Analog Devices Global Unlimited Company

Analog Devices International Unlimited Company

Shanthi Pavan Yendluri

Hajime Shibata

Donald W Paterson

Victor Kozlov

Christopher W Mangelsdorf

Embodiments may relate to a circuit for use in an analog-to-digital converter (ADC) circuit. The circuit may include a first residue amplifier stage and a second residue amplifier stage. The circuit may further include a synthesized delay stage with a digital-to-analog converter (DAC) electrically positioned between a signal input and the input of the second residue amplifier stage. The circuit may further include a resistor electrically positioned between the signal input and the input of the second residue amplifier stage. Other embodiments may be described or claimed.

Analog-to-digital convertor (ADC) with a synthesized delay stage

Continuous-time pipeline analog-to-digital converters can achieve excellent performance, and avoid sampling-related artifacts traditionally associated with discrete-time pipeline ADCs. However, the continuous-time circuitry in the ADCs can pose a challenge for digital signal reconstruction, since the transfer characteristics of the continuous-time circuitry are not as well characterized or as simple as their discrete-time counterparts. To achieve perfect digital signal reconstruction, special techniques are used to implement an effective and efficient digital filter that combines the digital output signals from the stages of the CT ADCs.

Oversampled continuous-time pipeline ADC with digital signal reconstruction

Residue generation systems for use in continuous-time and hybrid ADCs are disclosed. An example residue generation system includes at least one stub filter, configured to generate a modified analog input based on an analog input, and a quantizer, configured to generate a digital input to a feedforward DAC based on the modified analog input generated by the filter. The feedforward DAC is configured to generate a feedforward path analog output based on the digital input generated by the quantizer, and the system may further be configured to generate a residue signal based on the feedforward path analog output. Providing one or more stub filters that filter the analog input before it is quantized by the quantizer advantageously allows blockers to be attenuated before they are sampled and aliased by the quantizer.

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Chennai, India

Shanthi Pavan Yendluri