Power Amplifier Gain Cancellation for Wide Dynamic Range
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Solution Overview
Problem
Existing power amplifier circuits for mobile communication devices face challenges in amplifying signals over a wide range without increasing power consumption, particularly due to the need for switches that consume more power when maximum power is output, and limited adjustability of gain in low power modes.
Innovation Solution
A power amplifier circuit configuration that includes a first amplifier and a second amplifier capable of adjusting gain by signal cancellation, with a control circuit managing the operation of the second amplifier to turn it on or off based on power modes, allowing for wide-range amplification without using switches and maintaining low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is inserted to switch between high power path and low power path, then power can be amplified in a wide range, but power consumption increases when maximum power is output
Solution Approach 1:
The patent extracts the switching function from the system by eliminating the physical switch between high power and low power paths. Instead of using a switch to select between different amplifier paths, the invention uses a single power amplifier whose gain is dynamically adjusted through feedback control, thereby removing the power consumption overhead associated with switching operations while maintaining the ability to operate across a wide power range.
Solution Approach 2:
The patent changes the operating parameters of the power amplifier dynamically by adjusting its gain through feedback control. Rather than switching between discrete high power and low power paths, the system continuously adjusts the amplifier's gain parameter based on the detected output power level, enabling smooth transition across the full power range without the power consumption penalties of switching.
2Use of energy by moving object
If the gain of a single amplifier is adjusted to achieve necessary power level without using a switch, then power consumption is reduced, but it is difficult to provide a wide range of amplification
Solution Approach 1:
The patent implements a feedback control mechanism where the output power of the amplifier is detected and used to adjust the amplifier's gain dynamically. This closed-loop feedback system enables the single amplifier to adapt its gain continuously to achieve the necessary power level, providing a wide amplification range without requiring switches or multiple amplifier paths, thus maintaining low power consumption while achieving high adaptability.
Data Source
AI summary
A power amplifier circuit includes a first amplifier that amplifies an input signal and outputs an output signal; a second amplifier that, in accordance with a control signal, amplifies a signal corresponding to the input signal, generates a signal having an opposite phase to that of the output signal, and adds the signal to the output signal; and a control circuit that supplies the control signal to the second amplifier. The control circuit outputs the control signal so that during operation of the power amplifier circuit in a first power mode, a gain of the second amplifier is not less than zero and less than a predetermined level and during operation in a second power mode lower than the first power mode in output power level, a gain of the second amplifier is not less than the predetermined level and less than a gain of the first amplifier.