THESE DE DOCTORAT Monsieur Xusheng WANG
... ultrasonic transducers is utilized to generate a focused beam of ultrasound (1M~10MHz) into a small area of the cancer target locations within the body. Most HIFU system are guided by magnetic resonance imaging (MRI) in nowadays. In this paper, a half-bridge class D power amplifier and an automatic ...
... ultrasonic transducers is utilized to generate a focused beam of ultrasound (1M~10MHz) into a small area of the cancer target locations within the body. Most HIFU system are guided by magnetic resonance imaging (MRI) in nowadays. In this paper, a half-bridge class D power amplifier and an automatic ...
![[3] JP Alegre et al, “SiGe analog circuit for an 802.11a - DR-NTU](http://s1.studyres.com/store/data/004873704_1-1313e782101139bb81c0a9db2ed0f523-300x300.png)
[3] JP Alegre et al, “SiGe analog circuit for an 802.11a - DR-NTU
... Conventionally, a VGA is realized in a single stage, or by cascading only two or three stages. Cascading too many stages has several difficulties, such as high power consumption, large die area and limited bandwidth. In particular, the gain error requirement for a single-stage amplifier is very cruc ...
... Conventionally, a VGA is realized in a single stage, or by cascading only two or three stages. Cascading too many stages has several difficulties, such as high power consumption, large die area and limited bandwidth. In particular, the gain error requirement for a single-stage amplifier is very cruc ...
How Microphones Work
... original sound. To perform this task microphones use a thin membrane, known as a diaphragm, which mimics the function of the human ear. When sound waves strike a microphone's diaphragm, they cause it to move within an electro-magnetic field, which, in turn, creates a variance in an electrical curren ...
... original sound. To perform this task microphones use a thin membrane, known as a diaphragm, which mimics the function of the human ear. When sound waves strike a microphone's diaphragm, they cause it to move within an electro-magnetic field, which, in turn, creates a variance in an electrical curren ...
TPA2032D1 数据资料 dataSheet 下载
... The TPA2032D1 (2V/V gain), TPA2033D1 (3V/V gain), and TPA2034D1 (4V/V gain) are 2.75-W high efficiency filter-free class-D audio power amplifiers, each in an approximately 1.5-mm × 1.5-mm wafer chip scale package (WCSP) that requires only one external component. The pinout is the same as the TPA2010 ...
... The TPA2032D1 (2V/V gain), TPA2033D1 (3V/V gain), and TPA2034D1 (4V/V gain) are 2.75-W high efficiency filter-free class-D audio power amplifiers, each in an approximately 1.5-mm × 1.5-mm wafer chip scale package (WCSP) that requires only one external component. The pinout is the same as the TPA2010 ...
Precision Dual-Channel Difference Amplifier AD8270
... it can be configured as a high performance difference amplifier with gains of 0.5, 1, or 2. It can also be configured in over 40 singleended configurations, with gains ranging from −2 to +3. The AD8270 is the first dual-difference amplifier in the small 4 mm × 4 mm LFCSP. It requires the same board ...
... it can be configured as a high performance difference amplifier with gains of 0.5, 1, or 2. It can also be configured in over 40 singleended configurations, with gains ranging from −2 to +3. The AD8270 is the first dual-difference amplifier in the small 4 mm × 4 mm LFCSP. It requires the same board ...
AD9984A High Performance 10-Bit Display Interface Data Sheet
... Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. N ...
... Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. N ...
Fundamentals and Advancements in Generator
... difference, so voltmeters (VM/I and VM/R) for incoming voltage and running voltage are often included. The operator can determine whether to raise or lower the generator voltage based upon these indications. Additionally, frequency meters (not shown in Fig. 1) are sometimes included on the synchroni ...
... difference, so voltmeters (VM/I and VM/R) for incoming voltage and running voltage are often included. The operator can determine whether to raise or lower the generator voltage based upon these indications. Additionally, frequency meters (not shown in Fig. 1) are sometimes included on the synchroni ...
ni elvis i
... The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its o ...
... The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its o ...
Institutionen för systemteknik High-Speed Hybrid Current mode Sigma-Delta Modulator
... using the switched-capacitor (SC) integrator and the switched-current (SI) integrator circuits. The SC integrator technique provides high accuracy but occupies a larger area. Unlike the SC integrator, the SI integrator offers low input impedance and parasitic capacitance. This makes the SI integrato ...
... using the switched-capacitor (SC) integrator and the switched-current (SI) integrator circuits. The SC integrator technique provides high accuracy but occupies a larger area. Unlike the SC integrator, the SI integrator offers low input impedance and parasitic capacitance. This makes the SI integrato ...
Full-Text PDF
... zero-current-switching (ZCS) for output rectifiers [14]. Additionally, the converter benefits from a narrow switching frequency range with light load and ZVS capability, even with no load [15–19]. The comparative study between the LLC resonant converter and three other isolated DC-DC converters was ...
... zero-current-switching (ZCS) for output rectifiers [14]. Additionally, the converter benefits from a narrow switching frequency range with light load and ZVS capability, even with no load [15–19]. The comparative study between the LLC resonant converter and three other isolated DC-DC converters was ...
M I C -S
... The encoding used for the digital control word in a current steering DAC has a large influence on the circuit performance, e.g., in terms static linearity and glitches. In this work, two DAC architectures are developed. These are denoted the decomposed and partially decomposed architectures and util ...
... The encoding used for the digital control word in a current steering DAC has a large influence on the circuit performance, e.g., in terms static linearity and glitches. In this work, two DAC architectures are developed. These are denoted the decomposed and partially decomposed architectures and util ...
