Abstract
This study describes a simple method for creating extremely power efficient class AB-AB Miller op-amps. The op-amp is designed with cascoded current mirror loads and it provides high open loop gain, band width and high phase margin which improves the stability of op-amp with only a modest increase in power dissipation. These improved parameters are achieved by using a LCMFB (local common mode feedback resistor) in the input stage, which also provides class AB operation. The suggested technique is validated in LTspice with all ac, dc and transient analysis and this stufy have applications in wireless sensors and bio-medical equipment with experimental findings of 109-dB open loop gain, 62-degree phase margin, 44-KHz bandwidth with 50- μ w power consumptions.
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