LINC power transmitter
First Claim
1. A linear amplification with nonlinear components (LINC) power transmitter, comprising:
- a digital signal processing unit which controls the LINC power transmitter;
a frequency modulation unit which modulates or converts a digital signal output from the digital signal processing unit into a radio-frequency (RF) signal;
a signal amplification unit which amplifies the RF signal output from the frequency modulation unit using a gain amplifier and a power amplification module; and
a direct current/direct current (DC/DC) conversion unit which controls bias of the power amplification module,wherein the DC/DC conversion unit controls a base bias and/or a collect bias of the power amplification module, and the power amplification module operates in saturation;
wherein the frequency modulation unit comprises;
a digital/analog (D/A) converter which receives a digital signal output from the signal component separator and converts the received digital signal into an analog signal;
a low pass filter which only passes a low frequency signal among analog signals output from the D/A converter;
a quadrature modulator which quadrature-modulates a signal output from the low pass filter; and
a local oscillator which provides an oscillation signal to operate the quadrature modulator.
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Accused Products
Abstract
A linear amplification with nonlinear components (LINC) power transmitter is provided. The LINC power transmitter includes a digital signal processing unit which controls the LINC power transmitter; a frequency modulation unit which modulates or converts a digital signal output from the digital signal processing unit into a radio-frequency (RF) signal; a signal amplification unit which amplifies the RF signal output from the frequency modulation unit using a gain amplifier and a power amplification module; and a direct current/direct current (DC/DC) conversion unit which controls bias of the power amplification module. Here, the DC/DC conversion unit controls a base bias and/or a collect bias of the power amplification module, and the power amplification module operates in saturation.
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Citations
10 Claims
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1. A linear amplification with nonlinear components (LINC) power transmitter, comprising:
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a digital signal processing unit which controls the LINC power transmitter; a frequency modulation unit which modulates or converts a digital signal output from the digital signal processing unit into a radio-frequency (RF) signal; a signal amplification unit which amplifies the RF signal output from the frequency modulation unit using a gain amplifier and a power amplification module; and a direct current/direct current (DC/DC) conversion unit which controls bias of the power amplification module, wherein the DC/DC conversion unit controls a base bias and/or a collect bias of the power amplification module, and the power amplification module operates in saturation;
wherein the frequency modulation unit comprises;a digital/analog (D/A) converter which receives a digital signal output from the signal component separator and converts the received digital signal into an analog signal; a low pass filter which only passes a low frequency signal among analog signals output from the D/A converter; a quadrature modulator which quadrature-modulates a signal output from the low pass filter; and a local oscillator which provides an oscillation signal to operate the quadrature modulator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A linear amplification with nonlinear components (LINC) power transmitter, comprising:
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a digital signal processing unit which controls the LINC power transmitter; a frequency modulation unit which modulates or converts a digital signal output from the digital signal processing unit into a radio-frequency (RF) signal; a signal amplification unit which amplifies the RF signal output from the frequency modulation unit using a gain amplifier and a power amplification module; and a direct current/direct current (DC/DC) conversion unit which controls bias of the power amplification module, wherein the DC/DC conversion unit controls a base bias and/or a collect bias of the power amplification module, and the power amplification module operates in saturation;
wherein the power amplification module comprises a virtual ground for removing a predetermined error signal. - View Dependent Claims (8, 9, 10)
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Specification