High-speed dual mode 16/17 pre-divider
A prescaler, high-speed technology, applied in the direction of pulse counters, counting chain pulse counters, electrical components, etc., can solve the problems of large delay, limiting frequency division frequency of dual-mode prescaler, etc., to reduce delay and solve speed Bottlenecks, effects of eliminating influence
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[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0014] See Figure 1 and Figure 2. The improved prescaler circuit in the prior art contains five positive-edge flip-flops, a two-input NAND gate, a two-input OR gate and a three-input OR gate, and it adopts three-input OR gate feedback control to realize 17 Frequency division, 17 frequency division when MCOUT is low level, through the state transition truth table and the timing around the pulse swallow signal shown in Figure 2, in order to make Q 2 Properly generate swallow pulse signal, Q 4 Q 3 The state only needs to change from 01 to 00, that is, the delay of the asynchronous frequency divider in the feedback process only includes Q 3 This reduces the minimum period of the input clock, thereby increasing the maximum operating frequency of the prescaler when dividing by 17. However, in the improved prescaler, the delay caused by ...
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