Reducing residue signals in analog-to-digital converters

US10181860B1 · kind B1 · utility

Assignee

• Analog Devices Global Unlimited Company · BM

Inventors

• Sharvil Pradeep Patil · New York, US
• Hajime Shibata · Toronto, CA
• Wenhua Yang · North Andover, US
• David Alldred · Toronto, CA
• Yunzhi Dong · Weehawken, US
• Gabriele Manganaro · Winchester, US
• Kimo Tam · Lincoln, US

Key dates

• Filing date: Oct 26, 2017
• Grant date: Jan 15, 2019
• Expiry date: Oct 26, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/164
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A residue generation apparatus for use in continuous-time and hybrid ADCs is proposed. The apparatus includes a quantizer for digitizing an analog input to generate a digital output, and means for applying a first transfer function to the digital output from the quantizer to generate a digital input to a feedforward DAC, based on which the DAC can generate a feedforward path analog output. The apparatus further includes means for applying a second, continuous-time, transfer function to the analog input provided to the quantizer to generate a forward path analog output, and a subtractor for generating a residue signal based on a difference between the forward path analog output and the feedforward path analog output. Proposed apparatus allows selecting a combination of the first and second transfer functions so that, when each is applied in its respective path, the residue signal passed to further stages of an ADC is reduced.