{"id":2740,"date":"2024-08-11T02:38:06","date_gmt":"2024-08-10T19:38:06","guid":{"rendered":"https:\/\/www.tneutron.net\/elektro\/?p=2740"},"modified":"2024-08-07T07:41:22","modified_gmt":"2024-08-07T00:41:22","slug":"penguatan-open-loop-op-amp","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/elektro\/penguatan-open-loop-op-amp\/","title":{"rendered":"Penguatan Open-Loop Op-Amp"},"content":{"rendered":"<p>Op-amp idealnya memiliki penguatan open-loop(AOL) yang tak terhingga. Namun pada prakteknya op-amp semisal LM741memiliki penguatan yang terhingga kira-kira 100.000 kali. Sebenarnya dengan penguatan yang sebesar ini, sistem penguatan op-amp menjadi tidak stabil. Input diferensial yang amat kecil saja sudah dapat membuat outputnya menjadisaturasi. Pada bab berikutnya akan dibahas bagaimana umpan balik bisa membuat sistem penguatan op-amp menjadi stabil.<\/p>\n<p><strong>A. Unity-Gain Frequency<\/strong><br \/>\nOp-Amp ideal mestinya bisa bekerja pada frekuensi\u00a0 berapa saja\u00a0 mulai dari sinyal\u00a0 dc sampai frekuensi giga Herzt. Parameter unity-gain\u00a0 frequencymenjadi penting jika\u00a0 op-amp\u00a0 digunakan untuk aplikasi dengan frekuensi tertentu. ParameterAOL biasanya\u00a0 adalah\u00a0 penguatan op-amp pada sinyal DC.<\/p>\n<p>Response penguatan\u00a0 op-amp\u00a0 menurun\u00a0 seiring dengan menaiknya frekuenci sinyal input. Op-amp\u00a0 LM741 misalnya\u00a0 memiliki\u00a0 unity-gain frequency sebesar 1MHz. Ini berarti penguatan\u00a0 op-amp\u00a0 akan menjadi 1\u00a0 kali pada frekuensi 1 MHz. Jika perlu merancangaplikasi pada\u00a0 frekeunsi tinggi,\u00a0 maka pilihlah op-amp yang memiliki unity-gain frequency lebih tinggi.<\/p>\n<p><strong>B. Op-Amp Ideal<\/strong><br \/>\nOp-Amp pada dasarnya adalah sebuah differential amplifier (penguat diferensial) yang memiliki dua masukan. Input (masukan) op-amp seperti yang telah dimaklumi ada yang dinamakan input inverting dan non-inverting. Op-amp deal memiliki open loop gain(penguatan loop terbuka) yang tak terhingga besarnya. Seperti misalnya op-amp LM741 yang sering digunakan oleh banyak praktisi elektronika, memiliki karakteristik tipikal open loop gain sebesar 10<sup>4<\/sup>~10<sup>5<\/sup>Penguatan yang sebesar ini membuat op-amp menjadi tidak stabil, dan penguatannya menjadi tidak terukur(infinite).<\/p>\n<p>Disinilah peran rangkaian negative feedback (umpanbalik negatif) diperlukan, sehingga op-amp\u00a0 dapat dirangkai menjadi aplikasi dengan nilai penguatanyang terukur(finite). Impedasi input op-amp ideal mestinya adalah tak terhingga, sehingga mestinya arus input pada tiap masukannya adalah 0.Sebagai perbandingan praktis, op-amp LM741 memiliki impedansi input Z<sub>in<\/sub> = 10<sup>6<\/sup>Ohm. Nilai impedansi ini masih relatif sangat besar sehingga arus input op-amp LM741 mestinya sangat kecil.<\/p>\n<p>Ada dua aturan penting dalam melakukan analisa rangkaian op-amp berdasarkan karakteristik op-amp ideal. Aturan ini dalam beberapa literatur dinamakan golden rule, yaitu :<br \/>\n<a href=\"https:\/\/www.tneutron.net\/elektro\/wp-content\/uploads\/sites\/2\/2017\/05\/clip_image002.jpg\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-width: 0px;\" title=\"clip_image002\" src=\"https:\/\/www.tneutron.net\/elektro\/wp-content\/uploads\/sites\/2\/2017\/05\/clip_image002_thumb.jpg\" alt=\"clip_image002\" width=\"304\" height=\"58\" border=\"0\" \/><\/a><br \/>\n<b><i>Inilah dua aturan penting op-amp ideal yang digunakan untuk menganalisa rangkaian op-amp.