Consideration of Oscillation Conditions in Self-Excited Oscillator Circuits Related to Microwave Circuits

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last updated：Aug 21, 2015

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It can be confirmed that each spectrum is almost consistent in terms of levels.

The oscillation condition of a self-excited oscillation circuit, for example in the circuit shown in Fig. 1, can be expressed as (1) by considering the impedances on the left and right sides from the virtual cutting plane a-a', denoted as Za and Zb. This oscillation condition is satisfied at any cutting plane. However, since the parameters of the transistor asymptotically approach matching as the oscillation grows, it is difficult to confirm the establishment of this matching condition using small-signal S parameters. Therefore, we use the harmonic balance technique of self-excited oscillation to simulate the steady-state oscillation condition and verify the oscillation condition in (1). 【Features】 ○ The oscillation condition is satisfied at any cutting plane. ○ We simulate the steady-state oscillation condition using the harmonic balance technique of self-excited oscillation and confirm the oscillation condition in (1). For more details, please contact us or download the catalog.

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【Brief Lecture】 [Microwave Circuit Related] ○ Loaded Line Type Phase Shifter ○ Hybrid Coupled Type Phase Shifter ○ Design of Duplexers ○ Wideband High Isolation IC SW Circuit ○ Performance Optimization of "Wideband IC SW Circuit" and Practical Development Guidelines for Application Products ○ Consideration of Oscillation Conditions in Self-Excited Oscillator Circuits ○ Analysis of Crystal Oscillators Using HB Oscillator Analysis ○ Design Techniques for 10GHz High Stability Oscillators Using Disk-Shaped Dielectric Resonators ○ Design Methods to Improve the Reliability and Quality of Crystal Oscillators ○ Medium Band Low Power Amplifiers ○ Design Techniques for Ultra Wideband X-Band LNA ○ Various Parameter Transformations and Derivations of Amplifying Elements ○ Design Methods for Distributed Amplifiers ○ Design Methods for Broad Band Millimeter Wave LNA with Fixed Resistance Matching ○ Evaluation of FM Amplifiers Using Noise Models and Harmonic Balance ○ Spurious Removal Doubling Circuits ○ GHz Band LNA Design and Performance Evaluation ○ 20GHz Band Wideband LNA ○ Push-Pull Ultra Low Distortion Wideband Amplifier ○ Design of Helical Resonator BPF ○ Design Methods for HiQ-BPF Using Dielectric Resonators, etc. ● For more details, please contact us or download the catalog.