RANCANG BANGUN ANALOG LOW PASS FILTER AKTIF PENDEKATAN BUTTERWORTH TOPOLOGI SALLEN-KEY ORDE 3
Sumarna Sumarna, Universitas Negeri Yogyakarta, Indonesia
Risa Nurulaliyah Sujono, Universitas Negeri Yogyakarta, Indonesia
Abstract
Penelitian ini bertujuan untuk merancang dan menganalisis filter low-pass analog aktif orde tiga dengan pendekatan Butterworth dan topologi Sallen-Key. Filter ini berfungsi menyaring sinyal frekuensi tinggi yang tidak diinginkan, dengan karakteristik respon frekuensi yang datar di passband dan penurunan tajam setelah frekuensi cutoff. Rangkaian dirancang melalui simulasi di Proteus dan dianalisis lebih lanjut menggunakan MATLAB, lalu direalisasikan secara fisik di Laboratorium Elektronika dan Instrumentasi FMIPA UNY. Proses pengujian mencakup analisis amplitudo keluaran, perbedaan fasa antara sinyal masukan dan keluaran, serta respons terhadap sinyal kotak. Hasil menunjukkan bahwa filter berhasil menurunkan amplitudo sinyal pada frekuensi tinggi dan menghasilkan respon fasa yang sesuai teori. Selain itu, ketika diberi sinyal kotak, rangkaian menunjukkan karakteristik low-pass yang stabil. Penelitian ini mendemonstrasikan bahwa rancangan Butterworth orde tiga dengan topologi Sallen-Key dapat diimplementasikan secara efektif sebagai sistem penyaringan sinyal analog frekuensi rendah.
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DOI: https://doi.org/10.21831/jifta.v12i2.24558
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