Self-Calibrating Transceiver State Machine
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Solution Overview
Problem
Existing transceiver designs face challenges in meeting precise design specifications due to analog block imperfections, leading to increased power consumption, design complexity, and factory calibration time, which elevates production costs.
Innovation Solution
A self-calibrating transceiver system that utilizes a calibration control state machine to adjust transmitter and receiver chains, measuring signal strength indicators to compensate for imperfections without factory calibration, leveraging existing hardware for efficient in-field compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog design methods are used to address design specifications, then performance requirements are met, but power consumption increases and design complexity increases
Solution Approach 1:
The transceiver performs self-calibration by having the transmitter chain transmit test signals that are received by the receiver chain, which then measures RSSI values and automatically adjusts calibration parameters without external intervention. This eliminates the need for factory calibration equipment and reduces design complexity while maintaining performance compliance.
Solution Approach 2:
The system dynamically adjusts calibration parameters (such as RSSI offset values) based on measured signals and operating conditions. By changing these parameters adaptively rather than using fixed analog compensation circuits, the system meets design specifications with simpler digital circuitry.
2Manufacturing precision
If factory calibration is used to compensate for analog imperfections, then manufacturing precision is improved, but factory calibration time increases and production cost increases
Solution Approach 1:
The transceiver autonomously performs calibration by transmitting test signals through its own transmitter chain and measuring them with its receiver chain. The system automatically determines calibration parameters without requiring factory calibration equipment or technician intervention, thereby eliminating calibration time from the production process while maintaining accuracy.
Solution Approach 2:
The self-calibration function is built into the transceiver design and can be executed automatically during or after manufacturing. This preliminary calibration action is integrated into the device itself, allowing mass production to proceed without dedicated calibration steps while ensuring each unit is calibrated to required precision.
3Ease of manufacture
If digital compensation circuits are added for factory calibration, then ease of manufacture is improved, but factory calibration time increases
Solution Approach 1:
The transceiver uses its existing transmitter and receiver chains to perform self-calibration. The transmitter transmits test signals and the receiver measures RSSI values, allowing the system to automatically determine calibration parameters without requiring external factory calibration equipment or time-consuming manual calibration procedures.
Solution Approach 2:
The existing transmitter and receiver chains are used for multiple purposes: normal communication operations and self-calibration functions. This multi-functionality eliminates the need for separate calibration equipment or dedicated calibration hardware, maintaining ease of manufacture while removing the time loss associated with factory calibration.
Data Source
AI summary
A self-calibrating transceiver includes a transmitter chain, a receiver chain, a base band processor, and a calibration control state machine. The state machine is in electrical communication with the transmitter chain, the receiver chain, and the base band processor, and is configured for enabling the receiver chain and setting the receiver chain and the transmitter chain to corresponding frequencies. The state machine stores one or more transmitter power and power amplifier gain mode settings, and for each setting, sets the transmitter gain and power amplifier gain mode. The transmitter chain transmits a signal, the receiver chain receives the transmitted signal, and the baseband processor measures a received signal strength indicator (RSSI) of the received signal. The state machine further adjusts the transmitter output power based on the measured RSSI.