• Publications
  • Influence
Loop gain in analog design—A new and complete approach
  • A. Ochoa
  • Mathematics, Computer Science
  • IEEE 55th International Midwest Symposium on…
  • 5 September 2012
TLDR
This article generates a direct method for producing a unique and complete loop gain function using driving point impedance and signal flow graph techniques. Expand
Translating noise signals in linear circuits
  • A. Ochoa
  • Computer Science
  • 42nd Midwest Symposium on Circuits and Systems…
  • 8 August 1999
TLDR
This paper presents a direct and systematic method for finding the complete input equivalent noise signal through the use of the Driving Point Impedance/Signal Flow Graph methodology. Expand
Driving Point Loop Gain and Return Ratio
TLDR
A development and comparison of two main approaches to finding loop gain, one focusing on a controlled source, Bode’s Return Ratio, the other keeping circuit variables foremost, the driving point impedance approach, leading to different ‘loop gain’ representations is presented. Expand
On stability in linear feedback circuits
  • A. Ochoa
  • Computer Science
  • Proceedings of 40th Midwest Symposium on Circuits…
  • 3 August 1997
TLDR
The precise relations defining system transfer and stability functions and system phase margin are developed and are derived using the analysis methodology of Driving Point Impedance/Signal Flow Graphs (DPI/SFG). Expand
Loop gain in feedback circuits: A unified theory using driving point impedance
  • A. Ochoa
  • Mathematics, Computer Science
  • IEEE 56th International Midwest Symposium on…
  • 2 December 2013
TLDR
Following a driving point impedance perspective, a unified model is developed that can be translated into the Black's block diagram to properly identify the feedback analysis parameters and definitions and the approximation inherent in the properly loaded open-loop method is shown. Expand
On loop gain in linear networks
  • I. Filanovsky, A. Ochoa
  • Mathematics, Computer Science
  • IEEE International Symposium on Circuits and…
  • 19 May 2013
The paper clarifies the difficulties occurring in definition of loop gain in linear networks. The cut-insertion theorem allows one to obtain the parameters of the feedback system resulting fromExpand
Analyzing feedback: Properly simulating the open loop
  • A. Ochoa
  • Computer Science
  • Midwest Symposium on Circuits and Systems (Cat…
  • 9 August 1998
TLDR
This paper presents a new and complete method for finding the fully loaded loop gain for a feedback system using the driving point impedance/signal flow graph methodology. Expand
DPI/SFG Generalizations and Expansions: The Road to Feedback
The dpi/sfg methodology is a systematic analysis procedure for analog electronic circuits. It provides a process that interprets or maps a circuit onto a flow graph without the use of small signalExpand
Feedback in Analog Circuits
  • A. Ochoa
  • Computer Science
  • 15 December 2015
Finding phase margin of feedback systems from closed loop AC simulations
  • A. Ochoa, Howard Tang
  • Mathematics
  • Proceedings of the 43rd IEEE Midwest Symposium on…
  • 8 August 2000
The stability of a feedback system is generally characterized with a point variable, the system phase margin. Phase Margin is a function of the system loop gain and is not always well defined. InExpand
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