Blog
  • How to Solve the Quality Problem in the Processing of SMT Patch

    Quality IssuesSolutions Gluing ProcessGluing wire/spillover Revise the gluing process parameters; Control the amount of gluing; Adjust the process parameters of SMT patch;Plugging of glue mouthEmpty g...

    2017/12/29 zhengxiaowei 113

  • Mod-8 Counter Using D-Type Flip-Flops

    We will need three flip-flops to give the necessary eight states from 000 (state 0) through to 111 (state 7). We begin by, as shown in Table 7.1, listing the eight possible present states of the circuit alongside the next states that must follow....

    2017/12/02 zhengxiaowei 10

  • Mod-N Synchronous Counters

    We have seen that the design of mod-2n binary up-counters is straightforward, with all T states produced, and cycled through in sequence....

    2017/12/02 zhengxiaowei 92

  • Implementation of the Steering Logic

    Since for this type of counter in general we need the input to the nth T-type used to construct the circuit to be TN=Q0 *Q2*…QN-1, = TN-1* QN-1 it is clear there are two ways in which the steering logic can be generated....

    2017/11/29 zhengxiaowei 110

  • Mod-277 Synchronous Counters

    Synchronous binary counters are arguably the simplest sequential synchronous circuits. They use the flip-flops to store the circuit's count state and (usually) have no external inputs. Thus the next state (count) is determined solely by the last state (count). We again initially take an intuitive look at mod-N counters....

    2017/11/29 zhengxiaowei 114

  • Mod-N Asynchronous Counters

    A mod-W (or divide-by-N) asynchronous counter, where N=T, will count up to (N- 1) (an output of all 1’s) before resetting to all 0*s and beginning the count sequence again....

    2017/11/28 zhengxiaowei 129

  • The Introduction of Counters

    Counters are one of the most widely used logic components in digital electronic circuits. In addition to simply counting they can be used: to measure time and frequency; increment memory addresses;...

    2017/11/28 zhengxiaowei 128

  • The Introduction of Flip-flops and Flip-Flop Based Circuits

    Flip-flops' are vital ingredients in all except purely combinational logic circuits and are therefore extremely important. The SR (Set-Reset) flip-flop was introduced in the last chapter and illustrates an important point, namely that all flip, flops are asynchronous sequential logic circuits....

    2017/11/23 zhengxiaowei 137