Panasonic Corporation

Silicon Laboratories Inc.

Panasonic Intellectual Property Management Co., Ltd.

Tufts University

The Trustees of Boston College

Saroj Rout

Akhil K Garlapati

Ronald Joseph Lipka

Qicheng Yu

Timothy Joseph Dupuis

Marius Goldenberg

Sameer Sonkusale

Li Gao

Willie John Padilla

Kim Fung Lee

An electronic circuit for a micro-electro-mechanical systems gyroscope is disclosed. The electronic circuit includes a current buffer, a transimpedance amplifier coupled with the current buffer, and a plurality of transistors. An inverting input terminal of the current buffer and a non-inverting input terminal of the current buffer are connected with a plurality of first resistors. The inverting input terminal of the current buffer is connected with a source of one of the plurality of transistors, and the non-inverting input terminal of the current buffer is connected with a source of another one of the plurality of transistors. The plurality of first resistors are connected to a ground. The current buffer is configured to isolate a load in the micro-electro-mechanical systems gyroscope from the transimpedance amplifier.

Trans impedance amplifier capacitance isolation stage

A sense channel signal processing block is time-domain multiplexed among multiple MEMS devices and utilizes an anti-aliasing filter disposed after track-and-hold switches, to prevent the bandwidth of the sense channel from being limited by the anti-aliasing filter. A multiplexed signal processor architecture performs dynamic calibration of all sensor error signals in response to environmental changes.

Method for calibration of a system with time-multiplexed sensors

A quadrature error signal cancellation circuit and technique can detect an undesired quadrature signal component in the output of a MEMS gyroscope and null the quadrature signal component. In one embodiment, the cancellation circuit is configured in a feedback loop with the MEMS gyroscope and includes components to detect and condition the quadrature signal, digitize the conditioned quadrature signal, and generate a quadrature error cancellation signal which is provided back to the MEMS gyroscope.

Method and system for detecting and correcting quadrature error signals for MEMS device

A sense channel signal processing block is time-domain multiplexed among multiple MEMS devices and utilizes an anti-aliasing filter disposed after track-and-hold switches, to prevent the bandwidth of the sense channel from being limited by the anti-aliasing filter.

Time-domain multiplexed signal processing block and method for use with multiple MEMS devices

An apparatus for controlling propagation of an electromagnetic wave includes a metamaterial having an array of cells, each cell containing a metallic structure having a resonant frequency; a plurality of devices integrated in the metamaterial, each of said devices being in electrical communication with a metallic structure in a cell in the array of cells; and a controller for electrically activating each of said plurality of devices to cause said resonant frequency to change, thereby causing at least one of a permeability and permittivity of the metamaterial to change.

Active manipulation of electromagnetic wave propagation in metamaterials

A radio frequency (RF) signal is attenuated using first () and second () attenuation elements. In one embodiment an initial overall attenuation of the RF signal is set using both the first () and second () attenuation elements during a calibration period. The initial overall attenuation of the RF signal is adjusted using only the first attenuation element during a normal operation period. In another embodiment the initial overall attenuation is determined and is provided using either, only the first attenuation element () or both the first attenuation element () and the second attenuation element () based on a value of the initial overall attenuation.

Television reciever with automatic gain control (AGC)

DC holding circuitry that may be implemented with other parts of a DAA circuit to terminate a telephone connections at the user's end. The DC holding circuitry may be implemented using a synthesized inductor circuit powered by DC termination circuitry of a DAA telephone line circuit to provide quiet current that may be mirrored to provide the DC holding. The DC holding circuitry may be further implemented to actively steer DC holding current into multiple external transistors to share the power burden, and using an op-amp gain/feedback configuration to achieve low noise and distortion without the need for expensive capacitor-based filter and high powered transistor components. Variable biasing and active current steering may be employed to permit one or more external resistor/s to help dissipate power. The disclosed DC holding circuitry may also be implemented with a fast transient network having a single stage of fast transient filtering placed in the input network. A fast off-hook settling circuit block may also be implemented to achieve fast settling times by using an op-amp to clamp the receive pin voltage of a DAA circuit.

DC holding circuit

An apparatus for interfacing an integrated circuit with external circuitry includes a transistor having an emitter coupled to a node for receiving a control current (IP) from the integrated circuit. A beta compensator disposed within the integrated circuit provides a compensating current (IM) to the node. The compensating current IM is proportional to a base current (IB) of the transistor. A method of interfacing the integrated circuit with external circuitry includes the step of providing the control current (IP) from the integrated circuit to a node coupled to a transistor emitter. A compensating current (IM) is provided to the node in response to the transistor base current (IB). The net node current provided to the emitter is IP&plus;IB so that the transistor collector current is substantially the same as the control current. The transistor collector is coupled to the external circuitry.

Growing community of inventors

Nashua, NH, United States of America

Saroj Rout