Two emitter-coupled multivibrators are coupled to produce a quadrature current-/voltage controlled oscillator with wide frequency tuning range (which can be wider than one decade). The tuning range, the achievable frequency of oscillation, and the synchronization transients are investigated by simulation. The influence of mismatches of timing capacitors and charging currents on synchronization is also investigated. The results of simulations for different couplings show that one can find a design with low quadrature error, low phase noise and wide tuning range. This confirms the potential of the proposed VCO for RJF applications.
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