Switched Capacitor Integrator-Summer Using One Operational Amplifier
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Solution Overview
Problem
Existing electronic devices, such as sigma-delta modulators, face challenges in reducing power consumption, size, weight, and manufacturing costs while increasing operating speed, particularly in switched capacitor integrator and summer circuits.
Innovation Solution
The implementation of a switched capacitor circuit design that utilizes a single operational amplifier to perform both integration and summing functions, incorporating specific branch configurations and clock phases to achieve the desired signal processing, thereby reducing the need for multiple components and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate operational amplifiers are used for integration and summing functions, then functional reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the integration and summing functions into a single operational amplifier by implementing switched capacitor circuits that perform both operations simultaneously. The first switched capacitor circuit performs integration while the second switched capacitor circuit performs summing, both utilizing the same operational amplifier, thereby reducing device complexity and power consumption while maintaining functional reliability.
Solution Approach 2:
The single operational amplifier is designed to serve multiple functions by implementing time-multiplexed switched capacitor circuits. The operational amplifier acts as both an integrator and a summer through different switching configurations, demonstrating multi-functionality that reduces the overall number of components needed in the system.
2Reliability
If multiple operational amplifiers are used for integration and summing, then functional performance is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple operational amplifier functions into a single device by using switched capacitor techniques. The first switched capacitor circuit integrates signals and the second switched capacitor circuit sums signals, both operations performed by one operational amplifier, thereby reducing power consumption while maintaining functional performance.
3Reliability
If multiple operational amplifiers are used for integration and summing, then functional capability is improved, but device size and weight increase
Solution Approach 1:
The patent combines multiple operational amplifier functions into a single device through switched capacitor circuit implementation. By integrating the integration and summing functions in one operational amplifier, the physical size and weight of the device are reduced while preserving full functional capability.
4Ease of manufacture
If simpler circuit configurations are used, then manufacturing cost is reduced, but operating speed decreases
Solution Approach 1:
The patent employs periodic switching actions in the switched capacitor circuits to achieve high-speed signal processing. The periodic switching of capacitors allows the single operational amplifier to rapidly perform both integration and summing operations, maintaining high operating speed while keeping the circuit configuration simple and cost-effective.
Data Source
AI summary
A switched capacitor circuit employs a single operational amplifier to implement both an integrator and a summer. One input signal is routed to the input of the operational amplifier through (1) one or more integration branches, and (2) one or more first summing branches. A second input signal is routed to the input of the operational amplifier through one or more second summing branches. Each of the branches includes a capacitor and a number of switches controlled by different clock phases. The switched capacitor circuit may be single-ended or differential. The circuit may be used in an access terminal of a cellular communication system. The access terminal may operate under a code division multiple access (CDMA) communication standard.