A RF control circuit is provided and includes a controller, a divider, and a RF sensor. The controller selects a RF, which is a frequency of a reference LO signal. The divider receives a first RF signal detected in a substrate processing chamber and outputs a second RF signal. The first RF signal is generated by a RF generator and supplied to the substrate processing chamber. The RF sensor includes a lock-in amplifier, which includes: a RF path that receives the second RF signal; a LO path that receives the reference LO signal; a first mixer that generates an IF signal based on the second RF signal and the reference LO signal; and a filter that filters the IF signal. The controller generates a control signal based on the filtered IF signal and transmits the control signal to the RF generator to adjust the first RF signal.

A RF control circuit is provided and includes a controller, a divider, and a RF sensor. The controller selects a RF, which is a frequency of a reference LO signal. The divider receives a first RF signal detected in a substrate processing chamber and outputs a second RF signal. The first RF signal is generated by a RF generator and supplied to the substrate processing chamber. The RF sensor includes a lock-in amplifier, which includes: a RF path that receives the second RF signal; a LO path that receives the reference LO signal; a first mixer that generates an IF signal based on the second RF signal and the reference LO signal; and a filter that filters the IF signal. The controller generates a control signal based on the filtered IF signal and transmits the control signal to the RF generator to adjust the first RF signal.

A radio-frequency front-end circuit includes first and second filters, and first and second band elimination filters. The first filter is connected between an antenna common terminal and a first input-output terminal, and has a first frequency band as a pass band. The second filter is connected between the antenna common terminal and a second input-output terminal, and has a second frequency band as a pass band. The first band elimination filter is connected between the antenna common terminal and a third input-output terminal, and has the first frequency band as a stop band. The second band elimination filter is connected in series with the first band elimination filter between the antenna common terminal and the third input-output terminal, and has the second frequency band as a stop band.

The communication receiver comprises a mixer being configured to mix the communication signal with a periodic mixing signal having a mixing frequency f.sub.C to obtain a mixed communication signal, wherein the mixed communication signal comprises a first frequency spectrum portion comprising the spectral region of interest being situated around a frequency f.sub.RF+f.sub.C and a second frequency spectrum portion comprising the spectral range of interest being situated around f.sub.RFf.sub.C; a first demodulator being configured to demodulate a first frequency channel of the plurality of frequency channels within the spectral range of interest of the first frequency spectrum portion on the basis of a first local oscillator frequency f.sub.LO1; and a second demodulator being configured to demodulate a second frequency channel of the plurality of frequency channels within the spectral region of interest of the second frequency spectrum portion on the basis of a second local oscillator frequency f.sub.LO2.

A radio frequency (RF) amplifier assembly includes modular amplification and processing units, which can be easily installed or replaced in the housing of the RF amplifier assembly, e.g., in response to changing needs and/or changing capabilities in the cable network communications system. The RF amplifier housing facilitates, e.g., via slots with connectors, accepting and coupling of alternative modular units, which can be installed/removed. The RF amplifier assembly includes a first spectrum (e.g., legacy spectrum) amplification and processing circuit, supporting both upstream and downstream signaling. The RF amplification assembly further includes one or more optional additional (extended) spectrum amplification and processing circuits, which are removeable modular units, and which support downstream signaling over extended spectrum. The RF amplifier assembly further includes spectrum splitter/combiner circuits, e.g., implemented in some embodiments using a diplexer-less design, for splitting/combining spectrum blocks with regard to multiple amplification and processing circuits installed within the RF amplifier assembly.

A device comprises a digital ramp generator, an oscillator, a power amplifier, a low-noise amplifier (LNA), a mixer, and an intermediate frequency amplifier (IFA). The oscillator generates a chirp signal based on an output from the digital ramp generator. The power amplifier receives the chirp signal and outputs an amplified chirp signal to a transmitter antenna. The LNA receives a reflected chirp signal from a receiver antenna. The mixer receives output of the LNA and combines it with the chirp signal from the oscillator. The IFA receives the mixer output signal and includes a configurable high-pass filter, which has a first cutoff frequency during a first portion of the chirp signal and a second cutoff frequency during a second portion of the chirp signal. In some implementations, the first cutoff frequency is chosen based on a frequency of a blocker signal introduced by couplings between the transmitter and receiver antennas.

Embodiments of this application provide a wireless communication system and an electronic device. A first high-frequency integrated circuit in the wireless communication system includes a high-frequency control unit, a first diplexer, and a second diplexer. An intermediate-frequency integrated circuit includes an intermediate-frequency control unit, a third diplexer, and a fourth diplexer. A control signal is transmitted between the high-frequency control unit and the intermediate-frequency control unit. The control signal includes an instruction data signal and an echo clock signal. A phase of the instruction data signal is synchronized with a phase of the echo clock signal, and a frequency of the instruction data signal and a frequency of the echo clock signal are in a co-frequency relationship or a frequency multiplication relationship.

A method for transmitting a message from a first node device to a second node device in which the second node device belongs to network neighborhood of the first node device. The first and second node devices belong to an electrical supply network using powerline communications. The first node device begins by fragmenting the message into at least a first fragment and a second fragment. Next it associates a first frequency band of a set of frequency bands with the first fragment and a second frequency band with the second fragment, the first and second frequency bands being different. It then transmits each first and second fragment on the frequency band with which it is associated.

Apparatuses and methods for simultaneously operating as a wireless radio and monitoring the local frequency spectrum. For example, described herein are wireless radio devices that use a secondary receiver to monitor frequencies within the operating band and prevent or avoid interferers, including in particular half-IF interferers. The systems, devices, and methods described herein may adjust the intermediate frequency in a superheterodyne receiver to select an intermediate frequency that minimizes interference. In particular, described herein are apparatuses and methods that use a second receiver which is independent of the first receiver and may be connected to the same receiving antenna to monitor the geographically local frequency spectrum and may detect spurious interferers, allowing the primary receiver to adjust the intermediate frequency and avoid spurious interferes.

A fixed wireless access network provides for high-frequency data links between aggregation nodes and endpoint nodes. The system further provides for lower frequency wireless data links, which have carrier frequencies less than high-frequency wireless data links. These lower frequency links provide for auxiliary communications between the aggregation nodes and one or more endpoint nodes. During normal operation, the nodes exchange packet data via the high-frequency data links. However, when impairment of the high-frequency data links is detected, the nodes direct the packet data over the low-frequency data links instead until the high-frequency data links are no longer impaired.