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US 7,482,869 B2Granted
High efficiency amplification
AssigneeNujira Limited
InventorMartin Paul Wilson
Life of this patent
Estimating the term…
Abstract
A radio frequency amplification stage including an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, including a circuit for providing a reference signal representing the envelope of the input signal; a circuit for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and a circuit for generating an adjusted selected power supply voltage, including an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
Claims43
A power supply stage, comprising:
- a. reference means for providing a reference signal representing a desired power supply voltage;
- b. selection means for selecting one of a plurality of power supply voltages in dependence on the reference signal, the selection means being adapted for selecting a power supply voltage above and below the reference signal, in dependence on the value of the reference signal;
- c. adjusting means adapted to generate an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
A radio frequency amplification stage comprising:
- a. an amplifier for receiving an input signal to be amplified and a power supply voltage;
- and
- b. a power supply voltage stage for supplying said power supply voltage, comprising:
- i. means for providing a reference signal representing a desired power supply voltage corresponding to the envelope of the input signal;
- ii. means for selecting one of a plurality of supply voltage levels in dependence on the reference signal, the means for selecting being adapted for selecting the supply voltage level above and below the reference signal;
- and
- iii. means for generating an adjusted selected power supply voltage, comprising an AC amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
4 more elements
A method of controlling a power supply stage, comprising:
- a. providing a reference signal representing a desired power supply voltage;
- b. selecting one of a plurality of power supply voltages in dependence on the reference signal, the selecting step being adapted for selecting a power supply voltage above and below the reference signal, in dependence on the value of the reference signal;
- c. generating an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
A power supply stage, comprising:
- a. an envelope detector for providing a reference signal representing a desired power supply voltage;
- b. a supply voltage selection block for selecting one of a plurality of power supply voltages in dependence on the reference signal, the supply voltage selection block being adapted for selecting a power supply voltage above and below the reference signal in dependence on the value of the reference signal;
- c. a supply voltage adjustment block adapted to generate an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
A radio frequency amplification stage comprising:
- a. an amplifier for receiving an input signal to be amplified and a power supply voltage;
- and
- b. a power supply voltage stage for supplying said power supply voltage, comprising:
- i. an envelope detector for providing a reference signal representing a desired power supply voltage corresponding to the envelope of the input signal;
- ii. a supply voltage selection block for selecting one of a plurality of supply voltage levels in dependence on the reference signal, the supply voltage selection block being adapted for selecting a supply voltage level above and below the reference signal;
- and
- iii. a supply voltage adjustment block for generating an adjusted selected power supply voltage, comprising an AC amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
4 more elements
A power supply stage, comprising:
- reference means for providing a reference signal representing a desired power supply voltage;
- selection means for selecting one of a plurality of power supply voltages in dependence on the reference signal, the selection means being adapted for selecting a power supply voltage below the reference signal, in dependence on the value of the reference signal;
- and
- adjusting means adapted to generate an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
1 more element
A method of controlling a power supply stage, comprising:
- providing a reference signal representing a desired power supply voltage;
- selecting one of a plurality of power supply voltages in dependence on the reference signal, the selecting step being adapted for selecting a power supply voltage below the reference signal, in dependence on the value of the reference signal;
- and
- generating an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
1 more element
A power supply stage, comprising:
- an envelope detector for providing a reference signal representing a desired power supply voltage;
- a supply voltage selection block for selecting one of a plurality of power supply voltages in dependence on the reference signal, the supply voltage selection block being adapted for selecting a power supply voltage below the reference signal in dependence on the value of the reference signal;
- and
- a supply voltage adjustment block adapted to generate an adjusted selected power supply voltage tracking the reference signal in dependence on the selected power supply voltage and the reference signal.
1 more element
Dependencies are inferred from the claim text.