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This paper presents a controllable resistor,which is formed by a MOS-resistor working in the deep triangle region and an auxiliary circuit.The auxiliary circuit can generate the gate-source voltage which is proportional to the output current of an low dropout regulator for the MOS-resistor.Thus,the equivalent output resistance of the MOS-resistor is inversely proportional to the output current,which is a suitable feature for pole-zero tracking frequency compensation methods.By switching the type of the MOS-resistor and current direction through the auxiliary circuit,the controllable resistor can be suitable for different applications.Three pole-zero tracking frequency compensation methods based on a single Miller capacitor with nulling resistor,unit-gain compensation cell and pseudo-ESR (equivalent serial resistor of load capacitor) power stage have been realized by this controllable resistor.Their advantages and limitations are discussed and verified by simulation results.
This paper presents a controllable resistor, which is formed by a MOS-resistor working in the deep triangle region and an auxiliary circuit can generate the gate-source voltage which is proportional to the output current of an low dropout regulator for the MOS-resistor.Thus, the equivalent output resistance of the MOS-resistor is inversely proportional to the output current, which is a suitable feature for pole-zero tracking frequency compensation methods. By switching the type of the MOS-resistor and current direction through the auxiliary circuit, the controllable resistor can be suitable for different applications. Thhough pole-zero tracking frequency compensation methods based on a single Miller capacitor with nulling resistor, unit-gain compensation cell and pseudo-ESR (equivalent serial resistor of load capacitor) power stage have been realized by this controllable resistor. The advantages and limitations are discussed and verified by simulation results.