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Консультация № 187313
Обсуждение
05.05.2013, 22:08
общий
это ответ
Здравствуйте, Саша!
Это в уме легко решается.
Первый каскад - повторитель. Раз усилители идеальные, то его усиление 1 (без инверсии), бесконечное входное сопротивление (так что Rвн нас больше не интересует), и нулевое выходное (и R1 на него не влияет)
Усиление второго каскада отрицательное (он сигнал инвертирует) и равно соотношению R2/R1 то есть -2, выходное сопротивление тоже 0 (и нагрузка на выходное напряжение не влияет). Таким образом на нагрузке будет -0.4 sin [$969$]t или, если больше нравится с фазовым сдвигом, то 0.4 sin ([$969$]t + пи)
Без усилителя сигнал будет падать на внутреннем сопротивлении, так что на нагрузке останется e(t) (Rн / (Rвн + Rн)) = 0.1 sin [$969$]t - без инверсии или сдвига фазы сигнала.
Это в уме легко решается.
Первый каскад - повторитель. Раз усилители идеальные, то его усиление 1 (без инверсии), бесконечное входное сопротивление (так что Rвн нас больше не интересует), и нулевое выходное (и R1 на него не влияет)
Усиление второго каскада отрицательное (он сигнал инвертирует) и равно соотношению R2/R1 то есть -2, выходное сопротивление тоже 0 (и нагрузка на выходное напряжение не влияет). Таким образом на нагрузке будет -0.4 sin [$969$]t или, если больше нравится с фазовым сдвигом, то 0.4 sin ([$969$]t + пи)
Без усилителя сигнал будет падать на внутреннем сопротивлении, так что на нагрузке останется e(t) (Rн / (Rвн + Rн)) = 0.1 sin [$969$]t - без инверсии или сдвига фазы сигнала.
5
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