Low-Power AGC Circuit With Periodic Gain Control Updates
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Solution Overview
Problem
Conventional automatic gain control (AGC) circuits consume power continuously, making them unsuitable for power-constrained environments such as modern integrated circuits and electronics devices, where thermal considerations and increasing I/O counts shrink power budgets.
Innovation Solution
Implementing a low-power AGC circuit with a gain control memory to store and maintain the gain control value, allowing the update loop to be disabled after achieving desired amplification, and periodically re-enabled to compensate for drift, using digital or analog techniques to adjust the gain control signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gain control loop operates continuously to maintain desired signal amplification, then the signal amplification accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic sampling of the amplified signal to update the gain control value, rather than continuous monitoring. The gain control loop is activated at periodic intervals to sample the signal amplitude, update the gain control register, and then enters a low-power state until the next sampling period. This periodic operation maintains signal amplification accuracy while dramatically reducing average power consumption of the AGC circuit.
2Use of energy by moving object
If the gain control loop is disabled to reduce power consumption, then the power efficiency is improved, but the signal amplification stability deteriorates due to drift
Solution Approach 1:
The patent employs a feedback mechanism where the amplified signal is continuously monitored at periodic intervals, and the gain control value is adjusted based on the detected signal amplitude. The envelope detector extracts the amplitude information, which is then used to update the gain control register through a feedback loop. This feedback ensures that the signal amplification remains stable and compensates for any drift that occurs during the low-power intervals.
Solution Approach 2:
The system performs preliminary gain adjustment during active periods to compensate for anticipated drift during low-power intervals. By updating the gain control value before entering the low-power state, the system proactively maintains signal amplification stability throughout the entire operation cycle, preventing drift accumulation.
3Stability of the object's composition
If the update loop is continuously active to compensate for drift, then the signal amplification stability is improved, but the power consumption increases
Solution Approach 1:
The update loop is designed to operate periodically rather than continuously. It activates at predetermined intervals to sample the signal, detect amplitude changes, update the gain control register, and then enters a dormant state. This periodic update mechanism maintains signal amplification stability by compensating for drift at regular intervals while minimizing power consumption during the intervals between updates.
Data Source
AI summary
An integrated circuit device includes a variable-gain amplifier, memory circuit and gain control update circuit. The variable-gain amplifier generates an amplified signal having an amplitude according to a gain control value that is stored, at least during a first interval, within the memory circuit. The update circuit generates an updated gain control value based on the amplified signal during the first interval, and outputs the updated gain control value to the memory circuit to be stored therein at a conclusion of the first interval.