Current Mirror Differential Amplifier With Low Static Dissipation
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Solution Overview
Problem
Existing integrated power amplifiers for wireless devices face challenges in achieving high conversion efficiency while minimizing static dissipation, particularly in battery-powered portable devices, as increasing the amplification factor leads to unacceptable increases in bias currents and static dissipation.
Innovation Solution
A differential amplifier integrated circuit with PMOS and NMOS transistors forming current mirrors, where resistive elements are used to control bias currents and enhance current gain without increasing static dissipation, by maintaining constant bias currents and reducing transconductance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the mirror factor N is increased to achieve higher current signal amplification, then the current gain is improved, but the bias currents IM3,4 and static dissipation increase which is unacceptable for battery-powered devices
Solution Approach 1:
The amplifier is divided into two independent differential stages: a first stage (M1, M2) that sets bias currents and a second stage (M3, M4) that provides current amplification. The bias currents IM1,2 of the first stage are kept independent and constant, while the second stage provides the mirror factor N amplification. This segmentation allows the bias currents to be decoupled from the amplification factor, resolving the contradiction between achieving high current gain and maintaining low static dissipation.
2Power
If the amplification factor is increased to improve signal amplification, then the output current is enhanced, but the power consumption increases which reduces conversion efficiency
Solution Approach 1:
The amplifier is divided into two independent differential stages: a first stage (M1, M2) that sets bias currents and a second stage (M3, M4) that provides current amplification. The bias currents IM1,2 of the first stage are kept independent and constant, while the second stage provides the mirror factor N amplification. This segmentation allows the bias currents to be decoupled from the amplification factor, resolving the contradiction between achieving high current gain and maintaining low static dissipation.
3Power
If the bias currents IM3,4 are increased to achieve higher amplification, then the current output is improved, but the static dissipation increases which is unacceptable for portable devices
Solution Approach 1:
The amplifier is divided into two independent differential stages: a first stage (M1, M2) that sets bias currents and a second stage (M3, M4) that provides current amplification. The bias currents IM1,2 of the first stage are kept independent and constant, while the second stage provides the mirror factor N amplification. This segmentation allows the bias currents to be decoupled from the amplification factor, resolving the contradiction between achieving high current gain and maintaining low static dissipation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves increased current gain while maintaining low static dissipation, ensuring efficient power transfer to antennas in wireless devices with improved conversion efficiency and reduced power consumption.
Implementation Method 1
The differential amplifier integrated circuit includes at least one first resistive element and at least one second resistive element to be respectively coupled between the common terminal and the second conduction terminals of the first and the second transistors
Data Source
AI summary
The disclosure relates to an electronic differential amplification device integrated on a semiconductor chip. The device may include first and second transistors having respective source terminals connected to a first potential, and drain terminals to receive a first differential current signal. The device may include third and fourth transistors having respective source terminals connected to the first potential, and drain terminals to provide a second differential current signal to a load obtained by amplifying the first signal. The third and fourth transistors may have a respective gate terminal connected to the drain terminal of the first and the second transistors, respectively, in order to form current mirrors with the latter. The device is characterized in that the first and second transistors may have the respective gate terminals electrically connected to a common terminal, and at least one first and at least one second resistive elements are connected between the common terminal and the drain terminals of the first and the second transistors, respectively.