Company Filing History:
Years Active: 2014-2019
Title: Innovations by David Lamb
Introduction
David Lamb is an accomplished inventor based in Medford, MA (US). He has made significant contributions to the field of digital signal processing, holding a total of 3 patents. His work focuses on enhancing the efficiency and performance of digital filters, which are crucial in various electronic applications.
Latest Patents
One of David's latest patents is for Sparse Cascaded-Integrator-Comb Filters. In this innovation, a time-varying gain is added before the last integrating stage of a cascaded integrator comb (CIC) filter. This transformation optimizes the filter's impulse response into an FIR filter of arbitrary length. By making the coefficients sparse and selecting them from a set of small integers, David's design achieves an efficient hardware implementation without compromising essential CIC filter characteristics, particularly overflow handling. The proposed sparse CIC structure can improve the worst-case stop-band attenuation by as much as 10 dB while occupying 77% of the chip area and consuming 30% less power compared to a standard 5-order CIC filter. Additionally, it reduces the overall bit growth of the filter and the amount of high-rate operations. Design examples illustrate the advantages and flexibility of this innovative structure.
Another notable patent is for Envelope-Dependent Order-Varying Filter Control. This invention involves a discrete-time filter that serves as an interpolation filter for processing oversampled input signals, such as those used in sigma-delta digital-to-analog conversion circuits. The interpolation filter control circuit can adjust the filter order in response to information indicative of an envelope signal magnitude. For instance, higher-level input signals are processed using an interpolation filter with more stringent stop-band attenuation compared to lower-level signals. This variable filter order allows for power savings compared to filters with fixed parameters.
Career Highlights
David Lamb is currently employed at Analog Devices, Inc., where he continues to innovate in the field of digital signal processing. His work has had a significant impact on the efficiency and performance of various electronic systems.
Collaborations
David collaborates with talented individuals such as Khiem Quang Nguyen and Luiz Chamon, contributing to a dynamic and innovative work environment.
Conclusion
David Lamb's contributions to digital signal processing through his patents demonstrate his commitment to innovation and efficiency in technology. His work continues to influence the development of advanced electronic systems.