Linear power amplifier
First Claim
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1. A power amplifier stage for operating in a Cartesian feedback loop, the power amplifier stage comprising:
- a linear radio frequency (RF) power amplifier, having an input signal from a Cartesian feedback forward path AC coupled at a first port, for amplifying the input signal and producing an output signal corresponding thereto AC coupled to a second port, the first port receiving a DC amplifier bias potential for controlling the power gain of the RF amplifier stage and the second port for receiving a power supply;
a bias control for switchably providing the DC amplifier bias potential at the first port; and
a supply control for switchably providing the power supply in response to the bias control at the second port, wherein the supply control includes a fuse sensor for disabling the second port in response to sensing a blown fuse coupled to the power supply.
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Abstract
A power amplifier stage includes a linear radio frequency (RF) power amplifier (106), having a bias port and a supply port. The bias port receives a DC amplifier bias potential (142) for controlling the power gain of the RF amplifier stage and the supply port receives a power supply. A bias control (202) switchably provides the DC amplifier bias potential (142) at the bias port while a supply control switchably provides the power supply (210) in response (160) to the bias control (202) at the supply port.
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Citations
18 Claims
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1. A power amplifier stage for operating in a Cartesian feedback loop, the power amplifier stage comprising:
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a linear radio frequency (RF) power amplifier, having an input signal from a Cartesian feedback forward path AC coupled at a first port, for amplifying the input signal and producing an output signal corresponding thereto AC coupled to a second port, the first port receiving a DC amplifier bias potential for controlling the power gain of the RF amplifier stage and the second port for receiving a power supply; a bias control for switchably providing the DC amplifier bias potential at the first port; and a supply control for switchably providing the power supply in response to the bias control at the second port, wherein the supply control includes a fuse sensor for disabling the second port in response to sensing a blown fuse coupled to the power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power amplifier stage comprising:
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a linear radio frequency (RF) power amplifier, having a gate for switchably receiving a DC amplifier bias potential for controlling the power gain of the RF amplifier stage and a drain for switchably receiving a battery supply; a controller for generating a first control signal for defining a first activation period during a TDMA transmit time slot and a second control signal for defining a second activation period, the second activation period being longer than the first activation period to cover the TDMA transmit time slot; an AND gate for receiving the first and second control signals for providing an ANDed output signal to allow the flow of the battery supply to the drain during the TDMA transmit time slot of the first control signal; a fuse sensor for disabling the drain and overriding the AND gate output signal in response to sensing a blown fuse battery supply condition; and an operational amplifier for receiving a fixed negative bias source signal, a positive digital-to-analog gain control signal, and the second control signal for level shifting and scaling the positive digital-to-analog signal to provide a shifted negative DC amplifier bias potential to the gate during the second activation period to ensure the gate is activated before the drain. - View Dependent Claims (14, 15, 16, 17)
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18. A method of bias control for a linear radio frequency (RF) power amplifier in a TDMA communication device, the method comprising:
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generating a first control signal for defining a first activation period during a TDMA transmit time slot and generating a second control signal for defining a second activation period, the second activation period being longer than the first activation period to cover the TDMA transmit time slot; sensing whether a battery fuse connected to a battery supply is blown; allowing a battery supply flow to the drain of the RF power amplifier during the TDMA transmit time slot of the first control signal if the battery fuse is not blown; and level shifting and scaling a positive digital-to-analog signal to provide a shifted negative DC amplifier bias potential to the gate of the RF power amplifier during the second activation period to ensure the gate is activated before the drain.
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Specification