Telefonaktiebolaget Lm Ericsson (publ)

Bengt Edholm

Marko Pessa

Joni Tuomas Jäntti

Masao Naruse

Cecilia Andersson

Harri Nissi

Mikko Pulkkinen

Sven Erik Mattisson

Kristoffer Ptasinski

Johan Ulf Mercke

Michael Holmström

Niclas H&aring;kansson

Joni JÄNTTI

A power control system provides multiple supply voltages that are guaranteed not to violate boundary conditions regardless of the timing of voltage change commands. A first voltage (Vin the embodiments described herein) is controlled conventionally, and a second voltage (V) is either selected or generated by adding a selected offset to the first voltage. Both the size of the offset, and the absolute value of the second voltage, are constrained at all times, by constraint values specific to the current voltage zone. The invention ensures a smooth transition between different voltage operating points, and ensures that the trajectory of change between specified operating points remains within predefined boundaries.

System and method for control of multiple voltage regulators

A power control system provides multiple supply voltages that are guaranteed not to violate boundary conditions regardless of the timing of voltage change commands. A first voltage (Vin the embodiments described herein) is controlled conventionally, and a second voltage (V) is either selected, or generated by adding a selected offset to the first voltage. Both the size of the offset, and the absolute value of the second voltage, are constrained at all times, by constraint values specific to the current voltage zone. The invention ensures a smooth transition between different voltage operating points, and ensures that the trajectory of change between specified operating points remains within predefined boundaries.

A method and ASIC for canceling crosstalk between a first stereo channel and a second stereo channel, wherein a first signal is input to a first output amplifier for the first channel, and a second signal is input to a second output amplifier for the second channel, and an output load for each output amplifier is connected between each output amplifier and a reference amplifier. In one embodiment, the first and second signals are split prior to inputting the signals to the first and second output amplifiers, and a gain-adjusted portion of each signal is added to the other signal on the inputs of the output amplifiers. In another embodiment, the first and second input signals are again split into two paths each. While a first path of each signal is inputted to each signal's respective output amplifier, the second paths of the first and second signals are adding together. The resulting sum is adjusted by a gain function, biased by a suitable DC voltage, and input to the reference amplifier.

Crosstalk cancellation using load impedence measurements

Monitoring circuit

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Lund, Sweden

Bengt Edholm