Analog Devices, Inc., also known as ADI or Analog, is an American multinational semiconductor company specializing in data conversion and signal conditioning technology, headquartered in Norwood, Massachusetts. In 2012, Analog Devices led the worldwide data converter market with a 48.5% share, according to analyst firm Databeans.The company manufactures analog, mixed-signal and digital signal processing integrated circuits used in electronic equipment. These technologies are used to convert, condition and process real-world phenomena, such as light, sound, temperature, motion, and pressure into electrical signals.Analog Devices has approximately 60,000 customers, in the following industries: communications, computer, industrial, instrumentation, military/aerospace, automotive, and high-performance consumer electronics applications. Wikipedia.
Taylor G.,Analog Devices Inc. |
Galton I.,University of California at San Diego
IEEE Journal of Solid-State Circuits | Year: 2013
This paper presents a second-generation mostly-digital background- calibrated oversampling ADC based on voltage-controlled ring oscillators (VCROs). Its performance is in line with the best ΔΣ modulator ADCs published to date, but it occupies much less circuit area, is reconfigurable, and consists mainly of digital circuitry. Enhancements relative to the first-generation version include digitally background-calibrated open-loop V/I conversion in the VCRO to increase ADC bandwidth and enable operation from a single low-voltage power supply, quadrature coupled ring oscillators to reduce quantization noise, digital over-range correction to improve dynamic range and enable graceful overload behavior, and various circuit-level improvements. The ADC occupies 0.075 mm2 in a 65 nm CMOS process and operates from a single 0.9-1.2 V supply. Its sample-rate is tunable from 1.3 to 2.4 GHz over which the SNDR spans 70-75 dB, the bandwidth spans 5-37.5 MHz, and the minimum SNDR+ 10log(bandwidth/power dissipation) figure of merit (FOM) is 160 dB. © 1966-2012 IEEE.
Kusuda Y.,Analog Devices Inc.
IEEE Journal of Solid-State Circuits | Year: 2010
This paper proposes a local feedback, named Auto Correction Feedback (ACFB), for a chopper amplifier to suppress its offset related ripple. It nulls out the amplifier's initial offset in DC domain which would otherwise become modulated ripple at the chopper amplifier's output, instead of filtering the ripple with a post filter. The proposed ACFB has been implemented as a stand alone chopper operational amplifier fabricated in 0.64 mm2 die area with a 0.35 μm standard CMOS process. It achieves 10μV maximum input offset voltage and 95 nV/rt(Hz) input voltage noise spectrum density flat down to 0.1 Hz, with a 1.8-5.5 V supply voltage range and 13 μA supply current dissipation. When configured in unity-gain, the typical magnitude of the input referred ripple at the chopping frequency is 9.4 μVrms, as a result of 45 dB ripple attenuation obtained by the ACFB. The analysis, the simulation, and the measurement prove there is no noise penalty due to the addition of ACFB. © 2006 IEEE.
Analog Devices Inc. | Date: 2015-02-11
Apparatus and method for an output stage of an amplifier are disclosed. A current source circuit provides current to a transistor connected to the amplifier output node to produce output voltage, and the current source circuit has two current mirror paths, one of which replicates the output voltage at the output node. As the output voltage approaches rail, more current is steered to the current mirror path not replicating the output voltage and provides additional current or voltage necessary to keep the current source circuit operational.
Analog Devices Inc. | Date: 2015-12-10
Embodiments of the present invention may provide a receiver. The receiver may include an RF section, a local oscillation signal generator to generate quadrature local oscillation signals, and a quadrature mixture, coupled to the RF section, to downconvert a first group of wireless signals directly to baseband frequency quadrature signals and to downconvert a second group of wireless signals to intermediate frequency quadrature signals. The receiver may also include a pair of analog-to-digital converters (ADCs) to convert the downconverted quadrature signals to corresponding digital quadrature signals. Further, the receiver may include a digital section having two paths to perform signal processing on the digital baseband frequency quadrature signals and to downconvert the digital intermediate frequency signals to baseband cancelling a third order harmonic distortion therein. Moreover, the receiver may include a phase corrector to adjust a phase of one of the local oscillation signals to balance the third order harmonic distortion and a gain offset generator to adjust a gain of one of the downconverted signals to balance the third order harmonic distortion.
Analog Devices Inc. | Date: 2015-04-28
Practical electronics such as amplifiers or voltage references can have circuit imbalances due to manufacturing imperfections. For example, amplifiers can have an undesirable offset voltage. The offset voltage might also drift with temperature making the design of these devices difficult. Disclosed are techniques which decrease the amount of offset voltage which provide predictability of device parameters over a range of temperatures.