Multiple mode transmitter
First Claim
Patent Images
1. A multiple mode transmitter comprising:
- a modulator for receiving one of a plurality of types of signals and for outputting an RF signal corresponding to the received signal, the received signal corresponding to a predetermined operational mode of the multiple mode transmitter; and
an RF power amplifier for receiving the RF signal and outputting an amplified signal, the amplified signal maximizing the efficiency of operation of the transmitter when the transmitter is operating in the predetermined operational mode.
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Abstract
A system and method for providing a highly efficient linear transmitter compatible with a radio capable of operating in one of several modes. In a normal mode of operation, the radio frequency power amplifier (RFPA) runs in envelope tracking mode. Accordingly, the RFPA supply voltage follows the envelope of the linear modulation. In an alternate mode of operation, the supply modulator is locked to a fixed DC voltage. A high efficiency level is maintained in both the normal mode and the alternate mode by using a single agile DC-DC converter to supply the RFPA. The converter input voltage is switched depending on the mode of operation.
102 Citations
22 Claims
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1. A multiple mode transmitter comprising:
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a modulator for receiving one of a plurality of types of signals and for outputting an RF signal corresponding to the received signal, the received signal corresponding to a predetermined operational mode of the multiple mode transmitter; and
an RF power amplifier for receiving the RF signal and outputting an amplified signal, the amplified signal maximizing the efficiency of operation of the transmitter when the transmitter is operating in the predetermined operational mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio communication system comprising:
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a linear transmitter configured to operate in one of a plurality of operating modes;
an input signal corresponding to the particular mode in which the linear transmitter is operating;
a modulator for receiving the input signal and outputting an RF signal corresponding to the mode in which the linear transmitter is operating; and
a power amplifier for receiving the RF signal and outputting an amplified signal, the amplified signal maximizing the efficiency of operation of the particular mode in which the linear transmitter is operating. - View Dependent Claims (9, 10, 11)
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12. A method for increasing efficiency of operation in a multiple mode radio, the method comprising the steps of:
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receiving a first input signal corresponding to one of a plurality of operating modes of the radio;
receiving a second input signal corresponding to the RF information signal;
amplifying the second input signal using a power amplifier, wherein the first input signal controls the compression point of the power amplifier according to the operating mode of the radio - View Dependent Claims (13, 14, 15, 16, 17)
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18. In a multiple mode transmitter comprising a signal modulator, a supply modulator, battery and power amplifier, a method for increasing efficiency comprising the steps of:
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determining whether the transmitter is in a mode of operation wherein the envelope is substantially constant; and
bypassing the supply modulator for preventing operation of the supply modulator when the transmitter is in the substantially constant envelope mode. - View Dependent Claims (19, 20, 21, 22)
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Specification