Current Mirror Bias Control Across Multiple Supply Voltages
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Solution Overview
Problem
Existing amplifier technologies face challenges in achieving accurate and efficient voltage supply independent current biasing, particularly in GaAs and GaN based technologies where pFET is not available, leading to variations in bias current due to process, temperature, and supply voltage changes.
Innovation Solution
An enhanced current mirror system comprising a current controller with a reference resistor component, a voltage adjuster, and a comparator, which adjusts the supply voltage level and controls the resistance of the reference resistor to maintain optimal bias current regardless of the supply voltage, using a combination of first and second reference resistor sub-components and transistor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference resistor is used in the current mirror, then the circuit is simple, but the bias current varies with supply voltage changes
Solution Approach 1:
The patent applies dynamics by making the reference resistor value adjustable based on supply voltage conditions. The current controller dynamically switches between different resistor sub-components (first and second reference resistor sub-components) depending on whether the supply voltage is above or below a threshold, allowing the circuit to adapt to varying supply voltages and maintain accurate bias current.
Solution Approach 2:
The patent changes the resistance parameter of the reference resistor based on supply voltage levels. By switching between different resistor sub-components with different resistance values, the system adjusts the reference current to compensate for supply voltage variations, thereby maintaining stable bias current despite changes in the supply voltage parameter.
2Adaptability or versatility
If different supply voltages are used to accommodate different electronic devices, then the amplifier is more versatile, but achieving accurate voltage supply independent current biasing becomes difficult
Solution Approach 1:
The patent achieves universality by designing a current mirror system that can operate accurately across multiple supply voltage levels (e.g., 5V, 6V, 8V, 10V). The current controller with its switching mechanism between different resistor sub-components provides a universal solution that maintains bias current accuracy regardless of which supply voltage is applied, making the amplifier compatible with various electronic devices.
Solution Approach 2:
The patent employs feedback by using a comparator to monitor the supply voltage level and generate a control signal that switches the appropriate resistor sub-component into the circuit. This feedback mechanism ensures that the reference current automatically adjusts in response to supply voltage changes, maintaining accurate bias current across different operating conditions.
Data Source
AI summary
An enhanced current mirror can be utilized to accurately control a bias current associated with an amplifier. A current controller component (CCC) can employ the enhanced current mirror and can be associated with the amplifier. The CCC can comprise a comparator that can compare an adjusted supply voltage level to a reference voltage level, the adjusted supply voltage level relating to a supply voltage level of a supply voltage supplied to the amplifier and CCC. The CCC can control switching of an operational state of a transistor of the comparator to switch in or out a resistance of a reference resistor component associated with the supply voltage, based on a result of the comparison of the adjusted supply voltage level to the reference voltage level, to facilitate accurately controlling an amount of bias current associated with the amplifier. The CCC and amplifier can be situated on the same die.