62 results about "Spurious response" patented technology

A system and method for implementing dynamic spur avoidance in a high speed receiver environment is provided. For a plurality of radio frequency (RF) input signal ranges, a range of intermediate frequency (IF) signals and a noise floor for each IF signal is determined. An identification of spurs that will affect the noise floor is also determined from a look up table for each range of the RF inputs. A frequency plan that sets local oscillator and constituent oscillator signals is selected such that the IF signals generated from the RF input will avoid lower order spurious responses of the identified spurs within the IF signal range.

A computer system executes a method that detects an edge of an object with a Canny operator. The method calculates a gradient strength of pixels of the image and applies non-maximum suppression to the image to avoid spurious responses to edge detection. The image is divided into multiple partitions based on a brightness distribution of the pixels in the image and a set of dynamic threshold values. Multiple images for the partitions are superimposed to detect an edge of the object.

The invention provides a sound surface wave temperature sensor, which comprises a circuit board and a substrate, wherein the circuit board is provided with an antenna device for receiving and transmitting a signal; and the substrate is provided with a resonant cavity for providing a resonant signal and two reflection grids for absorbing reflection signals. According to the sound surface wave temperature sensor, the resonant signal is provided by the resonant cavity on the substrate to inhibit high-end transverse mode response and the reflection signals are absorbed by the reflection girds to inhibit low-end spurious response; and the corresponding sound surface wave temperature sensor is only composed of two parts, i.e., the circuit board and the substrate, so that the volume of the sound surface wave temperature sensor is reduced and the sound surface wave temperature sensor can be miniaturized in use.

Apparatus and methods for distributing spurious tones through the frequency domain are disclosed. One such apparatus can include a dithering circuit configured to generate a sequence of numbers that exhibit statistical randomness and a variable frequency circuit configured to adjust a frequency of an output based on the sequence of numbers so as to spread energy of spurious tones in a frequency response of the output to lower a noise floor. In one example, spurious tones can be reduced in a negative voltage generator of a radio frequency (RF) attenuator.

A mobile wireless communication device (10) having a direct conversion receiver (20) reduces spurious mixer response by predicting blockers on the received RF signal. The chopping frequency of the mixer is changed (305) dynamically in response to the prediction of blockers on the input signal to avoid the mixing the blocker with chopper spurs, thereby improving the response of the receiver. In some embodiments, the mixer is disabled momentarily (402) to verify that poor signal quality results from mixing chopper spurs with blockers. In hopping mode applications, the chopper frequency is changed only on channels having a low confidence factor (512).

An acoustic wave device having an improved frequency-temperature characteristic and in which a spurious response of the higher order mode is suppressed includes a piezoelectric substrate (2) made of LiNbO3, a SiO2 layer (6) laminated on the piezoelectric substrate (2), and an IDT electrode (3) disposed in an interface of the piezoelectric substrate (2) and the SiO2 layer (6), wherein [phi] and [theta] of Euler angles expressed by ([phi], [theta], [psi]) of LiNbO3 substrate satisfy [phi]=0 DEG and 80 DEG <=[theta]<=130 DEG , respectively. The acoustic wave device using an acoustic wave primarily having an SH wave, wherein [psi] is set to satisfy 5 DEG <=[psi]<=30 DEG .

The invention discloses a quartz crystal resonator. The resonator comprises a shell, a base, pins, a spring plate, conductive adhesives, a film-coated electrode and a wafer, wherein the film-coated electrode comprises a base electrode and a trimming electrode connected with the base electrode; and the film-coated electrode is attached to the surface of the wafer and comprises a lower chromium coating, a silver coating and an upper chromium coating, which are arranged from inside to outside in sequence. The invention also discloses a processing method of the quartz crystal resonator. The spurious response characteristic of the quartz crystal resonator can be improved.

A surface acoustic wave filter comprised of a plurality of surface acoustic wave resonators having different resonance frequencies, the filter comprising a substrate made of lithium niobate, comb electrodes (1201 and 1202) formed on the substrate, and a thin dielectric film covering the comb electrodes (1201 and 1202), wherein the surface acoustic wave resonator having a lower resonance frequency is formed to have a metallization ratio larger than a metallization ratio of the surface acoustic wave resonator having a higher resonance frequency, thereby providing the surface acoustic wave filter and an antenna duplexer featuring superior characteristics with insignificant ripples while suppressing spurious responses of the surface acoustic wave resonators.

An acoustic wave resonance device includes: piezoelectric substrate (1), first acoustic wave resonator (100) provided on an upper surface of piezoelectric substrate (1) and including first interdigital transducer electrode (110), and second acoustic wave resonator (200) provided on piezoelectric substrate (1) and including second interdigital transducer electrode (210). First acoustic wave resonator (100) and second acoustic wave resonator (200) are connected to each other. An overlap width of a plurality of first comb-shaped electrodes (112) forming first acoustic wave resonator (100) is larger than an overlap width of a plurality of second comb-shaped electrodes (212) forming second acoustic wave resonator (200). With such a configuration, frequencies in which a transverse mode spurious response is generated can be distributed and loss can be reduced.

An acoustic wave device having an improved frequency-temperature characteristic and in which a spurious response of the higher order mode is suppressed includes a piezoelectric substrate made of LiNbO3, a SiO2 layer laminated on the piezoelectric substrate, and an IDT electrode disposed in an interface of the piezoelectric substrate and the SiO2 layer, wherein φ and θ of Euler angles expressed by (φ, θ, ψ) of LiNbO3 substrate satisfy φ=0° and 80°≦θ≦130°, respectively. The acoustic wave device using an acoustic wave primarily having an SH wave, wherein ψ is set to satisfy 5°≦ψ≦30°.

The invention discloses a small 3G antenna used for a tablet personal computer. The antenna comprises a high-frequency cable, a low-frequency cable, a feeding point and a ground feedback point, wherein the high-frequency cable, the low-frequency cable, the feeding point and the ground feedback point are arranged on a circuit board, a first partition groove is formed between the high-frequency cable and the low-frequency cable, and a second partition groove is formed between the feeding point and the ground feedback point. The feeding point and the ground feedback point are arranged on a board edge of the circuit board in parallel, and the feeding point is located outside the ground feedback point. The low-frequency cable extends to the board edge on another side of the circuit board from the feeding point along the portion below a second open groove and then detours towards the high-frequency cable, and the first partition groove is located between a tip of the high-frequency cable and a tip of the low-frequency cable. The high-frequency cable extends upward and then leftward along the board edge on one side of the circuit board from the feeding point. The antenna is small and exquisite in size and good in performance, no spurious response needs to be increased to increase the bandwidth, and the problem that low-frequency radiant power and receiving sensitivity are lowered due to the fact that the bandwidth is increased by increasing the spurious response can be effectively solved.