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US 7,071,774 B2Granted
Composite amplifier
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorRichard Hellberg
Life of this patent
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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorRichard Hellberg
Estimating the term…
A composite amplifier includes a first and a second power amplifier connected to a Chireix output network. A signal component separator and an IQ separator provide equal first and linear drive signal components that depends linearly on the amplitude A(t) of an amplitude modulated input signal. The signal component separator and IQ separator provide first and second nonlinear drive signal components that have the same magnitude but opposite signs and depend non-linearly as √1−A(t) on the amplitude A(t) and are in quadrature to the first and second linear drive signal components. Amplitude-phase adjusters individually adjust amplitudes and phases of the drive signal components to lower drive power consumption. Summers form a first composite drive signal to the first power amplifier by adding the adjusted first linear drive signal component to the adjusted first non-linear drive signal component a second composite drive signal to the second power amplifier by adding the adjusted second linear drive signal component to the adjusted second non-linear drive signal component.
A composite amplifier including a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said composite amplifier being configured to generate, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal,
A transmitter including a composite amplifier having a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said composite amplifier being configured to generate, for at least one of said power amplifiers, a low power drive signal having non-constant amplitude that depends non-linearly on the amplitude of said input signal,
A method of driving a composite amplifier including a first and a second power amplifier connected to a Chireix type output network, said composite amplifier having a modulated input signal and substantially constant voltage amplitude at the output nodes of said power amplifiers, said method comprising:
Dependencies are inferred from the claim text.