Disclosed herein are transconductance circuits, as well as related methods and devices. In some embodiments, a transconductance circuit may include an amplifier having a first input coupled to a voltage input of the transconductance circuit, and a switch coupled between an output of the amplifier and a second input of the amplifier.

An assembly of electronic components for reception of data using an optical fibre wherein said assembly comprises: a photodiode; a first amplifier coupled to said photodiode; a second amplifier, whose electrical behaviour is substantially identical to an electrical behaviour of said first amplifier; an impedance network comprising at least two electronic components coupled between an input of said second amplifier and a reference terminal, wherein those at least two electronic components comprise at least two impedance elements, one impedance element being capacitive and another being resistive or inductive, and wherein said at least two electronic components are adjustable under electronic control to adjust the impedance presented by said impedance network; and circuitry for creating a signal formed from a subtraction of outputs of the first and second amplifiers.

An amplifier includes an amplifying device and a bias circuit for providing a bias voltage for the amplifying device. The bias circuit is configured to provide the bias voltage in dependence of an output signal of an optical coupling arrangement which provides for electrical isolation.

A system for optical data interconnect of a source and a sink includes a first HDMI compatible electrical connector able to receive electrical signals from the source. A first signal converter is connected to the first HDMI compatible electrical connector and includes electronics for conversion of TMDS or FRL electrical signals to optical signals, with the electronics including an optical conversion device. At least one optical fiber is connected to the first signal converter. A second signal converter is connected to the at least one optical fiber and includes electronics for conversion of optical signals to differential electrical signals. A power module for the second signal converter includes a power tap connected to TMDS or FRL circuitry and a first voltage regulator connected to the power tap to provide power to an electrical signal amplifier. A rechargeable battery module is used to trigger power activation of connected ports, with the battery module being connected to the power tap. A second HDMI compatible electrical connector is connected to the second signal converter and able to send signals to the sink.

A digital isolator device which includes a first input buffer configured to receive a first differential signal from a transmitter and to provide a second differential signal, the first differential signal being characterized by a first magnitude, the second differential signal being characterized by a second magnitude, the first magnitude being greater than the second magnitude. The device also includes a second input buffer configured to receive a third differential signal from the transmitter and to provide a fourth differential signal, the second input buffer being coupled to the second ground terminal. The device also includes a common-mode circuit coupled to the second differential signal and the fourth differential signal, the common-mode circuit being configured to reduce a common-mode transient voltage, the common-mode transient voltage being associated with a voltage differential between the first ground terminal and the second ground terminal.

Disclosed herein are transconductance circuits, as well as related methods and devices. In some embodiments, a transconductance circuit may include an amplifier having a first input coupled to a voltage input of the transconductance circuit, and a switch coupled between an output of the amplifier and a second input of the amplifier.

Isolators and methods for operating the same are described for opto-isolators with improved common mode transient immunity (CMTI). In some embodiments, a pair of photodetectors are provided in the opto-isolator and configured to generate photocurrents of opposite signs or directions in response to a light signal. Photocurrents from the pair of photodetectors are combined in a differential manner to represent data transmitted in a light signal, while common mode transient noise at the two photodetectors is attenuated or eliminated.

An optical receiver can implement a transimpedance amplifier (TIA) to process received light using a closed loop optical pre-amplification. The optical receiver can use an average input value of the TIA to control an semiconductor optical amplifier (SOA) or pre-amplification as received average signal varies. The optical receiver can include a gain controller for the TIA that can measure the TIA swing to adjust the gain of the SOA to pre-amplify received light in a closed loop control configuration.

Disclosed herein are transconductance circuits, as well as related methods and devices. In some embodiments, a transconductance circuit may include an amplifier having a first input coupled to a voltage input of the transconductance circuit, and a switch coupled between an output of the amplifier and a second input of the amplifier.

A digital isolator comprising a set of bipolar transistors and an inductor capacitor (LC) oscillator coupled to the set of bipolar transistors in series, wherein the LC oscillator is configured to be turned on and off based on the current applied to the set of bipolar transistors or the LC oscillator and generate a set of differential signals based on the current flowing through the set of bipolar transistors and mimicking the operational characteristics of an optocoupler.