Abstract: A motor driving device includes an OPEN driving mode in which a driving waveform is generated without using detection information of a rotational position of a rotor and the rotor is rotated, and a CLOSE driving mode in which a phase of a rotational position and a phase of a driving waveform are synchronized using the detection information of the rotational position of the rotor, a desired phase difference is set between the rotational position and the driving waveform, and the rotor is rotated. The CPU controls rotation of the rotor using the OPEN driving mode, instructs a driving waveform generating circuit to set a phase difference for generating a torque in a reversing direction when rotation of the rotor is reversed, switches to the CLOSE driving mode, and then switches to the OPEN driving mode again when reversing has been completed.

Abstract: A frequency converter receives a predetermined input signal and a predetermined local oscillation signal, and outputs a signal obtained by mixing the input signal with a harmonic signal having a frequency n times the frequency of the local oscillation signal, wherein a circuit that mixes the input signal with the harmonic signal is a harmonic mixer, which mixes the harmonic signal with the input signal using a nonlinear characteristic of a semiconductor element, and wherein the input signal or the output signal is subjected, either before input to the frequency converter or after output from the frequency converter, to correction on the basis of the amplitude and phase frequency characteristics of the frequency converter, which have been determined in advance.

Abstract: A test method and system are provided for testing a switched mode power supply in open loop on an automated test equipment device by applying a low frequency waveform signal (209) to a compensator filter (225) and simultaneously capturing and processing the input (223) and output (222) to the compensator filter (225) to determine the phase difference therebetween.

Abstract: A measurement circuit includes a phase detection circuit and delay circuitry. The phase detection circuit compares a first signal to a second signal to generate a first phase difference when the delay circuitry generates the second signal based on the first signal. The phase detection circuit compares the first signal to the second signal to generate a second phase difference when the delay circuitry generates the second signal based on a third signal provided to a signal network. The measurement circuit determines a delay of the signal network based on the first and second phase differences.

Abstract: Systems and other embodiments associated with synthetic instrumentation are presented. A reconfigurable synthetic instrumentation unit comprises an input module, with dual input/output ports and conditioning logic to condition an input signal. An RF down converter selectively down converts the conditioned input signal. A sampled RF down converter selectively samples the conditioned input signal. A pair of narrowband A/D converters are configured to convert one of the conditioned signal, the down converted signal and the sampled signal to produce a narrowband digital signal. A pair of broadband A/D converters convert at least one of the conditioned signal, the down converted signal and the sampled signal to produce a broadband digital signal. Signal processing logic selectively performs digital signal processing on the broadband digital signal or the narrow band digital signal.

Abstract: A receiver for analyzing input RF signals includes a first stage that includes an input for receiving one or more RF signals for analysis and a first local oscillator having an output including a first plurality of frequencies. The input is mixed with the local oscillator output in a first mixer to generate a first intermediate frequency spectrum output. A second stage includes a second local oscillator adapted to produce as output a sweep signal traversing a second plurality of frequencies and a second mixer for combining the second local oscillator output with the first intermediate frequency output to generate a second intermediate frequency output.

Abstract: A portable telephone radio unit is disclosed which allows a user to recognize an incomplete state of data communication which occurs with a terminal equipment because of deterioration of the communication state by radio wave interference upon channel changing over in the course of a standby channel selection operation or during communication. A signal processing section performs information analysis of a signal selected by a control circuit section from among reception signals of an antenna whose levels are measured by a radio circuit section upon channel changing over in the course of a standby channel selection operation or during communication. The control circuit section detects loss of frame synchronization, deterioration in bit error rate, unfavorable reception of broadcast information or interruption of radio waves which is a condition of radio wave interference.

Abstract: In a circuit arrangement and method for testing a radio receiving system, the circuit arrangement includes multiple antennas, an antenna selector switch for the antennas, a receiver, and a diversity processor that controls the antenna selector switch. A diagnostic processor has an output terminal connected to a control input of the diversity processor, which provides at its output terminal, a signal that prevents the diversity processor from performing any further switching operations.

