Abstract:
The invention relates to a control signal compensation method particularly intended for an analog/digital processing system provided with a control loop, including in turn a controller (5) and a monitoring (4) circuit, characterised in that it comprises the following steps:
storing the corrections made by the controller; fast processing such corrections in advance of the transmission of the corrections throughout the control loop; generating a compensating signal (014) for the latency effects of the controller, by the use of a negative feedback loop provided at the monitoring circuit level.
The invention also concerns a compensation control system implementing the above method, and an analog/digital processing system incorporating such a compensation control system.
Abstract:
A multi-phase oscillator (135) is provided. Said multi-phase oscillator includes a plurality of resonator stages (212, 211, 210) series-connected in an ordered closed loop. Each stage is used for providing one or more oscillating voltages (ck0, ck180; ck240, ck60; ck120, ck300) corresponding to an oscillating current (Itot). The oscillating current includes a natural current (Ir) that is generated by the stage and one or more injected currents (Ica, Icb) from a previous stage in the closed loop. The oscillating voltages provided by all the stages have substantially the same frequency (Fo); 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 (220, 221, 222) between each stage and the previous stage; the coupler is used for generating the injected currents according to the previous oscillating voltages. The coupler includes transconductance means (310, 320) for transforming one or more voltages corresponding to the previous oscillating voltages into one or more currents corresponding to the injected currents; the coupler further includes shifting means (610, 620) for shifting the phase of the injected currents according to the corresponding phase difference. The shifting means includes filtering means (R1, R2, C1, C2) for filtering the previous oscillating voltages into one or more corresponding filtered oscillating voltages to be supplied to the transconductance means.
Abstract:
A multi-phase oscillator (135) is provided. Said multi-phase oscillator includes a plurality of resonator stages (212, 211, 210) series-connected in an ordered closed loop. Each stage is used for providing one or more oscillating voltages (ck0, ck180; ck240, ck60; ck120, ck300) corresponding to an oscillating current (Itot). The oscillating current includes a natural current (Ir) that is generated by the stage and one or more injected currents (Ica, Icb) from a previous stage in the closed loop. The oscillating voltages provided by all the stages have substantially the same frequency (Fo); 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 (220, 221, 222) between each stage and the previous stage; the coupler is used for generating the injected currents according to the previous oscillating voltages. The coupler includes transconductance means (310, 320) for transforming one or more voltages corresponding to the previous oscillating voltages into one or more currents corresponding to the injected currents; the coupler further includes shifting means (610, 620) for shifting the phase of the injected currents according to the corresponding phase difference. The shifting means includes filtering means (R1, R2, C1, C2) for filtering the previous oscillating voltages into one or more corresponding filtered oscillating voltages to be supplied to the transconductance means.