Detector Circuit Temperature Compensation via Current Mirror
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing envelope detector circuits face challenges in temperature compensation due to differences in temperature characteristics between diodes and thermistors, leading to inappropriate temperature compensation operations and difficulty in matching these characteristics.
Innovation Solution
A detector circuit incorporating a first rectification element, a second rectification element, and a current mirror circuit that supplies a current-mirror current to both elements, effectively canceling out temperature-dependent changes in detection voltage by mirroring the current and forward voltage of the diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermistor is used to compensate for temperature in an envelope detector circuit, then temperature compensation is achieved, but the temperature characteristics cannot be properly matched due to differences between diode and thermistor characteristics
Solution Approach 1:
The patent uses a current mirror circuit to create a copy of the diode's current characteristics. By mirroring the current through the diode to another diode in the detection path, the circuit replicates the temperature-dependent current behavior, allowing for accurate temperature compensation without relying on thermistor-diode characteristic matching
Solution Approach 2:
The patent changes the approach from using a separate temperature compensation component (thermistor) to using the diode's own current characteristics as the compensation mechanism. By utilizing the diode's inherent temperature-dependent current-voltage relationship and mirroring it, the system achieves temperature compensation through parameter transformation rather than component substitution
2Adaptability or versatility
If different types of elements (diode and thermistor) are used in the circuit, then temperature compensation is attempted, but it becomes difficult to match the temperature characteristics between elements
Solution Approach 1:
The patent employs homogeneous elements (diodes) throughout the detection and compensation paths, eliminating the heterogeneity between diodes and thermistors. By using identical diode components in both the signal detection path and the compensation path, the circuit achieves natural characteristic matching without complex calibration or design considerations
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
This configuration suppresses temperature-induced changes in detection voltage, ensuring stable output signals regardless of temperature variations, thereby improving the temperature dependency of the detector circuit.
Implementation Method 1
a first rectification element having an anode to which an input signal is inputted; a second rectification element having a cathode connected with a cathode of the first rectification element
Implementation Method 2
a current mirror circuit for supplying a current to the first rectification element, and for supplying a current-mirror current of the current to the second rectification element
Data Source
AI summary
A detector circuit in which a change in a detection voltage due to temperature is suppressed is provided. The detector circuit includes a first rectification element having an anode to which an input signal is inputted. A second rectification element has a cathode connected with a cathode of the first rectification element and has an anode connected to an output terminal. A current mirror circuit for supplying a current to the first rectification element and for supplying a current-mirror current of the current to the second rectification element is included in the detector circuit.