Abstract: An upstream channel overload detection circuit for a CDMA (Code Division Multiple Access) mobile communication system includes a reception electric field measurement section, noise level storage section, threshold storage section, and comparing section. The reception electric field measurement section detects the electric field strength levels of reception signals from a plurality of mobile terminals. The noise level storage section stores an output from the reception electric field measurement section as a noise level when there is no transmission power of the plurality of mobile terminals. The threshold storage section stores, as a threshold level, an output from the reception electric field measurement section which corresponds to an allowable number of transmissions from the plurality of mobile terminals.

Abstract: Power measuring receiver (PMR) methods and apparatus for measuring power of signals are provided in which a high frequency measuring circuit (HFMC), a conversion measuring circuit (CMC), and an intermediate frequency measuring circuit (IFMC) work in conjunction with each other to measure a wide power range of signals. The HFMC may measure relatively high power signals at high frequency. The CMC may convert the high frequency signal into an intermediate frequency signal so that both the CMC and the IFMC can accurately measure low power signals. The CMC may also set the minimum noise bandwidth associated with gain stages in the IFMC. The intermediate frequency may provide the IFMC with the ability to perform low power measurements at a reduced DC power consumption.

Abstract: Reference frequency spur cancellation in a synthesized measurement receiver is achieved by determining for any given frequency to which the receiver is tuned a list of integer multipliers of the reference frequency that produce spurious signals in the receiver's passband. For those values the amplitude and phase for each spurious signal is determined in the digital domain and subtracted from the digital signal from the receiver. The reference frequency is then offset slightly and the measurement repeated. The maximum values between each measurement are combined to produce a measurement for the input signal without spurious signals.

Abstract: An upstream channel overload detection circuit for a CDMA (Code Division Multiple Access) mobile communication system includes a reception electric field measurement section, noise level storage section, threshold storage section, and comparing section. The reception electric field measurement section detects the electric field strength levels of reception signals from a plurality of mobile terminals. The noise level storage section stores an output from the reception electric field measurement section as a noise level when there is no transmission power of the plurality of mobile terminals. The threshold storage section stores, as a threshold level, an output from the reception electric field measurement section which corresponds to an allowable number of transmissions from the plurality of mobile terminals.

Abstract: In a method for measuring the receiver sensitivity of communication devices provided for operation in a digital communication net, wherein the fulfillment of a first criterion is tested at a pre-determined data transmission rate and at a pre-determined reception level, a substantial increase of the testing speed is realized by conducting the testing at a higher data transmission rate than the pre-determined data transmission rate at the pre-determined reception level, wherein the fulfillment of a second criterion is tested, and wherein the second criterion is determined from the first criterion.

Abstract: The present invention relates to an electro-optic sampling oscilloscope. This electro-optic sampling oscilloscope carries out measurement of measured signal by using an optical pulse generated based on a timing signal generated from a timing generation circuit synchronous with a trigger signal, providing: a timing generation circuit comprising a fast ramp circuit that outputs a ramp waveform using said trigger signal as a trigger, a slow ramp circuit that increases stepwise and sequentially the output value according to said timing signal; a comparator circuit that compares the output of said fast ramp circuit and the output of said slow ramp circuit and outputs the results of this comparison; and a gate circuit that limits the output of said comparator circuit by closing a gate only when the output of said comparator circuit is unstable based on the input trigger signal and timing signal.

Abstract: An exemplary embodiment of the present invention is an apparatus for receiving sweep testing signals and generating frequency response values therefrom. The apparatus includes a test input, a controller, a receiver circuit and a measurement circuit. The test input has a first connection arrangement for connecting to a test output of the sweep transmitter and also has a second connection arrangement for connecting to a terminal of the communication system to be tested. The controller is operable to generate a sweep control signal responsive to a sweep plan. The receiver circuit has a control input connected to receive the sweep control signal from the controller, and is operable to tune to a plurality of frequencies responsive to the sweep control signal. The measurement circuit is coupled to the receiver circuit and is operable to generate measurement signals corresponding to the plurality of frequencies.

Abstract: A measuring device and method use a spectrum analyzer. The spectrum analyzer comprises a display screen controlled by a processor on which a spectrum of an input signal is displayed in a frequency region on a half portion of the display screen and a noise level at a frequency associated with the input signal is displayed in a time region on another half portion of the display screen.