河南大学：《模拟电子技术基础》课程PPT教学课件（信号与系统）ch6.3 集成电路运算放大器

河南大学：《模拟电子技术基础》课程PPT教学课件（信号与系统）ch6.2 差分式放大电路

河南大学：《模拟电子技术基础》课程PPT教学课件（信号与系统）BJT电流源接法与放大电路接法比较

河南大学：《模拟电子技术基础》课程PPT教学课件（信号与系统）BJT内部载流子传输

河南大学：《模拟电子技术基础》课程PPT教学课件（信号与系统）ch5功率放大电路（自学提纲）

功率放大电路在多级放大电路中处于最后一级， 又称输出级。其主要作用是输出足够大的功率去驱动 负载，如扬声器、伺服电机、指示表头、记录器等。 功率放大电路要求：输出电压和输出电流的幅度都比 较大；效率高。因此，三极管工作在大电压、大电流 状态，管子的损耗功率大，发热严重，必须选用大功 率三极管，且要加装符合规定要求的散热装置。由于 三极管处于大信号运用状态，不能采用微变等效电路 分析法，一般采用图解分析法

The simple filters discussed so far are characterized either by a single passband and/or a single stopband There are applications where filters with multiple passbands and stopbands are required The comb filter is an example of such filters

It is nearly impossible to design a linear￾phase IIR transfer function It is always possible to design an FIR transfer function with an exact linear-phase response Consider a causal FIR transfer function H(z) of length N+1, i.e., of order N:

The output y[n] of a frequency-selective LTI discrete-time system with a frequency response exhibits some delay relative to the input x[n] caused by the nonzero phase response of the system

The dtft provides a frequency-domain representation of discrete-time signals and lti discrete-time systems Because of the convergence condition, in many cases. the dtft of a sequence may not exist as a result. it is not possible to make use of such frequency-domain characterization in these cases Copyright C 2001, S K. Mitra