Transceiver Resistance Calibration Using Shared Transmitter Paths
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Solution Overview
Problem
Existing transceiving circuits face challenges in accurately calibrating resistance due to resistor drift within chips, requiring large calibration circuits that occupy significant space.
Innovation Solution
A transceiving circuit resistance calibration method that adjusts a variable resistance module based on output voltages generated by input currents, using a control unit to match the resistance of an inner chip resistor with a predetermined resistor, thereby compensating for drift and reducing the need for extensive calibration circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high accurate calibrating circuit is provided to achieve accurate resistance calibration, then resistance calibration accuracy is improved, but circuit area increases significantly
Solution Approach 1:
The patent makes the transmitter serve dual functions: normal signal transmission and resistance calibration. By injecting calibration currents through the same transmitter structure used for data transmission, the patent eliminates the need for separate dedicated calibration circuits, thereby achieving accurate resistance calibration while minimizing additional circuit area
Solution Approach 2:
The patent employs on-chip resistors to generate calibration currents and voltages self-contained within the chip. The transmitter uses its own internal resistors and power supply to generate calibration signals, eliminating dependence on external calibration equipment or large external circuitry, thus achieving accurate calibration with minimal area overhead
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 method effectively calibrates the resistance within transceiving circuits, minimizing the required calibration circuit area and maintaining accurate resistance matching, thus addressing the issue of resistor drift while optimizing space usage.
Implementation Method 1
resistance matching for a transmission path must be seriously concerned. Since drift occurs for the resistor inside the chip, a circuit that can calibrate resistance matching is needed
Data Source
AI summary
A transceiving circuit resistance calibrating method, which is applied to a transceiving circuit. The method includes: inputting a first current to a transmitter to generate a first output voltage, wherein the first current is generated according to a ratio between a predetermined voltage and an inner resistor of a chip; inputting a second current to a transmitter to generate a second output voltage, wherein the first current is generated according to a ratio between the predetermined voltage and a predetermined resistor; and adjusting a first adjustable resistance module according to a difference between the first output voltage and the second output voltage.