| 摘要 |
A shaper of single multi-phase group of pulses with adjustable width and pulse number in a group comprises a reversible binary counter, a circuit comprising in series connected resistor and capacitor; two synchronous D-flip-flop having asynchronous reset; first and second two-input elements AND, two elements OR, a demultiplexer. A second reversible countdown binary counter is introduced. The counter has a clock input, a summing/subtraction mode setting input, a synchronous parallel load input and a loading data input, a counting mode enable input; an asynchronous reset, an overflow output connected to a second input of second OR element and counting mode enable inputs of counters; the second input of first OR element is connected to the output of first OR element, a data input of D-flip-flop is connected to the output of first OR element; the synchronous reset of second D-flip-flop is connected to the common point of in series connected resistor and capacitor, the noninverting output of second D flip-flop is connected to the control input of demultiplexer; the inverse output of second D-flip-flop is connected to the second input of first element AND; the asynchronous reset of second counter is connected to the asynchronous reset of first counter; the clock input of second counter is connected to the clock input of first counter, the asynchronous reset of second counter is connected to the asynchronous reset of first counter; the clock input of second counter is connected to a zero level, the parallel load inputs of second counter form inputs for setting shaper to preset width of output pulses. |
