Abstract: An amplifier comprising an input stage (IPST) having a pair of inputs (INN,INI) for receiving a differential input signal (Vin) and a pair of outputs (CQ6,CQ7) for delivering a differential intermediate signal in response to the differential input signal (Vin); an intermediate stage (INTST) for converting the differential intermediate signal to a non-differential intermediate signal, which intermediate stage (INTST) comprises a current mirror (Q5,R5,Q4,R4) having an input branch (Q5,R5) and an output branch (Q4,R4) for receiving the differential intermediate signal; an output stage (OPST) having an input coupled to the output branch (Q4,R4) and having an output for delivering an output signal (Vout) to an output (OP) of the amplifier; and means for stabilizing the amplifier. The means for stabilizing the amplifier comprises a capacitor (CM2) coupled between the output (OP) of the amplifier and the input branch (Q5,R5).

Abstract: The present invention provides an LDO that is stable for all capacitive loads. Because the LDO is stable for all capacitive loads, the ESR (equivalent series resistance) inherent in any capacitive load can no longer affect the equivalent value of the combination of the ESR and the capacitive load. Thus, the invention also effectively removes the ESR restrictions on the loads. According to the present invention, a low dropout voltage regulator is provided. The regulator comprises a switching element (e.g., a transistor) having first terminal for receiving an input signal, a second terminal for providing an output signal and a control terminal; a control circuit, operably coupled to the switching element, that is configured to control the switching element; and a compensation circuit having a first segment connected between the first and control terminals of the switching element and a second segment connected between the control and second terminals of the switching element.

Abstract: A reference circuit contains a PTAT (Proportional To Absolute Temperature) core. In the PTAT core there is a difference between the currents densities flowing through a first and second transistor. This difference results in a difference in junction voltage in the first and second transistor. The currents are adjusted by a local feedback loop in proportion to one another until the difference in junction voltage equals a voltage drop across a resistor. According to the invention the currents to both transistors are supplied by current sources, and the currents are adjusted by deviating a fraction of the supplied current from the transistors. This makes it possible to reference all control voltages for the transistors and the local feedback loop to the same supply connection, which increases the stability and power supply rejection of the circuit.