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六、新型差—单变换方案在第四节中我们已经详细说明了两种常用的差—单变换器所存在的缺点。第五节所价绍的NMOS 集成运放方案在改用输入级作单端输出的安排下无须采用差一单变换器,因而就消除了与之相联系的种种问题;但这样做的缺点是只能利用输入级的有效增益之半,使本来就不高的运放增益受到额外的损失。针对这个缺点,文献[4]提出了另一种用于输入级的共模负反馈方案(图54),它可以全增益方式在输入
Sixth, the new type of difference - single transform scheme In the fourth section we have described in detail the shortcomings of the two common difference - single converter. The fifth part of the introduction of the price of NMOS integrated op amp program in the switch to the input stage for single-ended output arrangements do not need to use a difference between a single converter, thus eliminating the associated problems; but the disadvantage is Only half of the effective gain of the input stage can be used, so the gain of the op amp that is not high is subject to additional loss. In view of this shortcoming, literature [4] proposed another common-mode negative feedback scheme for the input stage (Figure 54), which can be fully gain-controlled at the input