本文介绍了一种用于主中频放大器末级较为理想的大动态电路。它不仅具有20dB 以上较高的增益,而且具有10～50MHz 宽带特性,特别是具有线性输出电平高达3V 以上的动态范围。适合用在某些特殊要求有强抗过载能力的中放电路中。本文除论述了该电路的设计原理外,还给出了定型电路及实验结果和数据。 This article presents a large dynamic circuit that is ideal for the final stage of a main IF amplifier. It not only has a higher gain of more than 20dB, but also has 10 ~ 50MHz broadband characteristics, especially with a linear output level up to 3V above the dynamic range. Suitable for use in some special requirements of a strong anti-overload capacity in the discharge circuit. In addition to the design of the circuit discussed in this paper, but also given the final circuit and the experimental results and data.