Wireless Transceiver Mixer LC Tank Calibration
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Solution Overview
Problem
Wireless transceivers often experience process errors during mass production, leading to suboptimal flatness due to parameter tolerance issues, which can result in circuit saturation and poor linearity when attempting to compensate with increased power in baseband or intermediate frequency circuits.
Innovation Solution
A method and circuit for calibrating wireless transceivers by adjusting the LC tank circuit parameters of the mixer and power amplifier, involving iterative measurement and adjustment of inductance and capacitance to determine optimal target parameters, thereby enhancing flatness without causing circuit saturation or reducing linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power of the baseband circuit or IF circuit is increased to compensate for RF power deficiency, then the RF power output is improved, but the linearity of the baseband circuit or IF circuit deteriorates and circuit saturation occurs
Solution Approach 1:
The patent adjusts the inductance and capacitance parameters of the LC tank circuit to optimize the frequency response and achieve better flatness. By changing these physical parameters, the system can compensate for process errors and achieve the desired RF power output without increasing baseband or IF circuit power, thereby avoiding linearity degradation and saturation.
2Productivity
If the inductance or capacitance parameters of the LC tank circuit are not optimally adjusted during mass production, then manufacturing efficiency is improved, but the flatness of the wireless transceiver deteriorates
Solution Approach 1:
The patent implements a self-calibration mechanism where the wireless transceiver automatically measures its own flatness and adjusts the LC tank circuit parameters accordingly. This allows the system to compensate for process errors during or after mass production without requiring manual adjustment, thereby maintaining both high productivity and manufacturing precision.
Solution Approach 2:
The patent introduces a feedback mechanism that measures the actual flatness performance and uses this information to adjust the LC tank circuit parameters. The control circuit receives feedback about the flatness and automatically adjusts the inductance or capacitance to achieve optimal performance, resolving the contradiction between mass production efficiency and manufacturing precision.
3Manufacturing precision
If manual adjustment of LC tank circuit parameters is performed for each unit, then the flatness is improved, but the manufacturing complexity and time consumption increase
Solution Approach 1:
The patent enables the wireless transceiver to perform self-calibration automatically without requiring manual intervention. The system measures its own flatness performance and adjusts the LC tank circuit parameters autonomously, eliminating the time-consuming manual adjustment process while maintaining high flatness precision.
Solution Approach 2:
The patent performs the parameter adjustment automatically during the manufacturing process or initial setup, so that by the time the product is deployed, the LC tank circuit is already optimized. This preliminary automatic calibration eliminates the need for time-consuming manual adjustment later, reducing both manufacturing complexity and time consumption.
Data Source
AI summary
The present invention discloses a calibration method and calibration circuit for a wireless transceiver. The wireless transceiver includes a transmission path and a reception path, and there is a mixer on the transmission path. The calibration method includes the following steps: (A) adjusting a first parameter of a first LC tank circuit of the mixer; (B) receiving a first input signal via a coupling path and the reception path; (C) measuring a first power of the first input signal; (D) repeating steps (A) to (C) to obtain multiple first powers; and (E) determining a first target parameter corresponding to a largest power of the first powers.