Technologies Available for License

2011-013: High Dynamic Range Measurements with Delayed Dissipative Feedback

Invention: 2011-013

Patent Status: U.S. Patent Number 9,071,219 was issued on June 30, 2015

For technical and licensing related questions, email tcp@bnl.gov.

Summary

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Delayed Dissipative Feedback (DDF) applied to a third order shaper.

This application-specific integrated circuit (ASIC) implements semi-Gaussian filters (pulse shapers) to detect signals with low noise and high resolution. Compared to other devices, this ASIC for Delayed Dissipative Feedback achieves higher dynamic range at comparable area and equal capacitance, improving the signal to noise ratio. Conventional designs based on voltage amplifiers with local feedbacks introduce noise that limits the dynamic range, but this novel design overcomes that obstacle.

Description

This ASIC for Delayed Dissipative Feedback delays wherever possible the feedback of the resistive (dissipative) components: the negative dissipative feedback through at least one resistor to an input of an amplifier of the shaper is provided from a voltage output by a subsequent circuit stage, and is delayed by one or more time constants. The design of low-noise linear shapers suggests that once the equivalent noise charge (ENC) from the charge amplifier is defined, then the dynamic range of the system is set by the voltage swing and the value of the capacitance to achieve the poles of the shaper. The configuration used to generate the pole(s) also has relevant impact. Configurations based on passive components in feedback offer a better dynamic range than those using both active and passive components, such as scaling mirrors.

Journal Publication & Intellectual Property

• Shaper Design in CMOS for High Dynamic Range (.pdf)
• US 9,071,219 B2 (.pdf)