The performance of an electrically programmable CCD transversal filter (PTF) is presented in which tap-weight multiplication is performed by a novel and compact on chip voltage controlled area variable MOS varicap.
Bhattacharyya, A. B., Shankarnarayan, L., Kapur, N., & Wallinga, H. (1981). Performance of an area variable MOS varicap weighted programmable CCD transversal filter. Electronics letters, 17(13), 467-468. https://doi.org/10.1049/el:19810326