公开(公告)号：US06816091B1

公开(公告)日：2004-11-09

申请号：US10742007

申请日：2003-12-18

Applicant: Colin Chong Hin Chee

Inventor： Colin Chong Hin Chee

IPC: H03M122

CPC classification number: H03M1/206 ,  G01D5/36 ,  H03M1/303

Abstract: An interpolation circuit and method for interpolating first and second out-of-phase ramp signals are disclosed. The interpolation circuit generates fractional ramp signals from the ramp signals and utilizes four multiplexers and two comparators to compare selected ones of the ramp signals. The comparator outputs are used by a finite state machine to provide a next state for the interpolator from the current state and the comparator outputs. The signals selected by the multiplexers are determined by the current state generated by the finite state machine. The finite state machine also detects a startup condition and determines the correct current state from the comparator outputs when different ramp signals are applied to the comparators. The ramp signals can be generated from out-of-phase signals from an optical comparator. The interpolation circuit generates new out-of-phase signals having a larger number of states per cycle.

Abstract translation: 公开了用于内插第一和第二异相斜坡信号的内插电路和方法。 内插电路从斜坡信号产生分数斜坡信号，并利用四个多路复用器和两个比较器来比较所选择的斜坡信号。 比较器输出由有限状态机使用以从当前状态和比较器输出提供内插器的下一个状态。 由多路复用器选择的信号由有限状态机产生的当前状态确定。 有限状态机还检测启动条件，并且当比较器施加不同的斜坡信号时，从比较器输出确定正确的当前状态。 斜波信号可以由来自光学比较器的异相信号产生。 内插电路产生每个周期具有较大数量的状态的新的异相信号。