| 摘要 |
<p>An amplifier is responsive to a signal source 38 susceptible of having changing values as a function of time and comprises at least several stages 40, 122, 209 activated only to one of two different bi-level states and bi-level outputs associated with the bi-level states of the stages being summed together to derive a summed response that is a stepwise function of the source. The amplifier has a noise source 70 and means responsive to the sources 38, 70 for activating the stages so that the number of stages in one of said states is commensurate with the combination of the value of the source and a continuously varying signal that is a function of the noise source.</p> |
