Shared Amplifier Switch-Capacitor Filter for Lower Power
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Solution Overview
Problem
Conventional filter circuits in network transceivers require multiple fully-differential amplifiers, leading to high power consumption and increased manufacturing costs, necessitating a design that reduces the number of amplifiers to achieve power-saving and compactness.
Innovation Solution
A filter circuit that shares a common fully-differential amplifier with other circuits using a switch-capacitor circuit, allowing the input and output signals to generate the same transfer function across multiple state periods, thereby reducing the need for multiple amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fully-differential amplifiers are installed in the IPR filter and ADC, then the signal processing performance is improved, but the power consumption and circuit size increase
Solution Approach 1:
The patent merges the amplifier resources by having the IPR filter and ADC share a common fully-differential amplifier. The amplifier is time-multiplexed between the IPR filter operation and the ADC operation, eliminating the need for separate amplifiers in both circuits. This combining approach reduces the total number of amplifiers from two to one, directly addressing the power consumption and circuit size issues while maintaining signal processing performance.
Solution Approach 2:
The fully-differential amplifier is designed to perform multiple functions by serving both the IPR filter and the ADC. Through time-division multiplexing, the same amplifier circuit handles different signal processing tasks at different time intervals, making it a universal component that replaces what would traditionally require dedicated amplifiers for each function.
2Reliability
If multiple fully-differential amplifiers are installed in the IPR filter and ADC, then the signal processing performance is improved, but the manufacturing cost increases
Solution Approach 1:
By merging the amplifier functions into a single shared component, the patent reduces the bill of materials and assembly complexity. Fewer amplifiers mean fewer components to source, test, and assemble, directly reducing manufacturing costs while maintaining the required signal processing capabilities through time-multiplexed operation.
3Reliability
If multiple fully-differential amplifiers are installed in the IPR filter and ADC, then the signal processing performance is improved, but the circuit size increases
Solution Approach 1:
The patent combines what would be two separate amplifier circuits into one shared amplifier, significantly reducing the silicon area or PCB space required. The time-multiplexing architecture allows a single amplifier to handle both the IPR filter and ADC functions, eliminating redundant circuitry and reducing overall circuit footprint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution achieves the same signal-to-noise ratio and peak-to-average ratio reduction as conventional designs while saving one fully-differential amplifier, thus reducing power consumption and circuit size.
Implementation Method 1
a switch-capacitor circuit for storing charges generated by both the input signal and the output signal
Data Source
AI summary
A filter circuit is disclosed which comprises a differential amplifier and a switch-capacitor circuit. The invention attains the goals of reducing the power consumption and the circuit size by sharing an amplifier with other related circuits to reduce the number of amplifiers.