John P Hill

Title: John P Hill: Innovator in Disk Drive Technology

Introduction

John P Hill is a notable inventor based in Broomfield, CO (US). He has made significant contributions to the field of disk drive technology, holding a total of 4 patents. His work primarily focuses on improving the performance and efficiency of positioning servo systems in magnetic disk storage devices.

Latest Patents

One of his latest patents is the "Low Offset Position Demodulator." This invention is designed for use in the positioning servo of disk drives or similar devices. The demodulator circuit multiplies or switches a servo carrier signal, which is modulated with position information, using a synchronized gate signal. The first stage of the circuit includes a differential output and a mechanism for controlling the common mode operating point with an external control voltage. Additionally, a low pass filter with a differential output is connected to the first stage, leading to a differential-to-single-ended conversion stage that provides a single position output signal. An averaging network is also included, which averages the signals from the differential lines and compares the result to a zero voltage reference signal. This comparison is used to derive the control voltage for the first stage, ensuring the balanced demodulator maintains a zero volt level.

Another significant patent is the "Constant Bandwidth Automatic Gain Control System." This system is particularly suitable for the positioning servo system of magnetic disk storage systems. It features a double balanced modulator circuit and a fixed gain video amplifier circuit. The double balanced modulator acts as a variable gain element, with its gain controlled by a voltage derived from a conventional AGC loop. The gain of the current steering stage is limited to a maximum of 0.5, ensuring stable performance.

Career Highlights

John P Hill has been associated with Storage Technology Corporation, where he has applied his expertise in developing innovative solutions for disk drive technology. His work has significantly impacted the efficiency and reliability of data storage systems.

Collaborations

Throughout his career, John has collaborated with notable colleagues, including James Joseph Touchton and David C Robbins. Their combined efforts have contributed to advancements in the field of disk drive technology.

Conclusion

John P Hill's contributions to disk drive technology through his innovative patents demonstrate his commitment to enhancing data storage systems. His work continues to influence the industry, making him a significant figure in the realm of inventions.