Dual-Mode RF Transmitter Power Control for AGC-ALC Switching
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Solution Overview
Problem
Existing RF transmitters lack flexibility in switching between closed-loop and open-loop power control schemes, requiring physical modifications or replacement of components to change power control settings.
Innovation Solution
A dual-mode switchable power control circuit that can operate in both open-loop automatic gain control (AGC) and closed-loop automatic level control (ALC) modes using a dual-mode analog variable gain attenuator and a switch circuit, allowing for mode selection without adding significant components or signal requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are designed for closed-loop and open-loop power control schemes, then each control mode can be implemented effectively, but the device complexity increases and flexibility to switch between modes is reduced
Solution Approach 1:
The patent implements a universal power control circuit that can operate in both closed-loop ALC and open-loop AGC modes using the same hardware components. The circuit uses a single variable gain amplifier, power detector, and control circuitry that can function in either mode depending on the configuration of switches and control signals, eliminating the need for separate dedicated circuits for each control scheme.
Solution Approach 2:
The patent introduces dynamic switching capability that allows the power control circuit to transition between closed-loop and open-loop modes during operation. Control switches and mode selection logic enable the circuit to dynamically reconfigure its feedback path and control signal flow, providing operational flexibility without requiring physical modification or replacement of components.
2Adaptability or versatility
If the power control scheme is changed in previously known systems, then the control performance can be optimized for different applications, but the transmitter or components must be replaced or modified
Solution Approach 1:
The patent designs a universal power control circuit that incorporates both closed-loop ALC and open-loop AGC functionality within the same hardware architecture. Mode selection is achieved through electronic control switches and logic that route control signals appropriately, allowing the transmitter to adapt to different control schemes without physical modification or component replacement.
Solution Approach 2:
The patent pre-configures the circuit with all necessary components for both control modes, including feedback paths, control switches, and signal routing logic, during the initial design phase. This preliminary preparation enables seamless switching between control schemes during operation without requiring subsequent modifications or replacements of the transmitter or its components.
Data Source
AI summary
A dual-mode switchable power control circuit for an RF transmit signal path of an RF transmitter is switchable between an open-loop automatic gain control (AGC) mode and a closed-loop automatic level control (ALC) mode in the analog domain to provide power control for the RF transmit signal path. The open-loop AGC mode and the closed-loop ALC mode are both controlled based on the analog control signal on the same control line. In the open-loop AGC mode, the analog control signal corresponds to the AGC control voltage indicating a setpoint gain for the RF transmit signal path. In the closed-loop ALC mode, the analog control signal corresponds to an ALC reference voltage indicating a setpoint power output level for the RF transmit signal path.