A coupling module can be used to communicate high speed signals between an optical transceiver and a processing module of an optical communication device, such as an optical line termination (OLT) or an optical network unit (ONU). The coupling module can adjust the common mode voltage level of a differential signal output by the optical transceiver to the common mode voltage level required by the processing module. In addition, the coupling module splits each of the differential output signals from the optical transceiver and passes the split signals to both a high-pass filter and a low-pass filter that are connected in parallel. An adapter module can be connected to the coupling module such that the coupling module can receive different differential signals from different optical transceivers.

The present invention relates to an electronic device, comprising: —a GFET; —noise suppression means comprising: —a modulation unit applying to a gate (G) of the GFET a signal V.sub.g with frequency f.sub.m to modulate charge carrier density of a graphene channel around the charge neutrality point between charge carrier density values at frequency f.sub.m, —a control unit (CU), and —a demodulation circuit which is CMOS-implemented and that: —comprises first and second circuital branches alternately switchable to demodulate an electrical signal of frequency f.sub.m; or —is configured to generate and apply a signal V.sub.b with frequency f.sub.mb to a source (S) of the GFET continuously, simultaneously and with a delay t.sub.d to induce a phase with respect to V.sub.g to yield a maximal demodulated output signal (So). The present invention also concerns to a method for suppressing noise for the device of the invention.

The present invention relates to an electronic device, comprising: —a GFET; —noise suppression means comprising: —a modulation unit applying to a gate (G) of the GFET a signal V.sub.g with frequency f.sub.m to modulate charge carrier density of a graphene channel around the charge neutrality point between charge carrier density values at frequency f.sub.m, —a control unit (CU), and—a demodulation circuit which is CMOS-implemented and that: —comprises first and second circuital branches alternately switchable to demodulate an electrical signal of frequency f.sub.m; or—is configured to generate and apply a signal V.sub.b with frequency f.sub.mb to a source (S) of the GFET continuously, simultaneously and with a delay t.sub.d to induce a phase with respect to V.sub.g to yield a maximal demodulated output signal (So). The present invention also concerns to a method for suppressing noise for the device of the invention.

According to at least one aspect, a filter network is provided. The filter network comprises: an active filter comprising an amplifier (e.g., an operational amplifier), wherein the active filter is configured to add at least one member selected from the group consisting of a pole and a zero to a transfer function of the filter network; a passive filter coupled to the active filter and configured to add at least one pole to the transfer function of the filter network; and a non-inverting amplifier (e.g., a voltage buffer) having an input coupled to the passive filter and an output coupled to the active filter.

A circuit includes a filter, a first inverter, and a second inverter. The filter is coupled to an input of the first inverter. The second inverter includes an input and an output. The input of the second inverter is coupled to the output of the first inverter. The output of the second inverter is coupled to the input of the first inverter.

An aspect includes a filtering method including operating a first filter to filter a first input signal to generate a first output signal; operating a second filter to filter a second input signal to generate a second output signal; and selectively coupling at least a portion of the second filter with the first filter to filter a third input signal to generate a third output signal. Another aspect includes a filtering method including operating switching devices to configure a filter with a first set of pole(s); filtering a first input signal to generate a first output signal with the filter configured with the first set of pole(s); operating the switching devices to configure the filter with a second set of poles; and filtering a second input signal to generate a second output signal with the filter configured with the second set of poles.

A tunable filter is described where the frequency response as well as bandwidth and transmission loss characteristics can be dynamically altered, providing improved performance for transceiver front-end tuning applications. The rate of roll-off of the frequency response can be adjusted to improve performance when used in duplexer applications. The tunable filter topology is applicable for both transmit and receive circuits. A method is described where the filter characteristics are adjusted to account for and compensate for the frequency response of the antenna used in a communication system.

A coupling module can be used to communicate high speed signals between an optical transceiver and a processing module of an optical communication device, such as an optical line termination (OLT) or an optical network unit (ONU). The coupling module can adjust the common mode voltage level of a differential signal output by the optical transceiver to the common mode voltage level required by the processing module. In addition, the coupling module splits each of the differential output signals from the optical transceiver and passes the split signals to both a high-pass filter and a low-pass filter that are connected in parallel. An adapter module can be connected to the coupling module such that the coupling module can receive different differential signals from different optical transceivers.

A circuit includes a filter, a first inverter, and a second inverter. The filter is coupled to an input of the first inverter. The second inverter includes an input and an output. The input of the second inverter is coupled to the output of the first inverter. The output of the second inverter is coupled to the input of the first inverter.

A hybrid filter circuit for reducing common-mode interference signals with frequencies of at least 150 kHz in a power line with at least one phase. The circuit has a passive filter stage and an active filter unit with an active filter stage. The circuit can be coupled to an electrical device on a load side and to a power supply system on a supply side via the power line. The first active filter stage includes a sensor for measuring a common mode noise signal in the power line and a feedback unit with an active amplifier unit for generating a compensation signal counteracting the common mode noise signal, which is coupled into the power line via an output of the first active filter stage. The passive filter stage and the active filter circuit are arranged in cascade between the load terminal and a supply terminal.