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    • 4. 发明授权
    • Analog-to-digital converter with optional low-power mode
    • 具有可选低功耗模式的模数转换器
    • US5619204A
    • 1997-04-08
    • US394709
    • 1995-02-27
    • Michael ByrneColin PriceJohn ReidySimon Smith
    • Michael ByrneColin PriceJohn ReidySimon Smith
    • H03M1/00H03M1/12
    • H03M1/002H03M1/12
    • An IC chip having an analog-to-digital converter together with control circuitry for effecting switchover between normal-power mode and low-power mode. The control circuitry includes a first D-type flip-flop with reset which receives on its "D" input a continuous high signal; on its differential clock inputs the flip-flop receives complementary logic signals derived from the "conversion start" (CONVST) signal applied to one pin of an 8-pin chip. In normal mode, the CONVST signal is a short pulse having an initial negative-going (falling) leading edge, and the flip-flop responds to that leading edge by producing a high Q output (CONVEN). This signals the A/D converter to carry out a conversion. In low-power mode, the CONVST short pulse is positive. The subsequent negative-going (falling) trailing edge of the pulse activates the flip-flop to cause its Q output to go high and turn on the A/D converter. The control circuitry includes a second D-type flip-flop (this one with set) which receives on its D input the CONVST signal. The Q output. of the second flip-flop generates a mode switchover control signal (designated SLEEPB). During low-power mode, established by the use of positive-going CONVST pulses, the low CONVEN signal at the end of conversion clocks the second flip-flop to sample CONVST on its D input, thereby causing the Q output of the second flip-flop (SLEEPB) to go low and switch the A/D converter into low-power status.
    • 具有模数转换器和控制电路的IC芯片,用于在正常功率模式和低功率模式之间进行切换。 控制电路包括具有复位的第一D型触发器,其在其“D”输入端接收连续的高信号; 在其差分时钟输入端,触发器接收从施加到8引脚芯片的一个引脚的“转换开始”(CONVST)信号导出的互补逻辑信号。 在正常模式下,CONVST信号是具有初始负向(下降)前沿的短脉冲,并且触发器通过产生高Q输出(CONVEN)来响应该前沿。 这将通知A / D转换器进行转换。 在低功耗模式下,CONVST短脉冲为正。 脉冲的后续负(下降)后沿激活触发器,使其Q输出变为高电平,并打开A / D转换器。 该控制电路包括一个第二D型触发器(这个具有一组的触发器),其在其D输入端接收CONVST信号。 Q输出。 的第二触发器产生模式切换控制信号(指定为SLEEPB)。 在通过使用正向CONVST脉冲建立的低功耗模式期间,转换结束时的低CONVEN信号使第二触发器在其D输入上对CONVST进行采样,从而导致第二触发器的Q输出, 触发器(SLEEPB)变为低电平,并将A / D转换器切换到低功耗状态。