自测题 一、(1)×(2)√(3)×(4)√ 二、(1)B(2)C(3)A(4)D 三、(a)电流串联负反馈

10.1概述口 10.2D/A转换器(DAC) 10.3A/D转换器(ADC)

A current i at Li produces an open circuit voltage u,at L2s dyal

1.A functionf(t) is said to be even iff(t)=(-t). They are symmetrical with respect to the vertical axis. (bn=0)

14-5 Waveform synthesis Synthesis is a combination of so as form a whole

An ideal transformer is a useful approximation of a very tightly coupled transformer in which the coefficient of coupling is almost unity and both the primary and secondary inductive reactance are extremely large in comparison with the terminating impedance

1. Nonlinear resistor A nonlinear resistor is an element whose voltage and current are related by a nonlinear equation

sinusoidal current or voltage at a given frequency is characterized by only two parameters an amplitude and a phase angle. The complex representation of the voltage or current is also characterized by these same two parameters

Let us assume a solution i(t=Ae, where a and S, are constant to be determined

(a)Find V, in Fig. 8-20.(b)To what identical value should each of the 4Q2 resistors be changed so that V2 is 180 out of phase with the source voltage?