Investigation on Locking and Pulling Modes in Analog Frequency Dividers

Figure 6

Time waveforms and frequency spectra obtained by SPICE simulations of the circuit in Figure 1 for 𝐿=4nH, 𝐶=2pF, 𝑅=400Ω, and 𝐼₀=1mA. Injection amplitude and frequency determine 𝑘𝑉_in/3=0.6 and 𝑄Δ/𝜔₀=0.75. (a) Waveform obtained with initial conditions: 𝑣_𝐶(0)=0.1𝑉 and 𝑖_𝐿(0)=1mA. (b) Waveform obtained with initial conditions: 𝑣_𝐶(0)=0.1𝑉 and 𝑖_𝐿(0)=0mA. (c) Spectrum of the waveform in (a). (d) Spectrum of the waveform in (b).

(a)

(b)

(c)

(d)