract: In order to solve the contradiction between common-mode transient immunity (CMTI) and power consumption of negative-gm oscillators, this paper conducts in-depth research and simulation analysis of negative-g_m oscillators. When a rapid negative CMT event occurs to a negative-gm oscillator, if the displacement current flowing out of the oscillator is too large, the N-pair tube drain voltage will be clamped at a negative diode voltage drop, causing the oscillator to stop working. In order to improve the CMTI of the negative-gm oscillator and reduce the power consumption of the oscillator, a design scheme of the negative-gm oscillator with dynamic tail current regulation is proposed. The simulation results show that the negative-gm oscillator using this scheme can maintain oscillation under the influence of fast CMT noise, and ensure the effective transmission of signal or energy. When CMTI is 300 V/ns, the power consumption is 1/7 of the original, which greatly reduces the power consumption of the circuit.?

Key words: negative-gmoscillator, on-chiptransformer, commonmodetransientimmunity