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Supplementing Eet Analog Labs With Switched Capacitance Integrated Circuits

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2005 Annual Conference


Portland, Oregon

Publication Date

June 12, 2005

Start Date

June 12, 2005

End Date

June 15, 2005



Conference Session

Curriculum Development in Electrical ET

Page Count


Page Numbers

10.1182.1 - 10.1182.11



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Paper Authors

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William Lehman

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Asad Yousuf

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Session xxxx

Supplementing EET Analog Labs with Switched Capacitance Integrated Circuits

William Lehman, Advanced Systems & Materials Asad Yousuf, Savannah State University Muniyappa Venkatesha, Savannah Technical College Chung-Ling Huang, Southern University


Programmable Analog Integrated Circuits (IC) provides designers the capability to change analog circuits in the field. Although Programmable Switched Capacitance circuits are a technology that deserves study by itself, our main focus here is how such IC’s can be used to supplement traditional EET Analog Labs.

Three major players in programmable switched capacitance are Cypress MicroSystems, Anadigm and Lattice Semiconductors. Cypress PSoC is a micro- controller connected to an array of digital and analog switched capacitance blocks. Anadigm produces a Field Programmable Analog Array (FPAA). Anadigm FPAA requires a micro-controller or FPGA to initialize and control the device via a SPI interface. Lattice Semiconductors is a competitor to Anadigm.

Circuits for all three development environments can be designed graphically before the lab to further save time. This paper will report on the utilization of three development environment to supplement the traditional analog labs. Actual circuits examples described were implemented in hardware for Cypress PSoC and Anadigm switched capacitance IC’s. The paper will also provide a comparison table to discuss the features of the aforementioned development environments.


Using programmable switched capacitance to enhance EET Analog Labs may bring to mind using CPLD/FPGA to enhance EET Digital Labs just a few years ago. The analogy between Digital and Analog Labs is not quite valid. In reality programmable switched capacitance is actually a hybrid digital/analog design technique [12]. As a rule of thumb the clock used to drive the programmable switched capacitance blocks must be about 10 times higher than the frequency of the analog signal to be processed [1][2][3].

There is also similarities that may be found between DSP’s and programmable switched capacitance blocks. But once again the analogy between DSP’s and programmable switched capacitance blocks is also limited.

Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright © 2005, American Society for Engineering Education

Lehman, W., & Yousuf, A. (2005, June), Supplementing Eet Analog Labs With Switched Capacitance Integrated Circuits Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--15471

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