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You searched for +publisher:"Texas A&M University" +contributor:("Wright, Steven.M"). One record found.

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1. Ramachandran, Arun. Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters.

Degree: 2006, Texas A&M University

A general framework for performance optimization of continuous-time OTA-C (Operational Transconductance Amplifier-Capacitor) filters is proposed. Efficient procedures for evaluating nonlinear distortion and noise valid for any filter of arbitrary order are developed based on the matrix description of a general OTA-C filter model . Since these procedures use OTA macromodels, they can be used to obtain the results significantly faster than transistor-level simulation. In the case of transient analysis, the speed-up may be as much as three orders of magnitude without almost no loss of accuracy. This makes it possible to carry out direct numerical optimization of OTA-C filters with respect to important characteristics such as noise performance, THD, IM3, DR or SNR. On the other hand, the general OTA-C filter model allows us to apply matrix transforms that manipulate (rescale) filter element values and/or change topology without changing its transfer function. The above features are a basis to build automated optimization procedures for OTA-C filters. In particular, a systematic optimization procedure using equivalence transformations is proposed. The research also proposes suitable software implementations of the optimization process. The first part of the research proposes a general performance optimization procedure and to verify the process two application type examples are mentioned. An application example of the proposed approach to optimal block sequencing and gain distribution of 8th order cascade Butterworth filter (for two variants of OTA topologies) is given. Secondly the modeling tool is used to select the best suitable topology for a 5th order Bessel Low Pass Filter. Theoretical results are verified by comparing to transistor-level simulation withCADENCE. For the purpose of verification, the filters have also been fabricated in standard 0.5mm CMOS process. The second part of the research proposes a new linearization technique to improve the linearity of an OTA using an Active Error Feedforward technique. Most present day applications require very high linear circuits combined with low noise and low power consumption. An OTA based biquad filter has also been fabricated in 0.35mm CMOS process. The measurement results for the filter and the stand alone OTA have been discussed. The research focuses on these issues. Advisors/Committee Members: Sinencio, Edgar S (advisor), Cote, Gerard.L (committee member), Martinez, Jose Silva (committee member), Wright, Steven.M (committee member), Zourntos, Takis (committee member).

Subjects/Keywords: Nonlinearity; Noise; OTA; Filters

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APA (6th Edition):

Ramachandran, A. (2006). Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ramachandran, Arun. “Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters.” 2006. Thesis, Texas A&M University. Accessed April 05, 2020. http://hdl.handle.net/1969.1/3925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ramachandran, Arun. “Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters.” 2006. Web. 05 Apr 2020.

Vancouver:

Ramachandran A. Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters. [Internet] [Thesis]. Texas A&M University; 2006. [cited 2020 Apr 05]. Available from: http://hdl.handle.net/1969.1/3925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ramachandran A. Nonlinearity and noise modeling of operational transconductance amplifiers for continuous time analog filters. [Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.