公开(公告)号：US10181860B1

公开(公告)日：2019-01-15

申请号：US15794367

申请日：2017-10-26

Applicant: Analog Devices Global Unlimited Company

Inventor： Sharvil Pradeep Patil ,  Hajime Shibata ,  Wenhua William Yang ,  David Nelson Alldred ,  Yunzhi Dong ,  Gabriele Manganaro ,  Kimo Tam

IPC: H03M1/14 ,  H03M1/06 ,  H03M1/00 ,  H03M3/00

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.

公开(公告)号：US10187075B1

公开(公告)日：2019-01-22

申请号：US15974548

申请日：2018-05-08

Applicant: Analog Devices Global Unlimited Company

Inventor： Sharvil Pradeep Patil ,  Hajime Shibata ,  Yunzhi Dong ,  David Nelson Alldred ,  Frank Murden ,  Lawrence A. Singer

IPC: H03M1/00 ,  H03M1/16 ,  H03M1/06

Abstract: Residue generation systems for use in continuous-time and hybrid ADCs are described. An exemplary system includes a filter, e.g. a FIR filter, for generating a filtered analog output based on an analog input, a quantizer for generating a digital input to a feedforward DAC based on the filtered analog output generated by the filter, a feedforward DAC for generating a feedforward path analog output based on the digital input generated by the quantizer, and a subtractor for generating a residue signal based on the feedforward path analog output. Providing a filter that filters the analog input before it is quantized advantageously allows blockers to be attenuated before they are sampled and aliased by the quantizer. At least some of the residue generation systems described herein may be implemented with relatively small design and power dissipation overheads.