Applied Micro Circuits Corporation

Medtronic, Inc.

Todd M Tanji

John J Stronczer

James D Reinke

Can Cinbis

James R Welch

An optical transceiver system includes circuitry including a light-emitting device, a driver for the light-emitting device being coupled to the light-emitting device for providing activating power to said light-emitting device and an optical detector disposed to receive light emitted from the light-emitting device, said circuitry being substantially constructed using CMOS technology. A calibration interface is coupled to the circuitry for automatically executing an iterative cycle for a calibration of optical link parameters. And, an optical loop-back is included for optically coupling the light-emitting device and the optical detector, the optical detector receiving light emitted by the light-emitting device, the light emission being selectively stimulated by the calibration interface, the received light emission being communicated to the calibration interface for comparison with a known light signal. A method of automatic calibration and control of optical link parameters in a VCSEL-based optical transceiver is included.

Methods and systems for control and calibration of VCSEL-based optical transceivers

The multiple-channel clock and data recovery scheme of the present invention derives a single clock signal from multiple mis-matched data streams. The single clock is phased to provide a clocking signal such that the data sampler of the clock and data recovery scheme performs bit center sampling of the data at the bit center average of all channels. The phase of the recovery clock is the average of all the data stream phases, and is the optimal sampling phase for minimum combined bit error rate of all the channels.

Clock and data recovery scheme for multi-channel data communications receivers

A transimpedance amplifier according to the present invention is designed for high-speed fiber optic communications. The transimpedance amplifier preferably includes an input stage, a second stage and a bias generator. The input stage is operably coupled to the second stage and has an input impedance. The second stage has an output impedance. The bias generator is operably coupled to the input stage and the second stage, and operates to bias the input stage and second stage such that the input impedance substantially matches the output impedance. In this manner, the input and output impedances of a transimpedance amplifier of a fiber optics communication receiver are controllable to a desired impedance for interfacing with a transmission line.

Impedance matched CMOS transimpedance amplifier for high-speed fiber optic communications

The VGA according to the present invention generally includes a first gain cell, a second gain cell that is operably connected to the first gain cell, and a current control circuit portion that is operably connected to the first and second gain cells. The first gain cell has a transconductance and preferably comprises a pair of MOSFETs. The second gain cell has a transconductance and also preferably comprises a pair of MOSFETs. The first and second gain cells receive an input signal and produce an output signal that is amplified in proportion to their transconductance. The current control circuit portion controls the amount of current sent to the first and second gain cells and, as such, also controls their transconductance. Note that the transconductance of the first gain cell is designed to be larger by a predetermined amount than the transconductance of the second gain cell for a given amount of current.

Radio frequency variable gain amplifier fabricated in complementary metal oxide semiconductor technology

The low noise amplifier (LNA) of the present invention comprises an input stage including an input inductor and an input circuit portion. The input circuit portion is operably connected to the input inductor and includes an input gain portion. The LNA further comprises an output stage that is operably connected to the input stage. The output stage includes an output inductor and an output circuit portion. The output circuit portion is operably connected to the output inductor and includes an output gain portion. The input and output inductors are distinct, off-chip components. However, the input circuit portion and output circuit portion are fabricated on a single, integrated circuit chip with CMOS technology. The input stage includes an input impedance that is matched to a system impedance while the output stage includes an output impedance that is matched to a system impedance.

Radio frequency low noise amplifier fabricated in complementary metal oxide semiconductor technology

Impedance matched CMOS transimpedance amplifier for high-speed fiber

Method and apparatus for detection of non-physiologic senses checks the output of the sense amplifier of an implanted medical device where the inputs of the sense amplifier are adapted to connect to a living body for sensing electrical signals representative of physiologic events, and especially heart beats, and if that sense output senses a physiologic event within a predetermined time after a non-physiologic event is sensed by another circuit also connected to receive electrical signals from said living body, then there is reported out a signal indicating that the event sensed by the sense amplifier is of a non-physiologic nature. Various uses are accomplished with the information in these output signals.

Non-physiologic sense detection for implantable medical devices

A circuit for determining lead impedance during the time a pacing or other stimulating electrical pulse is being delivered measures current and voltage simultaneously to check for open circuits or short circuits based on different thresholds. The detection of a bad lead can force a double pulse to be delivered in real time in a unipolar configuration. Switching from unipolar to bipolar configuration based on detecting a bad bipolar circuit can be supported.

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Egan, MN, United States of America

Todd M Tanji