1
Richard E Schreier: Mismatch shaping Δ-Σ analog to digital converter system. Analog Devices, Iandiorio Teska & Coleman, September 2, 2008: US07420494 (12 worldwide citation)

A mismatch shaping ΔΣ analog to digital converter system includes a plurality of internal ΔΣ analog to digital submodulators to provide an output; a feedback circuit including a feedback digital to analog converter responsive to the output; a summing circuit for providing the difference of an analog ...


2
Richard E Schreier, Donald Paterson: Continuous time ΔΣ modulator system with automatic timing adjustment. Analog Devices, Iandiorio & Teska, January 1, 2008: US07315269 (8 worldwide citation)

A continuous time ΔΣ modulation system with automatic timing adjustment includes a loop filter having continuous time elements for receiving an input; and an ADC for sampling the output from the loop filter in response to an ADC clock; a DAC responsive to the output from the ADC for feeding back an ...


3
Yunzhi Dong, Zhao Li, Richard E Schreier, Hajime Shibata, Trevor Clifford Caldwell: LC lattice delay line for high-speed ADC applications. Analog Devices Global, Patent Capital Group, April 12, 2016: US09312840 (5 worldwide citation)

This disclosure describes techniques and methodologies of using passive continuous time (CT) delay line for high-speed CT analog-to-digital converter (ADC) applications. In a continuous-time residual producing stage common to these CT ADCs, a proper delay between the analog input and DAC output is c ...


4
Richard E Schreier, Wenhua Yang, Hajime Shibata: Quadrature bandpass ΔΣ converter. Analog Devices, Iandiorio & Teska, August 28, 2007: US07262726 (5 worldwide citation)

An improved quadrature bandpass ΔΣ converter includes a loop filter, an ADC responsive to the loop filter, and a first feedback DAC responsive to the ADC; a first summing circuit is responsive to the first DAC and an analog input for providing an input to the loop filter; a second feedback DAC is re ...


5
Steven C Rose, Richard E Schreier: Low-noise programmable current source. Analog Devices, Iandiorio Teska & Coleman, September 16, 2008: US07425909 (5 worldwide citation)

A low-noise programmable current source includes an output digital to analog converter for providing an output load current; and a control circuit, responsive to an input defining a predetermined load current for generating, for the digital to analog converter, a control word and a control voltage; ...


6
Richard E Schreier, Hassan L Bahy: ΔΣ analog to digital converter system with automatic gain control responsive to out-of-band interferers. Analog Devices, Iandiorio Teska & Coleman, October 21, 2008: US07439890 (3 worldwide citation)

An improved ΔΣ analog to digital converter system with automatic gain control response to out-of-band interferers including a ΔΣ multibit analog to digital converter responsive to an analog input for providing a digital output including the in-band signal and out-of-band interferers and quantization ...


7
Wenhua W Yang, Richard E Schreier: Generating comparator thresholds using a rotating ring of resistors. Analog Devices Global, Patent Capital Group, August 23, 2016: US09425816 (2 worldwide citation)

Data converters convert signals in analog form to digital form or from digital form to analog form. Due to mismatches between devices that are intended to be identical (unary elements), some data converters outputs may have undesirable characteristics, such as non-linearities. Shuffling the inputs t ...


8
Yunzhi Dong, Hajime Shibata, Wenhua W Yang, Richard E Schreier: Multi-stage noise shaping analog-to-digital converter. Analog Devices Global, Patent Capital Group, November 3, 2015: US09178529 (2 worldwide citation)

The present disclosure describes an improved multi-stage noise shaping (MASH) analog-to-digital converter (ADC) for converting an analog input signal to a digital output signal. In particular, a full delta-sigma (ΔΣ) modulator is provided at the front-end of the MASH ADC, and another full ΔΣ modulat ...


9
David Nelson Alldred, Jipeng Li, Richard E Schreier, Hajime Shibata: Integrator output swing reduction. ANALOG DEVICES GLOBAL, Patent Capital Group, June 9, 2015: US09054731 (1 worldwide citation)

In one example implementation, the present disclosure provides a loop filter for use in a continuous-time sigma-delta analog-to-digital converter. Specifically, a capacitive feedback digital-to-analog converter path is provided at the input of a first opamp in a series of opamp integrators. The capa ...


10
Trevor Clifford Caldwell, Richard E Schreier, David Alldred, Wenhua W Yang: Electric signal conversion. Analog Devices Technology, Patent Captial Group, December 16, 2014: US08912936 (1 worldwide citation)

In one aspect, an electrical signal converter is disclosed. The exemplary electrical signal converter may include a plurality of ordered converter elements. Element selection logic may be provided to pseudorandomly select a pointer to a switch matrix, wherein the switch matrix maps converter element ...