Multistage Amplifier Circuit With Shared Sampling and Gain Stages
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Solution Overview
Problem
Multistage amplifying circuits in FM and AM radio receivers require a high gain ratio and efficient handling of multiple analog input voltages, but existing designs lack the ability to effectively alternate between sampling and amplifying these voltages using a common amplifier.
Innovation Solution
A multistage amplifying circuit design that includes a first and second amplifying circuit, each capable of sampling or amplifying analog voltages relative to digital voltages, with a common amplifier that resets and determines output voltages based on control signals, utilizing capacitors and switches to manage voltage differences and a compensation capacitor for stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple amplifying circuits are connected in series to achieve high gain, then the gain ratio is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple amplifying circuits (first amplifying circuit and second amplifying circuit) into a single integrated system with a common amplifier that serves both circuits. This merging approach achieves high gain ratio through the cascaded amplification stages while reducing overall device complexity by sharing common components such as the common amplifier, power supply connections, and control signal distribution.
Solution Approach 2:
The common amplifier serves multiple functions by amplifying signals from both the first and second amplifying circuits. Additionally, the amplifier circuits are designed to handle multiple operations (sampling and amplification) through control signals, making each component multi-functional and thereby reducing the total number of components needed in the system.
2Device complexity
If a common amplifier is used to process multiple analog voltages, then the device complexity is reduced, but the ability to simultaneously process multiple signals is worsened
Solution Approach 1:
The patent implements periodic action through time-division multiplexing where the common amplifier alternates between processing signals from the first amplifying circuit and the second amplifying circuit based on control signals. The amplifier processes one signal at a time in periodic intervals, which reduces device complexity by using a single amplifier while maintaining the ability to handle multiple analog voltages through sequential processing.
Solution Approach 2:
The system dynamically switches the operation mode of the amplifying circuits and the common amplifier based on control signals. The first and second amplifying circuits can alternatively perform sampling or amplification operations, and the common amplifier dynamically selects which circuit's output to process. This dynamic reconfiguration allows a single common amplifier to effectively handle multiple signals without requiring simultaneous processing capability.
3Reliability
If amplifying circuits alternatively sample or amplify signals, then the memory effects are reduced, but the control complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where control signals monitor the operational state of the amplifying circuits and adjust their operation accordingly. The system uses feedback to alternatively switch between sampling and amplification modes, ensuring that memory effects are reduced while maintaining coordinated control. The control complexity is managed through systematic feedback loops that automatically regulate the switching between different operational states.
Data Source
AI summary
A multistage amplifying circuit includes a first amplifying circuit that either samples a first analog voltage input or amplifies a difference between the first analog voltage and a first digital voltage converted from the first analog voltage, in response to a control signal. A second amplifying circuit either samples a second analog voltage input or amplifies a difference between the second analog voltage and a second digital voltage converted from the second analog voltage, in response to the control signal. A common amplifier receives output voltages of the first amplifying circuit and the second amplifying circuit and either resets the output voltage of the first amplifying circuit and determines an output voltage by using the second amplifying circuit, or resets the output voltage of the second amplifying circuit and determines an output voltage by using the first amplifying circuit, in response to the control signal.