论文部分内容阅读
2.高制发射电路图5是 TL6706无绳电话机的调制发射电路,它由 D1、T8、X1、V6等组成。V5、T7等组成倍频激励电路.V4、T6等组成功放电路。在普通无绳话机中,多采用变容二极管直接作调频电路。这种电路结构简单,容易得到较大的频偏,由于频偏适中时几乎无非线性失真,因而广泛采用。图5就是这种直接调频电路。图中,输入调制的音频信号经 IC8(CD4069)缓冲放大,R36、C49、C48等组成的 RC 滤波器进行预加重和手机接收电路的去加重,以提高活
2. High-level transmitter circuit Figure 5 is TL6706 cordless phone modulation transmitter circuit, which consists of D1, T8, X1, V6 and other components. V5, T7 and other components of frequency multiplier circuit. V4, T6 and other components of the successful discharge circuit. In ordinary cordless phones, more use of varactor diodes for direct frequency control circuit. This circuit structure is simple, easy to get a larger frequency offset, due to almost mid-frequency non-linear distortion, which is widely used. Figure 5 is this direct FM circuit. In the picture, the input modulated audio signal is amplified by buffer of IC8 (CD4069), pre-emphasized by RC filter composed of R36, C49, C48 and so on, and the cellphone receiving circuit is deepened to increase the live