Qualcomm Incorporated

Changsok Han

Liang Dai

Omid Rajaee

Dinesh Jagannath Alladi

Seyed Arash Mirhaj

Kentaro Yamamoto

Ganesh Kiran

Li Lu

Certain aspects of the present disclosure provide apparatus and techniques for analog-to-digital conversion using a time-to-digital converter (TDC). For example, certain aspects provide a quantizer using a TDC. The quantizer may include at least one first capacitive element and a set of switches configured to selectively couple a first terminal and a second terminal of the at least one first capacitive element to at least one input voltage source. The TDC may also include a reference voltage source, at least one switch coupled between the second terminal of the at least one first capacitive element and an output of the reference voltage source, a current source selectively coupled to the first terminal of the at least one first capacitive element, and a voltage sense circuit coupled to the first terminal of the at least one first capacitive element.

Time-to-digital converter (TDC)-based quantizer

Certain aspects of the present disclosure provide a delta-sigma modulator (DSM) using time-interleaved (TI) successive approximation register (SAR) analog-to-digital converters (ADCs). For example, two SAR ADCs may be configured to alternately sample and process an input signal and provide a feedback signal for the DSM using excess loop delay (ELD). In other aspects, the DSM may be implemented using a two-step SAR quantizer. For example, a first SAR ADC may sample an input signal to generate a most-significant bit (MSB) portion of an output of the DSM, while the second SAR ADC may subsequently sample a residue from the first SAR ADC conversion and generate a least-significant bit (LSB) portion of the output of the DSM. With these techniques, higher bandwidths may be obtained in high accuracy delta-sigma ADCs without using increased sampling rates.

Delta-sigma analog-to-digital converter (ADC) with time-interleaved (TI) or two-step successive approximation register (SAR) quantizer

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Gainesville, FL, United States of America

Changsok Han