Bias Voltage Circuit With Current Mirroring for PA Linearity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing amplifier circuits face a trade-off between power consumption and linearity, and there is a need for a stable bias voltage and precise DC current to achieve balanced performance in power amplifier circuits.
Innovation Solution
A bias voltage generating circuit comprising three subunits that generate and mirror currents and voltages to provide stable bias voltages to a power amplifier circuit, allowing for precise control of DC currents and voltages to balance linearity and amplification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If non-linear amplifier circuits are used, then power amplifier efficiency is improved, but linearity deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting bias voltages (VGP, VGN) and control voltages (VC1, VC2) to modify the operating point of the amplifier circuit. This allows the circuit to operate in different regions (linear or non-linear) depending on the desired performance, thereby resolving the contradiction between efficiency and linearity through flexible parameter control
2Reliability
If linear amplifier circuits are used, then linearity is improved, but power amplifier efficiency deteriorates
Solution Approach 1:
The patent implements dynamics by using dynamic control voltages VC1 and VC2 that are generated based on the input signal characteristics. These control voltages continuously adjust the bias conditions of the amplifier, enabling the circuit to transition between linear and non-linear operating modes in real-time, thus achieving both linearity and efficiency through adaptive behavior
3Productivity
If DC current is not accurately controlled, then power consumption adjustment is limited, but performance consistency across chips deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the bias voltages are generated and adjusted based on controlled DC currents. The circuit monitors and adjusts the bias conditions to maintain accurate DC current control, which in turn ensures consistent performance across different chip implementations while allowing flexible power consumption adjustment through the controlled current parameters
Data Source
AI summary
A bias voltage generating circuit includes a first circuit subunit, a second circuit subunit, and a third circuit subunit. The first circuit subunit is arranged to generate a first bias voltage at a first node in response to a first current and a first input voltage. The second circuit subunit is coupled to the first circuit subunit, and is arranged to receive the first bias voltage and generate a second current flowing through a second node, wherein the second current is mirrored from the first current. The third circuit subunit is coupled to the second node, and is arranged to generate a second bias voltage at a third node in response to the second current and a second input voltage.