针对 Cascode结构振荡器进行研究，通过理论推导和分析，给出两级负阻提升的通用模型，该模型可以被广泛应用于混沌电路设计中，实际电路设计时可以用合适的负阻电路单元替代两级结构中的下级部分，实现电路负阻的提升。仿真设计结果表明，基于该模型设计的混沌电路的混沌振荡基频 f0为 4.2 GHz，f0/fT值达到 0.46，较经典单级电路有较大提升。

An optical frequency comb phase-locked on an iodine frequency stabilized diode laser at 634 nm is constructed to transfer the accuracy and stability from the optical domain to the radio frequency domain. An external-cavity diode laser is frequency-stabilized on the Doppler-free absorption signals of the hyperfine transition R(80)8-4 using the third-harmonic detection technique. The instability of the ultra-stable optical oscillator is determined to be 7\times10^{-12} by a cesium atomic clock via the optical frequency comb’s mass frequency dividing technique.