In this paper we present a methodology for model-based diagnosis of analog circuits using the constraint logic programming approach. Presented methodology stems from our earlier work on the diagnosis of active analog lters by the artiicial intelligence tool CLP(<) and has the following major improvements: modeling of the diagnosed circuit is generalized to arbitrary analog circuits consisting o...

A JFET-based circuit for realizing a precision and linear floating voltage-controlled resistance (VCR) is presented for use in analog multipliers and programmable analog circuits and as a resistance mirror. It uses a matched JFET pair along with an op amp based negative feedback for realizing a precision resistance and a feedback of the source and drain voltages to the gate for realizing a line...

This paper presents a computer-aided design tool, IPRAIL, which automatically retargets existing analog layouts for technology migration and new specifications. The reuse-based methodology adopted in IPRAIL utilizes expert designer knowledge embedded in analog layouts. IPRAIL automatically extracts analog circuit and layout intellectual properties as templates, incorporates new technology desig...

In this paper, the importance and perspective for the digitally-assisted analog and RF circuits are discussed, especially related to wireless transceivers. Digital calibration techniques for compensating I/Q mismatch, IM2, and LO impairments in cellular, 2.4GHz WiFi, and 60GHz WiGig transceivers are introduced with detailed analysis and circuit implementations. Future technology directions such...

Though the importance of CAD increases, the analog circuit design is still mostly done by experience. It is known that this is because of insufficient model quality, or quality of extracted parameter values. We have developed a new MOSFET model based on the drift-diffusion approximation. By comparing a conventional piece-wise model with our precise model, critical shortage of the conventional m...

The temperature at surface of a silicon die depends on the activity of the circuits placed on it. In this paper, it is analyzed how Process, Voltage and Temperature (PVT) variations affect simultaneously some figures of merit (FoM) of some digital and analog circuits and the power dissipated by such circuits. It is shown that in some cases, a strong correlation exists between the variation of t...

Some of the earliest examples for CLP(R) were for analysing analog circuits, whose behavior can be described by Ohm’s law for the relation between resistance, voltage and current and Kirchhoff’s laws which defines how connected circuits behave. This early analysis later was extended to more complex, hybrid networks. One of the most interesting practical problems in this domain is the configurat...

High-level analog circuit design is a complex problem domain in which evolutionary search has recently produced encouraging results. However, little is known about how to best structure evolution for these tasks. The choices of circuit representation, fitness evaluation technique, and genetic operators clearly have a profound effect on the search process. In this paper, we examine fitness evalu...

---Fault diagnosis of analog circuits is essential for analog and mixed-signal circuits testing and maintenance. In this paper, a new method for multiple fault diagnosis in linear analog circuits is proposed based on the large change sensitivity analysis and ambiguity group locating technique. Test equation establishes the relationship between the measured responses and deviations of faulty par...

a1 AbstractWe describe an analog VLSI circuit that computes the time delay between an arbitrary input signal and its delayed version. Versions of this circuit will be used as the basic computational elements for human auditory localization models in both the horizontal and vertical directions. Since the circuit uses subthreshold CMOS circuitry, chip measurements show that delays ranging over fi...