Joseph Bush

Title: Joseph Bush - Innovator in Analog-to-Digital Conversion

Introduction

Joseph Bush is a notable inventor based in West Grove, Pennsylvania. He has made significant contributions to the field of electronics, particularly in the development of analog-to-digital converters. His innovative work has led to the creation of a patented technology that enhances the performance of digital signal processing.

Latest Patents

Joseph Bush holds a patent for an Analog-to-Digital Converter (A/D converter). This invention consists of several continuously integrating charge balancing (CB) conversion stages. During each conversion interval, all CB capacitors are discharged by a reference current. In each stage, the end of the discharge of the CB capacitor is detected by a zero crossing detector. Time intervals between the zero crossing events and corresponding discharge termination events represent time equivalents of quantization errors. Each stage, other than the first, converts the time equivalents of quantization errors of the previous stage. The output of the entire multistage A/D converter is combined from the outputs of all stages in a way that provides compensation for a quantization error of any stage by the output of the next stage. The quantization noise of the entire A/D converter becomes the same as the N-time differenced quantization noise of the last stage. The differencing shapes the spectral density of quantization noise in such a way that the largest portion of the noise energy becomes shifted outside of the signal bandwidth. The larger the number of stages, the smaller the in-band portion of the quantization noise. The out-of-band portion of quantization noise can be filtered out in the post-conversion digital signal processing.

Career Highlights

Joseph Bush is currently associated with Hewlett-Packard Company, where he continues to innovate and contribute to advancements in technology. His work has been instrumental in improving the efficiency and accuracy of analog-to-digital conversion processes.

Collaborations

Throughout his career, Joseph has collaborated with esteemed colleagues such as Leonid M Blumberg and Robert P Rhodes. These collaborations have further enriched his work and contributed to the development of cutting-edge technologies.

Conclusion

Joseph Bush is a distinguished inventor whose contributions to analog-to-digital conversion have had a lasting impact on the field of electronics. His innovative patent demonstrates a deep understanding of signal processing and continues to influence advancements in technology.