Transient analysis of multiple tuned injection-locked amplifiers with modulated input signal

A method is presented for the dynamical investigation of reflection-type injection-locked amplifiers (ILAs) driven by modulated input signals. Its distinctive feature is to cover the large-signal analysis of high-order ILAs, allowing the use of broad-banding multiresonant structures. Small-parameter, stroboscopic, and congruence algebra techniques are combined to permit the calculation of output voltage transients directly in terms of amplitude and phase of the complex envelope, thus limiting the computational time required in CAD (computer-aided design) applications. Further, owing to the used black-box (scattering matrix) descriptions of the tank and coupling two-port, both linear and nonlinear subsystem identification can be performed in terms of measured data. As an example of the application of the method, a fourth-order ILA is analyzed, and results pertaining to binary phase-shift keyed (BPSK) modulated input signals are presented.<>