Providing pre-distortion to an input signal
First Claim
Patent Images
1. An apparatus comprising:
- a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal;
the gain device to receive the pre-distorted signal and to output an amplified RF signal, wherein the diode device is to pre-distort the incoming signal with a substantially inverse distortion of a non-linearity of the gain device such that the amplified RF signal is a substantially linear version of the incoming RF signal; and
a second diode device to receive the incoming RF signal and to provide a second pre-distorted signal to a second gain device, wherein the second diode device and the second gain device are connected to a supply voltage, and wherein the gain device and the second gain device form a complementary gain stage, and the diode device is coupled between a reference voltage and a gate terminal of the gain device and the second diode device is coupled between the supply voltage and a gate terminal of the second gain device.
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Abstract
In one implementation, the present invention includes a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal. Based on this pre-distorted signal, the gain device can output an amplified RF signal having substantial linearity to the incoming RF signal.
47 Citations
18 Claims
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1. An apparatus comprising:
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a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal; the gain device to receive the pre-distorted signal and to output an amplified RF signal, wherein the diode device is to pre-distort the incoming signal with a substantially inverse distortion of a non-linearity of the gain device such that the amplified RF signal is a substantially linear version of the incoming RF signal; and a second diode device to receive the incoming RF signal and to provide a second pre-distorted signal to a second gain device, wherein the second diode device and the second gain device are connected to a supply voltage, and wherein the gain device and the second gain device form a complementary gain stage, and the diode device is coupled between a reference voltage and a gate terminal of the gain device and the second diode device is coupled between the supply voltage and a gate terminal of the second gain device. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal; the gain device to receive the pre-distorted signal and to output an amplified RF signal, wherein the diode device is to pre-distort the incoming signal with a substantially inverse distortion of a non-linearity of the gain device such that the amplified RF signal is a substantially linear version of the incoming RF signal; and a helper circuit coupled to the diode device to control the pre-distorted signal at a common terminal of the diode device and the gain device, wherein the diode device comprises a transistor having a gate terminal coupled to a gate terminal of the gain device, and an output terminal coupled to an input of the helper circuit and an output of the helper circuit coupled to the gate terminals.
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7. A power amplifier comprising:
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a first driver stage to receive a radio frequency (RF) signal and provide a first RF driver signal; a second driver stage to receive the RF signal and provide a second RF driver signal; a first complementary pair of diode devices coupled to at least one of the first and second driver stages to pre-distort the first and second RF driver signals into a first pair of pre-distortion signals to compensate for non-linearity of a first gain stage; the first gain stage including a complementary amplifier to receive the first pair of pre-distortion signals and to output a first amplified RF signal; a second complementary pair of diode devices coupled to at least one of the first and second driver stages to pre-distort the first and second RF driver signals into a second pair of pre-distortion signals to compensate for non-linearity of a second gain stage; and the second gain stage including a complementary amplifier to receive the second pair of pre-distortion signals and to output a second amplified RF signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A power amplifier comprising:
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a first parallel gain stage to receive a first input current on a first input signal line and to generate a first amplified output current, the first parallel gain stage including a first pre-distortion device coupled to the first input signal line to generate a pre-distortion voltage, a first filter coupled to the first pre-distortion device and tuned to a fundamental frequency, and a first gain device driven by the pre-distortion voltage and to generate the first amplified output current; and a second parallel gain stage to receive a second input current on a second input signal line and to generate a second amplified output current, the second parallel gain stage including a second pre-distortion device coupled to the second input signal line to generate a second pre-distortion voltage, a second filter coupled to the second pre-distortion device and tuned to a harmonic of the fundamental frequency, and a second gain device driven by the second pre-distortion voltage and to generate the second amplified output current, wherein the first amplified output current and the second amplified output current are provided to a load to generate an amplified voltage, and wherein the second parallel gain stage is to reduce at least one harmonic generated in the first parallel gain stage. - View Dependent Claims (14, 15)
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16. An apparatus comprising:
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a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal, wherein the diode device is a diode-connected CMOS transistor having a common polarity with a CMOS transistor corresponding to the gain device; and the gain device to receive the pre-distorted signal and to output an amplified RF signal, wherein the diode device is to pre-distort the incoming signal with a substantially inverse distortion of a non-linearity of the gain device such that the amplified RF signal is a substantially linear version of the incoming RF signal. - View Dependent Claims (17, 18)
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Specification