Emerging multi-stage amplifiers such as the four and five stages show intense demands regarding DC gain. It is evident that cascode amplifiers are losing their compatibility since they can not satisfy voltage swing requirements with recent technology. The reason behind this is the fact that recent integrated circuit technologies reduced supply voltage value considerably while threshold voltages remained constant relatively. So direct consequence is difficulties in designing vertical arrangments of MOSFETs. As a result, the tendency turns to Cascade more than Cascode. This path highlights the frequency compensation strategy since multi-stage amplifiers possess more nodes than conventional cascode amplifiers. This means that the major challenge for multi-stage amplifiers is compensation since almost any desirable DC gain value is obtainable easily. In this condition, numerous compensation methods are presented by researchers. The issue is that compensation networks become more and more complicated with lots of extra elements. For instance, I personally dealt with some multi-stage amplifiers while compensation networks were made by Miller capacitors and active gain stages. This shows that complexity is a real concern. So is there any alternative for cascode and cascade structures?
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