| 摘要 |
<p>The generator comprises a setting device for the Doppler frequency, with a control loop between it and the oscillators which compares the two oscillators' difference frequency with the value set for the Doppler frequency. The result is applied to the variable oscillator variable capacitance, so that the difference frequency becomes equal to the set, required frequency. A phase shifter/mixer is connected to the oscillators, followed by a quantisation circuit, with one output connected directly to an input of a coincidence circuit, and the other through a flip-flop to the coincidence circuit second input. A differential circuit is connected to the coincidence circuit, followed by a comparator connected to its output and to the Doppler frequency setting device.</p> |
