Amplifier Bias Control Circuit for Linearity and Dynamic Range
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Solution Overview
Problem
The linearity of amplifiers is influenced by their bias, which can vary due to process variations, making it difficult to accurately predict the actual bias of manufactured amplifiers, thereby affecting the dynamic range of signal transceivers.
Innovation Solution
An amplifier device is designed with a regulator circuit, a voltage converting circuit, and a control circuit that generate operating voltages and signals to control the amplifier circuit, improving linearity by adjusting the voltage levels and signals to optimize the amplifier's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the amplifier bias is determined by process variation, then the manufacturing cost is reduced, but the linearity prediction accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring the actual bias of the amplifier during the manufacturing process and using this measured bias value to pre-calculate and set the compensation capacitance value before the amplifier is deployed. This ensures that the linearity compensation is tailored to the specific amplifier instance, achieving accurate linearity prediction while maintaining manufacturing efficiency through automated measurement and calculation.
Solution Approach 2:
The patent changes the parameter of compensation capacitance based on the measured bias value. By adjusting the compensation capacitance value according to the actual bias (which varies due to process variation), the system optimizes the linearity of each amplifier instance. This parameter adaptation allows the system to maintain high linearity prediction accuracy despite manufacturing variations.
2Device complexity
If the compensation capacitance is fixed, then the device complexity is reduced, but the linearity compensation effectiveness deteriorates
Solution Approach 1:
The patent implements dynamics by making the compensation capacitance value adjustable rather than fixed. The compensation capacitance is dynamically set based on the measured bias value of each amplifier, allowing the system to adapt to process variations. This is achieved through a switchable capacitor array or variable capacitor structure that can be programmed with the optimal capacitance value, balancing circuit complexity with compensation effectiveness.
3Manufacturing precision
If the bias measurement and compensation setup is performed for each amplifier, then the linearity is improved, but the manufacturing time increases
Solution Approach 1:
The patent applies self-service by having each amplifier measure its own bias during manufacturing and automatically calculate and set its own compensation capacitance value. This self-calibration process eliminates the need for manual measurement and adjustment by technicians, reducing manufacturing time while maintaining high linearity precision. The process can be fully automated through integrated measurement and programming circuits.
Data Source
AI summary
An amplifier device includes a regulator circuit, a first voltage converting circuit, a first control circuit, and an amplifier circuit. The regulator circuit is configured to output a first driving voltage. The first voltage converting circuit is coupled to the regulator circuit, and is configured to output one of the first driving voltage and at least one first voltages related to the first driving voltage, as a first operating voltage. The first control circuit is coupled to the first voltage converting circuit through a first node, and is configured to receive the first operating voltage and generate a first operating signal according to the first operating voltage and a first control signal. The amplifier circuit is coupled to the first control circuit and the regulator circuit, and is configured to receive the first driving voltage, and is controlled by the first operating signal to generate an output voltage.