KX-TG4012LAT KX-TG4013LAT KX-TGA403LAT
... Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB. • PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100 °F (600 °C). • When applying PbF solder to double layered boards, please check the component side for ...
... Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB. • PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100 °F (600 °C). • When applying PbF solder to double layered boards, please check the component side for ...
Chapter 1: The Op Amp
... loop gain, signal gain, and noise gain. They are similar in nature, interrelated, but different. We will discuss them all in detail. The open-loop gain is not a precisely controlled spec. It can, and does, have a relatively large range and will be given in the specs as a typical number rather than a ...
... loop gain, signal gain, and noise gain. They are similar in nature, interrelated, but different. We will discuss them all in detail. The open-loop gain is not a precisely controlled spec. It can, and does, have a relatively large range and will be given in the specs as a typical number rather than a ...
A Courseware Sample Telecommunications 39975-F0
... immediately. This occurs because the I layer increases the number of minority carriers, thereby increasing the minority carrier lifetime. If the period of the RF signal is shorter than the minority carrier lifetime, the diode will lack sufficient time to pass from the "on" (conducting) state to the ...
... immediately. This occurs because the I layer increases the number of minority carriers, thereby increasing the minority carrier lifetime. If the period of the RF signal is shorter than the minority carrier lifetime, the diode will lack sufficient time to pass from the "on" (conducting) state to the ...
6A Boost/Inverting DC/DC Converter with Fault Protection
... switch that can be tied together for a total current limit of 6A. The LT3579 is ideal for many local power supply designs. It can be easily configured in Boost, SEPIC, Inverting, or Flyback configurations, and is capable of generating 12V at 1.7A, or –12V at 1.2A from a 5V input. In addition, the LT ...
... switch that can be tied together for a total current limit of 6A. The LT3579 is ideal for many local power supply designs. It can be easily configured in Boost, SEPIC, Inverting, or Flyback configurations, and is capable of generating 12V at 1.7A, or –12V at 1.2A from a 5V input. In addition, the LT ...
Virtex-6 FPGA PCB Design Guide www.BDTIC.com/XILINX UG373 (v1.2) June 10, 2010
... substrate material (usually FR4, an epoxy/glass composite) with copper plating on both sides has portions of copper etched away to form conductive paths. Layers of plated and etched substrates are glued together in a stack with additional insulator substrates between the etched substrates. Holes are ...
... substrate material (usually FR4, an epoxy/glass composite) with copper plating on both sides has portions of copper etched away to form conductive paths. Layers of plated and etched substrates are glued together in a stack with additional insulator substrates between the etched substrates. Holes are ...
差分放大器系列AD8334 数据手册DataSheet 下载
... (VGAs). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz. Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gai ...
... (VGAs). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz. Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gai ...
sinuous antenna.
... In 1842, Joseph Henry used vertical wires on the roof of his house to detect lightning flashes. In 1864, Clerk Maxwell presents his equations. In 1885, Thomas Edison patented a communications system that utilized top-loaded, vertical antennas for telegraphy. In 1887, Heinrich Hertz used his “Hertzia ...
... In 1842, Joseph Henry used vertical wires on the roof of his house to detect lightning flashes. In 1864, Clerk Maxwell presents his equations. In 1885, Thomas Edison patented a communications system that utilized top-loaded, vertical antennas for telegraphy. In 1887, Heinrich Hertz used his “Hertzia ...
PSK-20 Transceiver Board Kit Instructions
... Product detector U2 receives the 9 Mhz IF filter output and multiplies (mixes) it with a ~ 9 Mhz LO signal (from schematic point 'E'. This results in an audio output at pin 5 of that IC. C13 provides rolloff of the audio to reduce high-frequency 'hiss'. Op-amp U3 and associated components provide au ...
... Product detector U2 receives the 9 Mhz IF filter output and multiplies (mixes) it with a ~ 9 Mhz LO signal (from schematic point 'E'. This results in an audio output at pin 5 of that IC. C13 provides rolloff of the audio to reduce high-frequency 'hiss'. Op-amp U3 and associated components provide au ...
Document
... (VGAs). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz. Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gai ...
... (VGAs). Optimized for ultrasound systems, they are usable as a low noise variable gain element at frequencies up to 120 MHz. Included in each channel are an ultralow noise preamp (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamp with adjustable output limiting. The LNA gai ...
PECL Clocks and Termination
... voltage is nominally Vcc – 2.0V. For 3.3v LVPECL, this common mode reference supply is 1.3v. Extra power supplies are not attractive so alternative termination schemes will be shown. We receive questions from time to time regarding why one vendor’s PECL device functions without pull-down terminatio ...
... voltage is nominally Vcc – 2.0V. For 3.3v LVPECL, this common mode reference supply is 1.3v. Extra power supplies are not attractive so alternative termination schemes will be shown. We receive questions from time to time regarding why one vendor’s PECL device functions without pull-down terminatio ...
Heterodyne
Heterodyning is a radio signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden, in which new frequencies are created by combining or mixing two frequencies. Heterodyning is used to shift one frequency range into another, new one, and is also involved in the processes of modulation and demodulation. The two frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer. In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum f1 + f2 of the two frequencies, and the other at the difference f1 − f2. These new frequencies are called heterodynes. Typically only one of the new frequencies is desired, and the other signal is filtered out of the output of the mixer. Heterodynes are related to the phenomenon of ""beats"" in acoustics.A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.