IN-PHASE SQUARE-TO-SINE WAVE CONVERTER
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-09
The conversion of a given square wave into a sinusoid of same fundamental frequency is usually, and easily, ac- complished using basic filtering techniques. However, when it is required that the resultant sinusoid have very low distor- tion and be in phase with the input square wave, basic filtering approaches prove not to be a viable solution. A finite delay in response time due to an impulse or step function, is associated with conventional filtering techniques. This response time delay results in a phase-shifted output waveform. The response time delay is also a function of the filter's rolloff. The higher the rolloff, the greater the delay from input to output will be. For a low distortion output, a sharp rolloff is required and hence, a greater delay is added to the resultant output waveform. The scenario for an example of such stringent requirements is demonstrated in its use for a multitransmitter simulcast transmission.