title: Analysis of circuit conditions for optimum intermodulation and gain in bipolar cascomp amplifiers with non-ideal error correction

authors: Balsom, Toby

abstract: The cascoded-compensation or ‘Cascomp’ amplifier offers excellent distortion reduction and thermal distortion rejection, but has not seen widespread use because of a limited gain and increased complexity compared with other topologies. The original theory showed that with the addition of an ideal error amplifier the circuit will completely compensate distortion for suitably chosen degeneration and bias values. This research presents a new, rigorous mathematical proof for conditions of compensation. The authors further develop the proof to include the non-idealities of the error amplifier. It is shown that there exists a second bias point, not exposed by the original analysis that offers improved gain while maintaining distortion cancellation. By reducing the error amplifier degeneration resistance, one can increase a Cascomp circuit's overall gain by several dB while maintaining theoretically perfect distortion compensation. A robust bias point is proposed, which takes the advantage of this new theory by optimising circuit values resulting in a comparatively broader and deeper third-order distortion null. The proposed theory is confirmed with simulation and measurement that show agreement within the bounds of process and component error limits.

text: Analysis of circuit conditions for optimum intermodulation and gain in bipolar cascomp amplifiers with non-ideal error correction The cascoded-compensation or ‘Cascomp’ amplifier offers excellent distortion reduction and thermal distortion rejection, but has not seen widespread use because of a limited gain and increased complexity compared with other topologies. The original theory showed that with the addition of an ideal error amplifier the circuit will completely compensate distortion for suitably chosen degeneration and bias values. This research presents a new, rigorous mathematical proof for conditions of compensation. The authors further develop the proof to include the non-idealities of the error amplifier. It is shown that there exists a second bias point, not exposed by the original analysis that offers improved gain while maintaining distortion cancellation. By reducing the error amplifier degeneration resistance, one can increase a Cascomp circuit's overall gain by several dB while maintaining theoretically perfect distortion compensation. A robust bias point is proposed, which takes the advantage of this new theory by optimising circuit values resulting in a comparatively broader and deeper third-order distortion null. The proposed theory is confirmed with simulation and measurement that show agreement within the bounds of process and component error limits.

year: 2014-11-20

title: Operationalization of genre as a categorizer of academic and professional texts: A review of construct validity in six landmark studies

authors: Bruce, Ian

subjects: Operational definitions

abstract: This study reviews the application of genre theory to the classification of texts in six landmark studies, specifically in relation to the issue of construct validity. The genre theories that the studies draw upon include: North American New Rhetoric (more recently termed Rhetorical Genre Studies), genre theory influenced by Systemic Functional Linguistics and the English for Specific Purposes approach. The operationalization of genre in each study is examined using a framework of knowledge categories drawn from the dual social genre/cognitive genre model of the author (Bruce, 2005, 2008b). The findings indicate that the central genre-identifying element in the reviewed studies is some form of schematic or move structure to account for the staging of content within texts. While some studies associate the schematic structure with contextual, socially-constructed knowledge, others attempt to relate its stages to what are seen as genre-characterizing, linguistic features. However, what appears to be lacking in the three theories is a comprehensive, integrated approach to account for the socially constructed, general rhetorical and linguistic elements of genre knowledge. The findings of this study emphasize the developing nature of genre theory and research, and appear to support the need for a multi-faceted approach to genre in order to operationalize adequately so complex a phenomenon.

text: Operationalization of genre as a categorizer of academic and professional texts: A review of construct validity in six landmark studies This study reviews the application of genre theory to the classification of texts in six landmark studies, specifically in relation to the issue of construct validity. The genre theories that the studies draw upon include: North American New Rhetoric (more recently termed Rhetorical Genre Studies), genre theory influenced by Systemic Functional Linguistics and the English for Specific Purposes approach. The operationalization of genre in each study is examined using a framework of knowledge categories drawn from the dual social genre/cognitive genre model of the author (Bruce, 2005, 2008b). The findings indicate that the central genre-identifying element in the reviewed studies is some form of schematic or move structure to account for the staging of content within texts. While some studies associate the schematic structure with contextual, socially-constructed knowledge, others attempt to relate its stages to what are seen as genre-characterizing, linguistic features. However, what appears to be lacking in the three theories is a comprehensive, integrated approach to account for the socially constructed, general rhetorical and linguistic elements of genre knowledge. The findings of this study emphasize the developing nature of genre theory and research, and appear to support the need for a multi-faceted approach to genre in order to operationalize adequately so complex a phenomenon.

year: 2011

title: Tū Māori Ake: Seeking which is above.

authors: Maxwell, Te Kahautu

abstract: Te Waka Āwhina 2015 Seeking that which is above Kaupapa - Philosophy o Aotearoa “Tū Māori ake” E ngā mana, e ngā reo, e ngā karangatanga, nei rā te powhiri ki a koutou katoa ‘MĀ TE MĀORI, MŌ TE MĀORI’ Te Waka Āwhina o Aotearoa National Training Hui by Māori for Māori within local government Āwhea: 2 – 4 February 2015 Ki whea: The Gallagher Academy of Performing Arts, The University of Waikato, Hamilton Hau kāinga: Te Puku o te Ika.

text: Tū Māori Ake: Seeking which is above. Te Waka Āwhina 2015 Seeking that which is above Kaupapa - Philosophy o Aotearoa “Tū Māori ake” E ngā mana, e ngā reo, e ngā karangatanga, nei rā te powhiri ki a koutou katoa ‘MĀ TE MĀORI, MŌ TE MĀORI’ Te Waka Āwhina o Aotearoa National Training Hui by Māori for Māori within local government Āwhea: 2 – 4 February 2015 Ki whea: The Gallagher Academy of Performing Arts, The University of Waikato, Hamilton Hau kāinga: Te Puku o te Ika.

year: 2015-02-03