Bias Generator Current Control Circuit Linear Voltage
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Solution Overview
Problem
Existing current control circuits and bias generators face challenges in precisely controlling bias voltage or current with linear characteristics over a wide range, especially when operating devices like smartphones or sensors, and require efficient power management to minimize power consumption.
Innovation Solution
A bias generator comprising a current mirror circuit and a switch circuit that controls the direction of current flow through a variable resistor, allowing for precise adjustment of bias voltage based on reference voltage and current, with the ability to generate both high and low bias voltages while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a relatively high bias voltage or current is generated to extend operating time, then the operating time is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of bias current by switching between different current paths based on operational requirements. The circuit can adjust the bias current level dynamically, using higher current only when necessary for extended operation and lower current during normal operation, thus extending operating time while managing power consumption effectively.
2Measurement precision
If the bias voltage or current is precisely controlled for high accuracy operation, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the bias control function into separate modular components: a bias generation unit, a switching unit, and a control unit. Each module performs a specific function, making the overall system easier to design, implement, and maintain while achieving precise bias control through coordinated operation of these segmented components.
Solution Approach 2:
The patent introduces a switching circuit as an intermediary between the bias generation unit and the operational amplifier. This switching mechanism enables precise control of the bias current by selectively connecting different current paths without requiring complex direct control circuitry, thus achieving high precision with reduced overall complexity.
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 enables precise and linear control of bias voltage, widening the control range and reducing power consumption by effectively managing current flow direction through the variable resistor, enhancing the operational stability and efficiency of devices like smartphones and sensors.
Implementation Method 1
a current mirror circuit configured to generate a first current and a second current based on a reference current
Implementation Method 2
an operational amplifier including a first input connected to an output of the switch circuit, a second input that receives a reference voltage, and an output that outputs a bias voltage
Implementation Method 3
The bias voltage may be determined based on the reference voltage, and a voltage drop/rise that occurs in the variable resistor
Data Source
AI summary
A current control circuit and a bias generator including the current control circuit are provided. The bias generator may include a current mirror circuit configured to generate one of a first current and a second current based on a reference current; a switch circuit configured to transfer one of the first current and the second current to a variable resistor; an operational amplifier including a first input node connected to the switch circuit, a second input node that receives a reference voltage, and an output node that outputs a bias voltage; and the variable resistor connected between the first input node and the output node of the operational amplifier. By switching operation of the switch circuit, a direction in which the first current flows in the variable resistor may be different from a direction in which the second current flows in the variable resistor.