Noise signals generating for ECM system - has two different adjustable frequency components has common VCO, delay line and couplers

摘要

The arrangement has a common voltage controlled oscillator or VCO for both frequency components. The VCO is switched between two voltages corresp. to the frequency components using a defined clock. The VCO output is divided onto two paths, one of which contains a delay line. The signals are recombined with equal amplitudes to form a sum signal. The clock interval equals the delay. ADVANTAGE - Has low weight and is compact arrangement.