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The return ratio of a dependent source in a linear electrical circuit is the ''negative'' of the ratio of ''the current (voltage) returned to the site of the dependent source'' to ''the current (voltage) of a replacement independent source''. The terms ''loop gain'' and ''return ratio'' are often used interchangeably; however, they are necessarily equivalent only in the case of a single feedback loop system with unilateral blocks.〔 〕 ==Calculating the return ratio== The steps for calculating the return ratio of a source are as follows:〔 〕 # Set all independent sources to zero. # Select the dependent source for which the return ratio is sought. # Place an independent source of the same type (voltage or current) and polarity in parallel with the selected dependent source. # Move the dependent source to the side of the inserted source and cut the two leads joining the dependent source to the independent source. # For a voltage source the return ratio is minus the ratio of the voltage across the dependent source divided by the voltage of the independent replacement source. # For a current source, short-circuit the broken leads of the dependent source. The return ratio is minus the ratio of the resulting short-circuit current to the current of the independent replacement source. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「return ratio」の詳細全文を読む スポンサード リンク
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