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Implementing Programmable T-Networks Using Xicor Digitally Controlled Potentiometers (XDCPs)—IGSF Filters

Authored on: Oct 1, 1999

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Implementing a traditional T-network using XDCPs results in a programmable T-network, and the analog function associated with the T-network becomes programmable as well. In other words, using XDCPs puts the analog function on the bus.

Filtering is a common application of T-networks. A good example of this is a second-order, low-pass Infinite Gain Single Feedback (IGSF) filter, shown below. An IGSF filter consists of an inverting amplifier whose input, A, is a T-network, and output, B, is a bridged T-network. The factor k (the Wojslaw factor) represents the wiper position of the XDCP.

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