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国产电视接收机已广泛使用TA系列集成块。用于中放电路(带检波、AGC等)的是TA7611AP。它与由分立元件制作的电视机通道部分差别较大的是检波器。TA7611AP是用双差分电路作模拟乘法器来进行检波的(同步检波)。为了提高电视机的质量,利于TA系列的推广使用,本文将分析同步检波器的特点及相应的中放曲线的正确调整方法。一、TA7611AP的外围电路 TA7611AP及其外围电路如图1所示。由于TA7611AP是专为电视接收机中放而设计的宽带单片放大电路,内部并无调谐回路,所以中放部分的幅频特性和相频特性完全取决于外围电路。从TA7611AP内部等效电原理图的分析(参考有关资料。)知道,接于⑧、⑨两
Domestic TV receivers have been widely used TA series manifold. Used in the discharge circuit (with detection, AGC, etc.) is TA7611AP. It is made of discrete components of the television channel part of the difference is larger detector. The TA7611AP uses double differential circuits as analog multipliers to detect (synchronous detection). In order to improve the quality of the television, which is conducive to the promotion and use of the TA series, this paper will analyze the characteristics of the synchronous detector and the corresponding correct adjustment method of the neutral amplifier. First, TA7611AP peripheral circuits TA7611AP and its peripheral circuits shown in Figure 1. Since the TA7611AP is a wideband monolithic amplifier designed for TV receiver applications, there is no internal tuning circuit. Therefore, the amplitude-frequency characteristics and phase-frequency characteristics of the mid-amplifier are completely dependent on the peripheral circuits. From TA7611AP internal equivalent schematic analysis (refer to the information.) Know, then ⑧, ⑨ two