By Gloria Huertas Sánchez, Diego Vázquez García de la Vega, Adoración Rueda Rueda, Jose Luis Huertas Díaz
This publication provides the improvement and experimental validation of the structural try procedure known as Oscillation-Based try – OBT in brief. the consequences offered right here assert, not just from a theoretical viewpoint, but additionally in response to a large experimental aid, that OBT is a good defect-oriented try answer, complementing the present sensible try out suggestions for mixed-signal circuits.
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Extra info for Oscillation-Based Test in Mixed-Signal Circuits (Frontiers in Electronic Testing)
Sample text
But, obviously, one of the objectives pursued in any OBT strategy must be that the main work of the fault-detection can be achieved onchip. In fact, an intrinsic feature of the OBT concept is that the part of the fault-detection dedicated to obtain the test outputs (in this case, the oscillatory test outputs) can be made internally. It is so as long as an oscillator structure can be derived for the given BUTs and the impact of implementing it embedded in the system circuitry is minimum. In fact, the OBT strategy described in this thesis is basically intended for both, reconfiguring the BUT in the test mode and achieving the test outputs, all on-chip.
As will be seen, this issue has been ignored or at least overlooked in many references [1]-[3]. - Accuracy in estimating the reference values of the oscillation parameters. As will be seen this issue is related to both the model chosen to describe the test oscillator and the selected analysis method to study it. - High fault coverage. This issue is related to the number of the involved oscillation parameters and as will be seen it is closely linked to the features of the selected oscillator designed for test purposes.
When this sinusoidal signal passes through the amplifier, its top portion is distorted symmetrically about the peak value (indicating the presence of odd harmonics only), according to the gain characteristic displayed in Fig. 14 (which can be interpreted graphically as is shown in Fig. 16)9. 16: Non-linear gain amplifier effects Assuming v a = V ma sin ( ωt ) , and then finding the fundamental component of the resulting output, v o . we can calculate v o , which is then expanded in its Fourier series to achieve the fundamental component, v of = V mo sin ( ωt ) .