Inventor

WELLAND DAVID R

US142 patents

⚠️ This page may combine multiple inventors who share the name “WELLAND DAVID R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

WELLAND DAVID R

SILICON LAB INC

Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications

Method and apparatus for providing coarse and fine tuning control for synthesizing high-frequency signals for wireless communications

Analog isolation system with digital communication across a capacitive barrier

Digital isolation system with hybrid circuit in ADC calibration loop

Digital isolation system with ADC offset calibration

Method and apparatus for generating a variable capacitance for synthesizing high-frequency signals for wireless communications

PLL synthesizer having phase shifted control signals

Method and apparatus for providing analog and digitally controlled capacitances for synthesizing high-frequency signals for wireless communications

Direct digital access arrangement circuitry and method for connecting to phone lines

Method and apparatus for synthesizing high-frequency signals utilizing on-package oscillator circuit inductors

Digital expander apparatus and method for generating multiple analog control signals particularly useful for controlling a sub-varactor array of a voltage controlled oscillator

Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications

RF power detector

Direct digital access arrangement circuitry and method for connecting DSL circuitry to phone lines

Isolation system with digital communication across a capacitive barrier

Low voltage circuits powered by the phone line

Method and apparatus for adjusting a digital control word to tune synthesized high-frequency signals for wireless communications

Isolation system with digital communication across a capacitive barrier

Phase locked loop circuitry for synthesizing high-frequency signals and associated method

Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications

Analog isolation system with digital communication across a capacitive barrier

Method and apparatus for generating a discretely variable capacitance for synthesizing high-frequency signals for wireless communications

Analog isolation system with digital communication across a capacitive barrier

Method and apparatus for eliminating floating voltage nodes within a discreetly variable capacitance used for synthesizing high-frequency signals for wireless communications

Analog isolation system with digital communication across a capactive barrier

External resistor and method to minimize power dissipation in DC holding circuitry for a communication system

Digital isolation system with ADC offset calibration

Isolation system with digital communication across a capacitive barrier

Analog isolation system with digital communication across a capacitive barrier

Apparatus and method for resetting delta-sigma modulator state variables using feedback impedance

Direct digital access arrangement circuitry and method for connecting to phone lines

Direct digital access arrangement circuitry and method for connecting to phone lines

Isolation system with digital communication across a capacitive barrier

Digital expander apparatus and method for generating multiple analog control signals particularly useful for controlling an oscillator

Direct digital access arrangement circuitry and method for connecting to phone lines

CIRRUS LOGIC INC

Histogram-based automatic gain control method and system for video applications

Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors

Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery

Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer

Read channel having auto-zeroing and offset compensation, and power-down between servo fields

Timing recovery circuit for synchronous waveform sampling

Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium

CRYSTAL SEMICONDUCTOR CORP

Method for tone avoidance in delta-sigma converters

Delta-sigma analog-to-digital converter with chopper stabilization at the sampling frequency

Self-calibration method for capacitors in a monolithic integrated circuit

SILICON LAB

Apparatus and methods for generating radio frequencies in communication circuitry using multiple control signals

Isolation system with digital communication across a capacitive barrier

(unassigned)

Absolute power detector

ANALOG DEVICES INC

Two phase sampling for a delta sigma modulator

ANALOG DEVICE INC

Delta sigma modulator having programmable gain/attenuation