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US 10,855,234 B2Granted
Power amplifier and wireless communication device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorTong Wang
Life of this patent
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Abstract
A power amplifier includes an output signal generator constructed to generate, on the basis of an input AC signal, an output signal including, in cycles, a first pulse being width higher in voltage than a first reference voltage and a second pulse being width lower in voltage than the first reference voltage and a feedback circuit constructed to generate a first bias signal corresponding to the output signal and feed back the first bias signal to an input side of the output signal generator to equalize a width of the first pulse and a width of the second pulse in the cycles of the output signal.
Claims12
A power amplifier comprising:
- an output signal generator constructed to receive a first pulse having a first pulse width and a second pulse having a second pulse width which are formed according to the input AC signal and generate an output signal;
- a detector constructed to remove a harmonic component of the output signal and generate an average DC voltage;
- an adjuster constructed to compare the average DC voltage with a first reference voltage to generate a first bias signal such that the average DC voltage matches the first reference voltage,
- wherein the first pulse is generated by a signal which is combined the input AC signal via a first capacitor and the first bias signal via a first resistor, through a plurality of inverters;
- a switcher constructed to switch whether to feed back the first bias signal to the input side of the output signal generator;
- and
- a pre-driver constructed to stabilize an output signal of a differential amplifier in a state in which the first bias signal is not fed back to the input side of the output signal generator by the switcher,
- wherein the switcher causes the pre-driver to set the output signal of the differential amplifier to a predetermined value and thereafter feeds back the first bias signal.
5 more elements
A power amplifier comprising:
- an output signal generator constructed to receive a first pulse having a first pulse width and a second pulse having a second pulse width which are formed according to the input AC signal and generate an output signal;
- a detector constructed to remove a harmonic component of the output signal and generate an average DC voltage;
- and
- an adjuster constructed to compare the average DC voltage with a first reference voltage to generate a first bias signal;
- wherein the first pulse is generated by a signal which is combined with the input AC signal via a first capacitor and the first bias signal via a first resistor, through a plurality of inverters,
- wherein the output signal generator includes a first transistor and a second transistor having different conduction types from each other, the first transistor and the second transistor being cascode-connected between a first reference voltage node and a second reference voltage node,
- the first transistor includes a first control terminal to which a signal corresponding to the AC signal is input and a first output terminal constructed to output the first pulse at each cycle of the output signal,
- the second transistor includes a second control terminal to which a signal corresponding to the AC signal is input and a second output terminal constructed to output the second pulse at each cycle of the output signal,
- the first output terminal and the second output terminal are connected to each other, and
- the adjuster feeds back the first bias signal to a signal line connected to one of the first control terminal and the second control terminal.
7 more elements
A wireless communication device comprising a power amplifier, the power amplifier including:
- an output signal generator constructed to receive a first pulse having a first pulse width and a second pulse having a second pulse width which are formed according to the input AC signal and generate an output signal;
- a detector constructed to remove a harmonic component of the output signal and generate an average DC voltage;
- and
- an adjuster configured to compare the average DC voltage with a first reference voltage to generate a first bias signal such that the average DC voltage matches the first reference voltage,
- wherein the first pulse is generated by a signal which is combined the input AC signal via a first capacitor and the first bias signal via a first resistor, through a plurality of inverters;
- a switcher constructed to switch whether to feed back the first bias signal to the input side of the output signal generator;
- and
- a pre-driver constructed to stabilize an output signal of the differential amplifier in a state in which the first bias signal is not fed back to the input side of the output signal generator by the switcher,
- wherein the switcher causes the pre-driver to set the output signal of the differential amplifier to a predetermined value and thereafter feeds back the first bias signal.
6 more elements
Dependencies are inferred from the claim text.