Abstract: A biopotential monitoring device and use of such device. The device includes a configurable receiver circuit having a plurality of channels for receiving a plurality of biopotential signals from a biological tissue via a plurality of inputs coupled with the electrodes, and each channel substantially removes a DC (direct current) offset from a corresponding one of the biopotential signals and then band-pass amplifies such corresponding biopotential signal at a configurable gain and particular frequency range based on frequency control signals. The device further includes a controller circuit for receiving commands for configuring frequency characteristics of each biopotential signal. The controller automatically generates the frequency control signals based on such commands and outputs such frequency control signals to the configurable receiver circuit. The controller outputs a representation of each biopotential signal to an analyzer device that is configured to analyze such biopotential signal.

Abstract: A biopotential monitoring device and use of such device. The device includes a configurable receiver circuit having a plurality of channels for receiving a plurality of biopotential signals from a biological tissue via a plurality of inputs coupled with the electrodes, and each channel substantially removes a DC (direct current) offset from a corresponding one of the biopotential signals and then band-pass amplifies such corresponding biopotential signal at a configurable gain and particular frequency range based on frequency control signals. The device further includes a controller circuit for receiving commands for configuring frequency characteristics of each biopotential signal. The controller automatically generates the frequency control signals based on such commands and outputs such frequency control signals to the configurable receiver circuit. The controller outputs a representation of each biopotential signal to an analyzer device that is configured to analyze such biopotential signal.

Abstract: A biopotential monitoring device includes a configurable receiver circuit having a plurality of channels for receiving a plurality of biopotential signals from a biological tissue via a plurality of inputs coupled with the electrodes, and each channel substantially removes a DC (direct current) offset from a corresponding one of the biopotential signals and then band-pass amplifies such corresponding biopotential signal at a configurable gain and particular frequency range based on frequency control signals. The device further includes a controller circuit for receiving commands for configuring frequency characteristics of each biopotential signal. The controller automatically generates the frequency control signals based on such commands and outputs such frequency control signals to the configurable receiver circuit. The controller outputs a representation of each biopotential signal to an analyzer device that is configured to analyze such biopotential signal.

Abstract: Disclosed are systems, apparatus, and methods for sensing currents conducted via an electrode. In various embodiments, an apparatus may include an operational amplifier including a first input terminal, a second input terminal, and an output terminal. The first input terminal may be configured to electrically couple with the electrode. The apparatus may further include a feedback circuit coupling the output terminal of the operational amplifier to the first input terminal. The feedback circuit may comprise a plurality of transistor devices configured to generate a feedback current based on a voltage value of the output terminal. The plurality of transistors may be further configured to provide the feedback current to the first input terminal. The apparatus may also include a voltage source coupled to the second input terminal and configured to maintain a substantially constant voltage at the second input terminal.

Abstract: An in-vivo implantable coil assembly includes a planar coil having at least one coil layer formed from conductive traces disposed in or on a polymer matrix. A ferrite platelet is bonded to a surface of the polymer matrix. Methods of making and using the in-vivo implantable coil assembly are also disclosed.

Abstract: Devices and methods for amplifying weak electric signals are described. The device of the invention includes an amplifier that is fully integrated in a standard CMOS process and is capable of rejecting large DC offsets while amplifying signals down to the sub-Hz range. This result is achieved by using single-transistor MOS “pseudo-resistor” elements to achieve a very low cutoff frequency in the mHz range or lower. When combined with an electrode array or other sensor array, the fully-integrated amplifier is suitable for recording biological and biopotential signals from the mhz range up to and including about 7 kHz. The amplifier also rejects dc offsets at the input and offers a superior power-noise tradeoff than other amplifiers currently available.