A microelectromechanical gyroscope which comprises one or more Coriolis masses driven by a drive transducer and a force-feedback system. The force-feedback circuit comprises first and second sideband modulators and the self-test circuit comprises first and second sideband demodulators.

A transmitter for generating a radio frequency, RF, transmit signal is provided. The transmitter includes signal generation circuitry configured to generate, based on a sequence of first control words each indicating a respective frequency shift with respect to a target frequency of the RF transmit signal, a RF carrier signal with sequentially varying frequency over time in order to frequency spread the RF transmit signal. Further, the transmitter includes modulation circuitry configured to generate the RF transmit signal by modulating the RF carrier signal with a modulation control signal. The transmitter additionally includes modification circuitry configured to generate the modulation control signal by modifying, based on the sequence of first control words, phase information of a baseband signal bearing information to be transmitted or phase information of a signal derived from the baseband signal in order to frequency de-spread the RF transmit signal.

A radio-frequency integrated circuit (RFIC) configured to generate a synthesized clock includes a phase locked loop (PLL) configured to divide down a clock to a non-harmonic frequency; a plurality of multi-phase injection locked clock multipliers (ILCM) directly connected to a plurality of transceiver chains; wherein the PLL is further configured to distribute a divided down clock to at least one of the plurality of multi-phase ILCMs; wherein the plurality of multiphase ILCMs are configured to select a phase of and multiply the divided down clock to synthesize a desired harmonic frequency of the clock and suppress an undesired harmonic frequency of the clock.

The disclosed embodiments relate to the design of a system that implements an up-conversion mixer. This system includes a regulator-based linearized transconductance (g.sub.m) stage, which converts a differential intermediate frequency (IF) voltage signal into a corresponding pair of IF currents. It also includes a pair of current mirrors, which duplicates the pair of IF currents into sources of a set of switching transistors. The set of switching transistors uses a differential local oscillator (LO) signal to gate the duplicated pair of IF currents to produce a differential radio frequency (RF) output signal. Finally, a combination of capacitors and/or inductors is coupled to common source nodes of the set of switching transistors to suppress higher order harmonics in an associated common source node voltage signal.

A system for linearized-mixer interference mitigation includes first and second linearized frequency downconverters; a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled BB transmit signal to generate a cleaned BB transmit signal; an analog interference canceller that transforms the cleaned BB transmit signal to a BB interference cancellation signal; and a first signal coupler that combines the BB interference cancellation signal and the BB receive signal in order to remove a first portion of receive-band interference.

A pair of programmable state machines may be included in a transmitter integrated circuit of a scanner (e.g. a body scanner) to control the sub-circuits of the transmitter integrated circuit. The first programmable state machine may be used to control the signal processor of the transmitter that facilitates generation of a signal to be transmitted at a target, such as a user to be scanned. The second programmable state machine may be used to control the transmitter's selection of a transmission channel for transmitting the signal in which provides the signal to be transmitted to an antenna. Further, the receiver integrated circuit of the scanner may include a similar pair of programmable state machines for controlling the receive signal processor and receiver of the receiver integrated circuit. The inclusion of the state machines can reduce both the scan time and the circuit complexity of the scanner.

A transmitter having: an oscillator to generate a clock signal and synthesize frequencies for modulating a message to generate first signals to a first direct current power line, and a control circuit to adjust timing of the first signals in synchronization with second signals transmitted in a second direct current power line disposed in a vicinity of the first direct current power line, by synchronizing phase of the first and second signals or by transmitting the first and the second signals in separate time windows.

A millimeter wave signal transmission integration device includes an antenna array module, a flexible substrate, a coaxial cable and a signal processing module. The antenna array module is used to transmit and receive millimeter wave signals, and convert millimeter wave signals to intermediate frequency (IF) signals or convert IF signals to millimeter wave signals. The flexible substrate is connected to the antenna array module, and is used to transmit/receive IF signals. The coaxial cable is connected to the flexible substrate and is used to transmit and receive IF signals. The signal processing module is connected to the coaxial cable and is used to transmit and receive IF signals. With the above configuration, the present invention achieves the effects of reduced occupied space of the millimeter wave signal transmission module and reduced attenuation of IF signals.

Systems and methods for reducing reflected towards a higher frequency radio frequency (RF) generator during a period of a lower frequency RF generator and for using a relationship to reduce reflected power are described. By tuning the higher frequency RF generator during the period of the lower frequency RF generator, precise control of the higher frequency RF generator is achieved for reducing power reflected towards the higher frequency RF generator. Moreover, by using the relationship to reduce the reflected power, time is saved during processing of a wafer.

A communication system using adaptive sample rate reduction (ASRR) is disclosed. The system includes a digital front end (DFE) and a radio frequency (RF) interface. The DFE is configured to receive a baseband signal, identify reduced performance parameters for the baseband signal, reduce a sampling rate for the baseband signal based on the reduced performance parameters and generate a digital interface signal using the reduced sampling rate. The RF interface is configured to generate an analog TX signal from the digital interface signal.