1

2

3
Anad Venkitachalam, Rajendra Datar, Krishnan Subramoniam: Sample rate converters with minimal conversion error and analog to digital and digital to analog converters using the same. Cirrus Logic, James J Murphy Esq, Winstead SEchrest & Minick, April 1, 2003: US06542094 (14 worldwide citation)

A sample rate converter for converting a data stream having a first base sampling frequency to a data stream having a second base sampling frequency. Up-sampling circuitry receives first oversampled data having a first oversampling ratio with respects to the first base frequency and outputs second o ...


4

5
Manoj Shridhar Soman, Krishnan Subramoniam, Rajendra Datar: Current steering digital to analog converters with self-calibration, and systems and methods using the same. Cirrus Logic, James J Murphy, Thompson & Knight, March 28, 2006: US07019677 (11 worldwide citation)

A current steering digital to analog converter includes a current source for selectively providing a selected amount of current to an output in response to input data. The current source includes a selected number of sub-current sources for selectively providing fractions of the selected amount of c ...


6

7
Anand Venkitachalam, Dylan Alexander Hester, Brian Frank Bounds, Rajendra Datar, Krishnan Subramoniam: Sample rate converters using virtual sample rates and analog to digital and digital to analog converters using the same. Cirrus Logic, James J Murphy Esq, Winstead Sechrest & Minick, November 4, 2003: US06642863 (10 worldwide citation)

A method of performing sample rate conversion in a data converter operating from an oversampling clock corresponding to a native sample rate and a native oversampling factor. A virtual sample rate and a virtual oversampling factor are selected proportional to the native sample rate and the native ov ...


8
Manoj Soman, Krishnan Subramoniam, Hua Hong, Rajendra Datar, John Laurence Melanson: Gain or input volume controller and method utilizing a modified R2R ladder network. Cirrus Logic, Steven Lin Esq, January 9, 2007: US07162029 (9 worldwide citation)

A gain or input volume controller and method includes a modified R2R ladder network having a number of R2R branches, switches coupled respectively to the R2R branches, and a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal. The swi ...


9
Manoj Soman, Sachin Ghanekar, Rajendra Datar: Frequency error detection methods and systems using the same. Cirrus Logic, Thompson & Knight, James J Murphy, February 1, 2005: US06850616 (2 worldwide citation)

A method of detecting frequency errors exceeding a predetermined limit in a sampled signal includes the step of determining a peak amplitude of the signal at a tone frequency for a first frame of samples of the sampled signals using a filter having a first amplitude versus frequency response. A peak ...


10
Manoj Soman, Krishnan Subramoniam, Hua Hong, Rajendra Datar, John Melanson: Gain or input volume controller and method utilizing a modified R2R ladder network. Cirrus Logic, Cirrus Logic Legal Department, December 2, 2004: US20040240918-A1

A gain or input volume controller and method includes a modified R2R ladder network having a number of R2R branches, switches coupled respectively to the R2R branches, and a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal. The swi ...