Abstract: An “all-digital” operational amplifier architecture, that does not have the constraint of maintaining devices in their saturation region, can leverage the high speed achievable by deeply scaled technology to replace traditional linear current referenced continuous-time operational amplifier circuits with CMOS-like dynamic circuits that require no referencing structure, have no static power consumption, and are compatible with ultra-low supply voltages. Techniques are described to replace analog continuous-time linear operational amplifier input and output stages by a discrete-time comparator circuit, e.g., CMOS-style, and a switched capacitor charge pump circuit, respectively.

Abstract: Systems, methods, and other embodiments associated with a continuous-time analog delay device are described. According to one embodiment, a device includes a first terminal connected to an input line to receive an input signal. The device includes a first differential pair of transistors comprising a first transistor and a second transistor, wherein a gate of the second transistor is connected to the first terminal. The device includes a second differential pair of transistors comprising a third transistor and a fourth transistor, wherein a gate of the third transistor is connected to the first terminal. The device includes a first load connected to a drain of the third transistor. The device includes a second load connected to a drain of the fourth transistor. The device includes at least one capacitor connected in parallel between the first load and the second load.

Abstract: A system for detecting a Zero Crossing point is provided. The system includes: a coupling unit connected between a high voltage side and a low voltage side of the system; and a zero crossing detector connected to the high voltage side and configured to divide a filtered mains voltage signal and to generate an output signal that indicates a zero crossing point of the filtered mains voltage signal.

Abstract: A system for detecting a Zero Crossing point is provided. The system includes: a coupling unit connected between a high voltage side and a low voltage side of the system; and a zero crossing detector connected to the high voltage side and configured to divide a filtered mains voltage signal and to generate an output signal that indicates a zero crossing point of the filtered mains voltage signal.

Abstract: A multi-phase oscillator is provided. Said multi-phase oscillator includes a plurality of resonator stages series-connected in an ordered closed loop. Each stage is used for providing one or more oscillating voltages corresponding to an oscillating current. The oscillating current includes a natural current that is generated by the stage and one or more injected currents from a previous stage in the closed loop. The oscillating voltages provided by all the stages have substantially the same frequency; on the other hand, the oscillating voltages provided by each stage and the previous oscillating voltages provided by the previous stage have a corresponding phase difference. The oscillator further includes a coupler between each stage and the previous stage; the coupler is used for generating the injected currents according to the previous oscillating voltages.

Abstract: A frequency divider circuit for obtaining, from a plurality of first signals having a first frequency and being out-of-phase to each other, at least one second signal having a second frequency equal to a fraction of the first frequency. The frequency divider circuit includes a delaying block for each first signal, the delaying blocks being series-connected in a closed loop and having a signal input, a signal output connected to the signal input of a next delaying block in the closed loop, and a clock input for receiving the corresponding first signal. Each second signal is taken from the signal output of a corresponding delaying block.

Abstract: A multi-phase oscillator is provided. Said multi-phase oscillator includes a plurality of resonator stages series-connected in an ordered closed loop. Each stage is used for providing one or more oscillating voltages corresponding to an oscillating current. The oscillating current includes a natural current that is generated by the stage and one or more injected currents from a previous stage in the closed loop. The oscillating voltages provided by all the stages have substantially the same frequency; on the other hand, the oscillating voltages provided by each stage and the previous oscillating voltages provided by the previous stage have a corresponding phase difference. The oscillator further includes a coupler between each stage and the previous stage; the coupler is used for generating the injected currents according to the previous oscillating voltages.