Abstract: A low-power op-amp circuit (70) having boosted bandwidth comprises a DC circuit block (72) which is coupled to first (V.sub.DC +, V.sub.DC +, V.sub.AC +) and second (V.sub.DC -, V.sub.AC) input nodes and to an output node (V.sub.OUT) of an output stage (90). The DC circuit block (72) amplifies a differential signal received from the first (V.sub.DC +, V.sub.AC +) and second (V.sub.DC -, V.sub.AC) input nodes, and provides an amplified signal to the output node (V.sub.OUT). An AC circuit block (74) is coupled to the output (NODE 3) of the DC circuit block (72). The AC circuit block (74) is operable to monitor a transient change between the first (V.sub.DC +, V.sub.AC +) and the second (V.sub.DC -, V.sub.AC -) input nodes. The AC circuit block (74) is further operable to transfer charge to the output node (V.sub.OUT) in response to the transient change, thereby providing boosted bandwidth beyond that of the DC circuit block (72) alone.

Abstract: A voltage regulator (10) is provided. A first bipolar transistor (24) has an emitter connected to a first node (NODE 6) and a base connected to a second node (NODE 5). A second bipolar transistor (30) is scaled N:1 with respect to the first bipolar transistor (24), N greater than one. The second bipolar transistor (30) has an emitter, a base, and a lateral collector. The base is connected to the second node (NODE 5). A first resistor (20) is connected between the first node (NODE 6) and an output node (NODE 2). A second resistor (32) is connected between the first node (NODE 6) and the emitter of the second bipolar transistor (30), and a third resistor (22) is connected between the first node (NODE 6) and a ground node (GND). A current sensing amplifier (12, 14, 34, 38 and 40) has a first input node (NODE 7) connected to the lateral collector of the first bipolar transistor (24) and a second input node (NODE 8) connected to the lateral collector of the second bipolar transistor (30).

Abstract: An oscillator is provided for use in integrated circuits of the type that are employed in various, relatively low power, power management systems such as can be found in mobile communications systems and the like. The oscillator provides an output frequency that is highly stable over a range of conventional operational parameters. The oscillator provides a current generator that is comprised of a pair of NMOS transistors and a pair of PMOS transistors that are arranged such that the respective gates of each pair are connected to one another to establish current mirroring. The current generator is connected to a hysteresis circuit, which is operable to develop a potential difference in the circuit. The hysteresis circuit includes an NMOS transistor and a PMOS transistor that are respectively and correspondingly coupled to the current-mirroring NMOS and PMOS transistor pairs of the current generator.

Abstract: AC stabilization and temperature compensation improves phase margin and permits high temperature (significantly above 125.degree. C.) operation for an exemplary low drop-out voltage regulator with a PNP output transistor. The low drop-out voltage regulator (FIG. 1) includes a PNP output transistor (Q.sub.OUT) together with a voltage reference circuit (12), a gain circuit (14), and a current limit circuit (16). To provide AC stabilization, a small internal capacitor (C.sub.INT) of about 10 pF is coupled between the input of the gain circuit and the base of the output PNP, using Miller multiplication to substantially increase the effective capacitance of the stabilization capacitor, and introducing a zero into the gain-phase plot for the voltage regulator, substantially cancelling the pole, with a concomitant increase in phase margin. To provide temperature compensation, a dual-collector temperature compensation PNP (Q.sub.