materi - 15.3 Pengaruh Balikan Terhadap Cacat...

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15.3 Pengaruh Balikan Terhadap Cacat Isyarat (Distortion) Secara ideal, keluaran v o dari sebuah penguat adalah merupakan fungsi linier dari masukan v i seperti diperlihatkan pada gambar 15.3-a, dalam bentuk v o =a o +a 1 v 1 Namun pada prakteknya, linieritas tersebut tidak sempurna; untuk penguat transistor tunggal, akan berupa fungsi eksponensial. Kita memerlukan lebih banyak suku dari deret Taylor (seperti terlihat pada gambar 15.3-b), v o =a o +a 1 v i +a 2 v i 2 Gambar 15.3 a)Keadaan ideal b)Keadaan riil Jika masukan berupa frekuensi tunggal Dengan persamaan v o pada keadaan riil dapat diselesaikan dengan memasukkan persamaan diatas yang secara praktis berupa penyelesaian persamaan trigonometeri yang akan menghasilkan keluaran dengan frekuensi baru (frekuensi harmonik) misalnya Frekuensi baru tersebut menyebabkan terjadinyaa distorsi (cacat) pada keluaran.
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Dengan penguat balikan negatif,
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  • Spring '17
  • riswal

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