Class 324/76.43 - With plural mixers

Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter including more than one circuit that generates
No. of patents: 34
Last issue date: 10/18/2011

Number	Title	Issue Date
8040125	Device and method for the analysis of a measured signal transmitted via a multi-channel system A device, in particular, a multi-channel oscilloscope, for the analysis of at least one measured signal transmitted via a multi-channel system, with several measurement channels. The device includes in each case a sampling device, a baseband mixing device, and a fil...	10/18/2011
7061222	Automated testing of frequency converter device A frequency converter is tested. Labels for a plurality of mixing products are displayed. In response to a user selecting a first mixing product from the plurality of mixing products, appropriate frequencies for the first mixing product are calculated. Also, a measu...	06/13/2006
6996388	High-frequency signal receiver A receiver is operable even if including a local oscillator generating a signal at high frequencies but not in a wide frequency range. The receiver includes: a first frequency converter for mixing a received signal with a first local oscillation signal to convert th...	02/07/2006
6677882	Multi-octave high-resolution receiver for instantaneous frequency measurements An RF band receiver for concurrently monitoring a plurality of contiguous channels within the RF spectrum to unambiguously detect time-coincident signals. The receiver includes a plurality of transmission paths feeding a like number of digital, mixed-base...	01/13/2004
6459278	Method for characterizing delay of frequency translation devices Absolute delay of a FTD is characterized by applying a stimulus signal to a first port of the FTD. A second port of the FTD is coupled to a delay element having a known delay and a reflective termination. A drive signal is applied to a third port of the F...	10/01/2002
6362631	Method for characterizing delay of frequency translation devices Absolute delay of a FTD is characterized by applying a stimulus signal to a first port of the FTD. A second port of the FTD is coupled to a delay element having a known delay and a reflective termination. A drive signal is applied to a third port of the F...	03/26/2002
6064694	Frequency translating device transmission response system A three-pair measurement method determines the amplitude and phase transmission response of frequency translating devices including a device under test and two test devices using a vector network analyzer and a controller where one of the devices has reci...	05/16/2000
5937006	Frequency translating device transmission response method A three-pair measurement method determines the amplitude and phase transmission response of frequency translating devices including a device under test and two test devices using a vector network analyzer and a controller where one of the devices has reci...	08/10/1999
5706202	Frequency spectrum analyzing apparatus and transmitter characteristics measuring apparatus using the same In a frequency spectrum analyzing apparatus which utilizes a DFT (discrete Fourier transform) filter bank, and can detect the peak value of the amplitude of an input signal, a time sequence signal generation circuit samples an input signal to convert it i...	01/06/1998
5642039	Handheld vector network analyzer A handheld vector network analyzer (VNA) providing a wide bandwidth test signal FO utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or harmonic generator. With a 550-1100 MHz narrowband t...	06/24/1997
5323104	Method and arrangement for demodulating a frequency modulated signal The invention relates to a method and to an arrangement for demodulating a signal (f) preferably frequency modulated with digital information, and then particularly a frequency shift modulated signal, with a frequency counter detector (16) which directly ...	06/21/1994
4916383	Frequency response analysis In a frequency response analyzer capable of testing a system under test at a higher frequency F derived from a signal generator providing a relatively higher frequency F/K. A reference signal of frequency F-C is supplied to a mixer where it is multiplied ...	04/10/1990
4896102	Spectrum analyzer A spectrum analyzer for analyzing an input spectrum. The analyzer includes a down converter capable of converting blocks or portions of the input spectrum to a corresponding predetermined output band of frequencies. A stepping device associated with the d...	01/23/1990
4868494	Methods and apparatus for frequency response analysis In a frequency response analyser for operation at high frequencies a signal of frequency F for application to a system under test (15) is generated from a frequency synthesizer (11) capable of operation only at a relatively lower frequency F/K by generati...	09/19/1989
4852123	Nearly DC IF phase locked transceiver A receiver which converts the RF carrier to a very low frequency and incorporates a PLL demodulator which allows the IF to be AC coupled. This PLL demodulator does not include the IF filters. The bandwidth of the PLL demodulator is wide enough to demodula...	07/25/1989
4799020	Time variant frequency correction technique A time variant frequency correction technique uses a frequency conversion circuit to obtain an intermediate frequency and an adjusted local oscillator frequency from an input signal frequency, a local oscillator frequency and a reference oscillator freque...	01/17/1989
4791577	Frequency shift for removing spurious spectral components from spectrum analyzer output Apparatus for eliminating spurious spectral components from a spectral analyzer output signal. An input signal is mixed with two separate local oscillator frequencies separated by a frequency offset value to produce two intermediate-frequency signals, whi...	12/13/1988
