Реферат: Расчет усилителя низкой частоты
Реферат
Курсовая работа оформлена на 35 страницах машинописноготекста, содержит 18 рисунков, 16 источников использованной литературы и 5 приложений.
Курсовая работа рассчитана по следующим данным:
Задача 1
Рассчитать резисторный каскадпредварительного усиления на биполярном транзисторе. Транзистор включен посхеме с общим эмиттером и должен иметь эмиттернуюстабилизацию точки покоя. Развязывающий фильтр (Cф,Rф) отсутствует. Питание цепей смещения иколлекторных цепей осуществляется от общего источника.
Uвх=0,1 В
Uн=2 В
Ri=5 кОм
Rн=3 кОм
Cн=50 пФ
fн=20 Гц
fв=2 Мгц
Мн=1,2 дБ
Мв=1,5 дБ
Необходимо выполнить следующее:
Начертить принципиальную электрическую схему каскада;
Выбрать тип транзистора;
Выбрать режим работы транзистора по постоянному току (Uок, Iок, Iоб, Uобэ);
Рассчитать номиналы резисторов R1, R2,Rк, Rэи выбрать их тип;
Рассчитать номиналы конденсаторов C1, C2,Cэ и выбрать их тип;
Определить коэффициент усиления каскада по напряжению KUна средней частоте рабочего диапазона;
Составить эквивалентные схемы каскада и рассчитать частотнуюхарактеристику каскада в диапазоне от0,1fн до 3fв, построить ее.
Задача 2
Используя данные, полученные при решении задачи 1, рассчитать частотную характеристику каскада длязаданных ниже изменений. Начертить полученную характеристику на одном графике счастотной характеристикой задачи 1 и сделать вывод о влиянии заданногоизменения на вид частотной характеристики.
Ввести в схему элемент ВЧ коррекции дросселем L=0,01 мГн, начертить принципиальную схему получившегосякаскада.
Задача 3
Зная напряжение питания усилителя, рассчитать транзисторныйстабилизированный источник напряжения компенсационного типа.
Uвых=12 В
I[C1] вых=10мА
aвых= bвых=0<span Times New Roman""><span Times New Roman"">.
1%aвх= bвх=15 %
Ключевые слова:
Усилитель, транзистор, конденсатор, резистор, частота, диод,обратная связь, напряжение, ток, емкость, сопротивление<span Times New Roman""><span Times New Roman"">,
входнаяхарактеристика, выходная характеристика, коэффициент усиления, эквивалентнаясхема, частотная характеристика, частотная коррекция, амплитудные значения.<span Times New Roman",«serif»;font-weight: normal;font-style:normal">СодержаниеВведение
1. Литературный обзор
1.1. Общиепонятия..............................................................................................5
1.2. Типыусилителей...........................................................................................5
2. Основная часть
2.1. Расчет каскада предаврительногоусиления................................................6
2<span Times New Roman""><span Times New Roman"">.
1<span Times New Roman""><span Times New Roman"">.1<span Times New Roman""><span Times New Roman"">.Принципиальная схема каскада<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.62<span Times New Roman""><span Times New Roman"">.
1<span Times New Roman""><span Times New Roman"">.2<span Times New Roman""><span Times New Roman"">.Выбор транзистора<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.62<span Times New Roman""><span Times New Roman"">.
1<span Times New Roman""><span Times New Roman"">.3<span Times New Roman""><span Times New Roman"">.Выбор режима работы транзистора по постоянному току и расчетноминалов элементов усилителя<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.
72.2. Расчет амплитудно-частотнойхарактеристики.......................................<span Times New Roman""><span Times New Roman"">.
102<span Times New Roman""><span Times New Roman"">.
3. Расчет частотной характеристики каскадас элементомВЧ коррекции<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.
.................................................................<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.142.4. Расчет стабилизированного источника напряжения
компенсационноготипа.........<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.
.........<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.152.5 Расчет выпрямителя<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.
...........<span Times New Roman""><span Times New Roman"">.........................................<span Times New Roman""><span Times New Roman"">.<span Times New Roman"">.<span Times New Roman"">.18Заключение
Литература
Приложения
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