Philip Ernest Greenaway

Title: The Innovations of Philip Ernest Greenaway

Introduction

Philip Ernest Greenaway is a notable inventor based in London, GB. He has made significant contributions to the field of electrical engineering, particularly in the development of advanced filter networks and active signaling equipment. With a total of 2 patents to his name, Greenaway's work showcases his expertise and innovative spirit.

Latest Patents

One of Greenaway's latest patents is focused on bandstop filters. This invention describes a filter network that exhibits a bandstop response, developed by choosing a bandstop transfer function. A fourth-order elliptic function is converted to a low pass function, which describes a passive low pass LC ladder network that includes a negative impedance element. The application of a Bruton transformation allows for the creation of an active version of this network, incorporating an ungrounded negative resistance network in a series arm and frequency-dependent negative resistances in shunt arms, all without requiring inductance coils for implementation.

Another significant patent involves active networks and signaling equipment. This invention incorporates a gyrator and features two operational amplifiers. Each operational amplifier has an inverting and a non-inverting input, with the inverting inputs of both amplifiers directly connected. The outputs of these amplifiers are resistively connected to their respective inverting inputs. An input terminal is connected to the non-inverting input of the first operational amplifier, which is resistively connected to the output of the second operational amplifier. The output of the first operational amplifier is capacitively coupled to the non-inverting input of the second operational amplifier, while the non-inverting input of the second operational amplifier is resistively connected to earth.

Career Highlights

Philip Ernest Greenaway is currently employed at The Post Office, where he continues to innovate and contribute to the field of electrical engineering. His work has garnered attention for its practical applications and technical advancements.

Collaborations

Throughout his career, Greenaway has collaborated with notable colleagues, including John Mortimer Rollett and Alan J Greaves. These partnerships have likely enriched his work and led to further innovations in his field.

Conclusion

Philip Ernest Greenaway's contributions to electrical engineering through his patents and collaborations highlight his role as a significant inventor. His innovative work continues to influence the industry and showcases the importance of creativity in technological advancement.