4748399	Multichannel phase noise measurement system A multichannel phase noise measuring system is disclosed which is capable of measuring the phase noise of two signal source operating between 100 MHz and 24 GHz. This system has two input channels and a mixer which produces a differe...	05/31/1988
4739251	Analysis circuit for an amplitude-modulated electric signal comprising a frequency transposer Circuit for analyzing an amplitude-modulated electric signal. This circuit comprises a quartz oscillator operating at a frequency fq, a frequency transposer making it possible to transpose the spectrum of the incident signal about fq, a narrow filter cent...	04/19/1988
4737713	Apparatus and method for processing an electrical signal and increasing a signal-to-noise ratio thereof An apparatus and method for processing a first electrical signal having a frequency interval I containing information, and increasing the signal-to-noise ratio thereof utilizes a mixer for shifting the frequencies of the first signal in the interval I to ...	04/12/1988
4716362	Surface wave dispersive filter spectrum analyzer A surface wave dispersive filter spectrum analyzer is provided comprising two identical assemblies having "M-C-M" structure (premultiplication, convolution and post-multiplication, respectively by a first, second and third linearly frequency modulated ram...	12/29/1987
4710702	Heterodyne type signal-measuring method and a measuring apparatus including automatic detuning correction means A signal-measuring apparatus for measuring a level of a signal to be measured includes a reference signal oscillator, a variable local signal oscillator, a heterodyne type mixer, a bandpass filter and automatic detuning correction means. In the automatic ...	12/01/1987
4672308	Enhanced frequency determination for spectrum analyzers or the like An arrangement is provided for enhancing the accuracy of frequency determination in a spectrum analyzer or the like having a local oscillator heterodyned with and locked to a frequency comb, by providing a determination of whether the local oscillator fre...	06/09/1987
4670712	Frequency measurement method and device For measuring the frequency of a sine shaped signal accompanied by noise, for example Gaussian noise, in an input signal, that input signal is applied to two measuring arms, possibly after heterodyning. One arm includes a counter for counting the zero cro...	06/02/1987
4668910	Method and circuit for determining the presence or absence of at least one frequency of known value in an input signal composed of several frequencies A method and circuit for determining the presence or absence of a frequency of known value in an input signal composed of several frequencies employ a frequency generator, to which a stable reference signal is supplied, for generating two switching signal...	05/26/1987
4647847	Method and apparatus for eliminating harmonic skip A method is provided to eliminate harmonic skip problems in a down-conversion system. The method makes use of the relationship between the frequency of the intermediate frequency signal and the harmonic number of the local oscillator signal with respect t...	03/03/1987
4587483	Measurement of elapsed time for a predetermined frequency shift The circuit arrangement described measures the time when a frequency Fo, changing towards a desired frequency value, differs by not more than a predetermined amount (e.g. 100 Hz) from the desired value. Initially Fo is mixed with the...	05/06/1986
4568878	Spectrum analyzers Spurious responses generated by operation of a spectrum analyzer are eliminated from the analyzer's display by selecting a feature of the displayed signal for testing, adjusting the analyzer controls to display the feature of interest at the center of the...	02/04/1986
4415854	Microwave spectrum analyzer with a synthesized local oscillator A microwave spectrum analyzer comprising a first mixer which provides beats between the output of an YIG oscillator and the spectrum to be analyzed. A second mixer carries out a fixed transposition of said beats. The said YIG oscillator is locked to harmo...	11/15/1983
4156183	Method of and means for measuring the level of test signals over selected wide band frequency ranges To measure the level of test signals over a frequency range of variable bandwidth B, bounded by a lower frequency f' and an upper frequency f", these signals are heterodyned with a variable modulating frequency to produce a frequency spectrum encompassing...	05/22/1979
4037152	Frequency indicating system Disclosed is an apparatus and process for indicating or measuring the frequency of an incoming signal of unknown frequency. The system includes a plurality of processing channels, each of said channels including a pair of oscillators offset in frequency c...	07/19/1977
3986113	Two channel test instrument with active electronicphase shift means A network analyzer is provided with an electronically variable phase shifter in the IF portion of the reference channel, and the phase shifter is connected to sweeping signal generator (sweeper) driving the device under test. As the output frequency of th...	10/12/1976
3983491	Television channel indicator The video local oscillator signal is mixed with a signal from a fixed frequency oscillator to produce a difference frequency signal, which is frequency divided and gated to a counter during a predetermined time period in such a manner that the final count...	09/28/1976
3955137	Adjustable frequency scanning signal processor A compressive or "microscan" signal processor adapted for the simultaneous measurement of multifrequency signal components which encompass a broad frequency spectrum. In accordance with one embodiment of the invention, the applied signals are processed th...	05/04/1976

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Class 324/76.43 - With plural mixers