Line driver with variable power
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorTore Andre
Life of this patent
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Abstract
A line driver supplied with a power supply voltage from a power supply uses whole or part of the power supply voltage to generate the output voltage if the input voltage is within a predefined range; loads at least one capacitor with at least one capacitor voltage; and uses whole or part of the at least one capacitor voltage in addition to whole or part of the power supply voltage to generate the output voltage if the input voltage is outside the predefined range.
Claims20
Line driver comprising:
- at least one input and at least one output, said line driver being supplied with a power supply voltage from a power supply, and being arranged to amplify an input voltage to an output voltage, where the probability that the input voltage is within a predefined range is higher then the probability that the input voltage is outside said predefined range, wherein the line driver is arranged to use whole or part of the power supply voltage to generate the output voltage if the input voltage is within the predefined range,
- wherein the line driver further includes at least one capacitor, which is arranged to be loaded with at least one capacitor voltage, and
- wherein the line driver is arranged to use whole or part of the at least one capacitor voltage in addition to whole or part of the power supply voltage to generate the output voltage if the input voltage is outside the predefined range.
Amplifying method in a line driver supplied with a power supply voltage from a power supply, in which method an input voltage is amplified to an output voltage and the probability that the input voltage is within a predefined range is higher than the probability that the input voltage is outside said predefined range, the method comprising the steps:
- using whole or part of the power supply voltage to generate the output voltage if the input voltage is within the predefined range,
- loading a capacitor with a capacitor voltage, and
- using whole or part of the capacitor voltage in addition to whole or part of the power supply voltage to generate the output voltage if the input voltage is outside the predefined range.
A balanced line driver, wherein the balanced line driver comprises first and second line drivers, the first and second line drivers each comprising:
- at least one input and at least one output, said line driver being supplied with a power supply voltage from a power supply, and being arranged to amplify an input voltage to an output voltage, where the probability that the input voltage is within a predefined range is higher then the probability that the input voltage is outside said predefined range, wherein the line driver is arranged to use whole or part of the power supply voltage to generate the output voltage if the input voltage is within the predefined range,
- wherein the line driver further includes at least one capacitor, which is arranged to be loaded with at least one capacitor voltage,
- wherein the line driver is arranged to use whole or part of the at least one capacitor voltage in addition to whole or part of the power supply voltage to generate the output voltage if the input voltage is outside the predefined range, and
- wherein the balanced line driver further comprises a phase difference block connected in series with the second line driver.
Dependencies are inferred from the claim text.