個(gè)裝置(核心為三極管、場(chǎng)效應(yīng)管),得到一個(gè)波形相似(不失真),但幅值卻大很多的交流大信號(hào)的輸出。實(shí)際的放大電路通常是由信號(hào)源、晶體三極管構(gòu)成的放大器及負(fù)載組成。
偏置電路,差分放大電路,中間級(jí),輸出級(jí)。
六.放大電路的反饋
正反饋和負(fù)反饋
負(fù)反饋:四組態(tài)——電壓串聯(lián),電壓并聯(lián),電流串聯(lián),電流并聯(lián)負(fù)反饋。(注意輸出電阻和輸入電阻的改變)
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