Bias Current Control Circuit for Oscillator Amplitude and Power
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Solution Overview
Problem
Oscillator circuits face challenges in adjusting voltage signal amplitude and power consumption without generating maximum amplitude, requiring a solution to control bias current effectively.
Innovation Solution
A bias-current-control circuit comprising a transconductance circuit, constant-current source, and current-mirror circuit, which detects voltage signals to generate currents in predetermined ratios, allowing for automatic power control and negative feedback to adjust voltage signal amplitude and bias current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the bias current of the oscillator circuit is increased to increase the amplitude of the voltage signal, then the amplitude is improved, but the power consumption increases
Solution Approach 1:
The patent implements an automatic power control system that uses feedback mechanisms to monitor the amplitude of the voltage signal and dynamically adjusts the bias current accordingly. The system includes detection circuits that measure the signal amplitude and control circuits that modify the bias current to maintain optimal amplitude while minimizing power consumption, resolving the contradiction between amplitude and power consumption.
Solution Approach 2:
The patent employs dynamic adjustment of the bias current based on real-time signal conditions. Instead of using a fixed bias current, the system continuously adapts the current level according to the required amplitude, allowing the oscillator to operate efficiently across varying conditions and eliminating the need to continuously increase power consumption for amplitude control.
2Use of energy by moving object
If the bias current is adjusted to control power consumption, then power consumption is reduced, but the amplitude control precision deteriorates
Solution Approach 1:
The automatic power control system incorporates precision feedback loops that continuously monitor the voltage signal amplitude and provide accurate feedback to the bias current control circuit. This feedback mechanism ensures that even at reduced power consumption levels, the amplitude control precision is maintained through real-time adjustments based on detected signal characteristics.
Solution Approach 2:
The patent replaces manual or mechanical bias current adjustment with electronic control circuits that use electrical signals for precise regulation. The system employs electronic detection and control mechanisms that offer higher precision and faster response compared to mechanical adjustment methods, maintaining amplitude control accuracy while enabling power consumption optimization.
Data Source
AI summary
A bias-current-control circuit is provided. The bias-current-control circuit includes a transconductance circuit, a constant-current source, and a current-mirror circuit. The transconductance circuit is connected to a node and detects a voltage signal to generate a first current. The constant-current source is connected to the node and generates a tail current. The current-mirror circuit includes a reference current terminal and a bias current terminal, and the reference current terminal is coupled to the node. A second current which flows through the reference current terminal is determined by a current difference between the tail current and the first current. A bias current which flows through the bias current terminal is generated based on the second current. Furthermore, the second current and the bias current are in a predetermined ratio.