Digital Programmable Tracking Frequency Multiplier
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
This article describes a technique for a frequency multiplier which uses an algorithm to synthesize a higher frequency signal from a lower frequency signal. Tracking frequency multipliers are needed in many controls applications, such as robotics and electronic engine controls in automotive applications. The traditional frequency multiplier utilizes special hardware consisting of a phase-locked loop circuit with a divider counter in the feedback loop. This method is limited especially when high multiplication factors, such as 360 times, are required. In addition, it requires additional special hardware, thus increasing cost and reducing the reliability of controls systems. A digital technique is disclosed herein for generating a programmable frequency multiplier utilizing a single-chip microcomputer.