Abstract

The type of acoustic charge transport (ACT) device which has generated the most widespread interest among electronics system designers is the digitally programmable transversal filter (DPTF). A heterojunction ACT (HACT) DPTF, having 128 taps with 5-b tap resolution and on-chip buffer amplifiers for input and output, is described. The device is being fabricated by a combination of epitaxial and ion-implantation processes, and it employs three metal layers. In addition to providing very high resolution for fine-line lithography and large depth of field for the nonplanar circuits in a HACT DPTF, E-beam lithography allows easy adjustment of critical circuit elements to adjust for parasitics, without the need to generate new mask layers. A discussion of the expected performance of this device is presented. >

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