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Siddharth Devarajan, Lawrence A Singer, Prawal Man Shrestha, Pingli Huang: Methods and systems for reducing order-dependent mismatch errors in time-interleaved analog-to-digital converters. Analog Devices, Patent Capital Group, March 22, 2016: US09294112 (5 worldwide citation)

A time-interleaved analog-to-digital converter (ADC) uses M sub-analog-to-digital converters (sub-ADCs) to, according to a sequence, sample an analog input signal to produce digital outputs. When the M sub-ADCs are interleaved, the digital outputs exhibit mismatch errors between the M sub-ADCs due t ...


2
Lawrence A Singer, Siddharth Devarajan: Apparatus and method for reducing sampling circuit timing mismatch. Analog Devices, Patent Capital Group, October 21, 2014: US08866652 (2 worldwide citation)

An example apparatus, system, and method for sampling in an interleaved sampling circuit having multiple channels. In an embodiment, an input clock is used to synchronize the transitions of sampling clocks from a first to second voltage level, relative to one another. The sampling clocks are input t ...


3
Siddharth Devarajan, Eric Otte, Nevena Rakuljic, Carroll C Speir: Randomly sampling reference ADC for calibration. ANALOG DEVICES, Patent Capital Group, December 20, 2016: US09525428 (2 worldwide citation)

Analog-to-digital converters (ADCs) can have errors which can affect their performance. To improve the performance, many techniques have been used to compensate or correct for the errors. When the ADCs are being implemented with sub-micron technology, ADCs can be readily and easily equipped with an ...


4
Siddharth Devarajan, Lawrence A Singer: Low-distortion programmable capacitor array. Analog Devices, Patent Capital Group, August 11, 2015: US09106210 (1 worldwide citation)

In one example embodiment, a programmable capacitor array is provided for low distortion and minimizing linearity degradation of an input (Vin) by utilizing control circuitry to switch on and off an array of MOSFET switches. The control circuitry turns on a MOSFET to load a capacitance on Vin and tu ...


5
Siddharth Devarajan, Lawrence A Singer: Bootstrapped switching circuit with fast turn-on. ANALOG DEVICES, Patent Capital Group, May 2, 2017: US09641166

An apparatus and method for implementing a bootstrapped switching circuit having improved (i.e. faster) turn-on time is provided. In an embodiment, an inner switching loop is implemented in a bootstrapped switching circuit where the inner switching loop is configured to turn on an input switch in th ...