<\/i><\/b><\/p>\n<p><b>C. Inverting Amplifier<\/b><br \/>\nRangkaian dasar penguat inverting seperti yang ditunjukkan pada gambar 1, dimana sinyal masukannya dibuat melalui input inverting. Seperti tersirat pada namanya, pembaca tentu sudah menduga bahwa fase keluaran dari penguat inverting ini akan selalu berbalikan dengan inputnya. Pada rangkaian ini, umpan balik negatif di bangun melalui resistor R2.<br \/>\n<a href=\"https:\/\/www.tneutron.net\/elektro\/wp-content\/uploads\/sites\/2\/2017\/05\/clip_image0021.jpg\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-width: 0px;\" title=\"clip_image002[1]\" src=\"https:\/\/www.tneutron.net\/elektro\/wp-content\/uploads\/sites\/2\/2017\/05\/clip_image0021_thumb.jpg\" alt=\"clip_image002[1]\" width=\"274\" height=\"194\" border=\"0\" \/><\/a><br \/>\nGambar Penguat Inverter<\/p>\n<p>Input non-inverting pada rangkaian inidihubungkan ke ground, atauv<sub>+<\/sub> = 0. Dengan aturan 1 (lihat aturan 1), maka akan dipenuhiv<sub>&#8211;<\/sub> =v<sub>+<\/sub> = 0. Karena nilainya = 0 namun tidak terhubung langsung ke ground, input op-ampv<sub>&#8211;<\/sub>pada rangkaian ini dinamakan virtual ground. Dengan fakta ini, dapat dihitung tegangan jepit pada R1 adalahv<sub>in<\/sub>\u2013v =vin dan tegangan jepit pada reistor R2 adalahv<sub>out<\/sub> \u2013v<sub>&#8211;<\/sub> =v<sub>out <\/sub>Kemudian dengan menggunakan aturan 2, di ketahui bahwa : i<sub>in<\/sub> +i<sub>out<\/sub> = I = 0, karena menurut aturan2, arus masukan op-amp adalah 0 i<sub>in<\/sub> +i<sub>ou<\/sub>t =v<sub>in<\/sub>\/R<sub>1<\/sub> +v<sub>out<\/sub>\/R<sub>2<\/sub> =0 Selanjutnya vout\/R2 = -v<sub>in<\/sub>\/R1 atau v<sub>out<\/sub>\/v<sub>in<\/sub> = -R2\/R1<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Op-amp idealnya memiliki penguatan open-loop(AOL) yang tak terhingga. Namun pada prakteknya op-amp semisal LM741memiliki penguatan yang terhingga kira-kira 100.000 kali.<\/p>\n","protected":false},"author":1,"featured_media":2739,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[3329],"tags":[3375,3372,3379,3378,3373,3376,3371,3370,3374,3377],"class_list":["post-2740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sistem-digital","tag-aplikasi-penjumlahan-penguatan-op-amp","tag-faktor-penguatan-op-amp","tag-jenis-penguatan-op-amp","tag-menghitung-penguatan-op-amp","tag-modus-penguatan-op-amp","tag-modus-penguatan-pada-op-amp","tag-penguatan-op-amp-inverting","tag-penguatan-op-amp","tag-rumus-menghitung-penguatan-op-amp","tag-rumus-penguatan-pada-op-amp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Penguatan Open-Loop Op-Amp - TN Elektro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tneutron.net\/elektro\/penguatan-open-loop-op-amp\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Penguatan Open-Loop Op-Amp - TN Elektro\" \/>\n<meta name=\"twitter:description\" content=\"Op-amp idealnya memiliki penguatan open-loop(AOL) yang tak terhingga. 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