Switchable Transconductor Circuit for Bandwidth-Noise Tradeoffs
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Solution Overview
Problem
Transconductor circuits face challenges in simultaneously reducing flicker noise and maintaining suitable bandwidth, as large-area devices that minimize flicker noise result in high capacitance, making them unsuitable for wide-bandwidth applications.
Innovation Solution
A transconductor circuit with a programmable tradeoff between bandwidth and flicker noise is implemented, featuring a switch arrangement that adjusts coupling between input and output ports and transistors to operate in either a low-noise mode with higher capacitance or a wide-bandwidth mode with lower capacitance, allowing for flexible operation based on application requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large-area MOSFETs are used to reduce flicker noise, then flicker noise is reduced, but input capacitance increases making the circuit unsuitable for wide-bandwidth applications
Solution Approach 1:
The patent implements dynamic reconfiguration of the transistor arrangement through switch circuits that can change the coupling between input/output ports and transistors. This allows the input capacitance to be dynamically adjusted between a first value (for narrow-bandwidth applications) and a second value (for wide-bandwidth applications), enabling the same circuit to adapt to different bandwidth requirements while managing flicker noise appropriately for each application type.
Solution Approach 2:
The patent changes the electrical parameters of the transconductor circuit by reconfiguring the transistor arrangement. By switching between different coupling configurations, the input capacitance parameter is changed from a first value to a second value, allowing optimization for either narrow-bandwidth or wide-bandwidth applications as needed.
2Object-affected harmful factors
If large-area devices are used to minimize flicker noise, then flicker noise performance improves, but the circuit becomes unsuitable for wide-bandwidth signals due to high capacitance
Solution Approach 1:
The switch arrangement enables dynamic reconfiguration of the transistor coupling, allowing the circuit to switch between a first operating mode (with first input capacitance value) and a second operating mode (with second input capacitance value). This dynamic adjustment allows optimization for either low flicker noise or high bandwidth depending on the application requirements.
Solution Approach 2:
The patent changes the input capacitance parameter from a first value to a second value by reconfiguring the transistor arrangement through switch circuits, enabling the circuit to achieve either low flicker noise performance or wide bandwidth performance as required by the specific application.
3Object-affected harmful factors
If a single semiconductor product is designed for narrow-bandwidth applications with reduced flicker noise, then flicker noise is minimized, but the product cannot be used for wide-bandwidth applications
Solution Approach 1:
The patent makes the transconductor circuit universal by incorporating switch arrangements that enable it to operate in multiple modes. The circuit can be configured for narrow-bandwidth applications with optimized flicker noise performance or for wide-bandwidth applications with adjusted input capacitance, allowing a single semiconductor product to serve both application types effectively.
Solution Approach 2:
The dynamic reconfiguration capability through switch circuits allows the same transconductor circuit to adapt its characteristics for different application types, making it versatile enough to handle both narrow-bandwidth and wide-bandwidth applications with appropriate flicker noise management for each.
Data Source
AI summary
Transconductor circuits with programmable tradeoff between bandwidth and flicker noise are disclosed. An example circuit includes an input port, an output port, a plurality of transistors, and a switch arrangement that includes a plurality of switches, configured to change coupling between the input port, the output port, and the transistors to place the transconductor circuit in a first or a second mode of operation. An input capacitance of the transconductor circuit operating in the first mode is larger than when the transconductor circuit is operating in the second mode. In the first mode, having a larger input capacitance results in a decreased flicker noise because the amount of flicker noise is inversely proportional to the input capacitance. In the second mode, having a smaller input capacitance leads to an increased flicker noise but that is acceptable for wide-bandwidth applications because wide-bandwidth signals may be less sensitive to flicker noise.