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Topic: Buffer amplifier

	Buffer - Wikipedia, the free encyclopedia
		In computing a buffer is a portion of memory set aside to store data, often before it is sent to an external device or as it is received from an external device.
		Buffers may be mechanical, as in certain computer magnetic tape drives or a film buffer loop in an movie projector.
		A tight buffer consists of a polymer coating in intimate contact with the primary coating applied to the fiber during manufacture.
	en.wikipedia.org /wiki/Buffer (336 words)

	Buffer amplifier -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-26)
		Typically a buffer amplifier is used to transfer a voltage from a first circuit, having a high (A material's opposition to the flow of electric current; measured in ohms) impedance level, to a second circuit with a lower impedance level.
		The interposed buffer amplifier prevents the second circuit from loading the first circuit unacceptably and interfering with its desired operation.
		A (An unreduced or unbroken completeness or totality) unity gain buffer amplifier may be constructed very simply by connecting the output of an (Click link for more info and facts about operational amplifier) operational amplifier to its inverting input, and using the non-inverting input.
	www.absoluteastronomy.com /encyclopedia/B/Bu/Buffer_amplifier.htm (244 words)

	Buffer Amplifier
		Figure 2-28 is the schematic diagram of a buffer amplifier.
		Thus, the buffer amplifier reduces interaction between the load and the oscillator.
		2-29 illustrates a shunt-fed Hartley oscillator with a buffer amplifier.
	www.tpub.com /content/neets/14181/css/14181_96.htm (171 words)

	United States Patent: 4,300,574
		A device according to claim 4 wherein said meter amplifier comprises an operational amplifier having a feedback circuit such that the feedback is proportional to current in said meter and said amplifier acts as an undamped current source.
		The minus input of operational amplifier 70 is further connected to the output of the operational amplifier 70 and is also coupled to terminal 26 via variable resistor 74.
		The operational amplifier 70 is arranged such that it is a high input impedance, and low output impedance amplifier with a unity gain.
	www.cs.cmu.edu /~dst/Secrets/E-Meter/briggs-patent.html (3184 words)

	Current and voltage autozeroing integrator - Patent 4163947
		This current from the buffer amplifier cancels and compensates for the current flowing into the input of the integrator and prevents the integrator from drifting due to this current.
		This input current is applied to the input of a buffer amplifier comprising a differential input operational amplifier 12, feedback resistor 14 connected from the output to the inverting input of op-amp 12, and input resistor 16.
		During the autozero cycle, the input to input buffer amplifier 10 is disconnected.
	www.freepatentsonline.com /4163947.html (2925 words)

	Buffer (Site not responding. Last check: 2007-10-26)
		In computing a buffer is a portion of memory set aside tostore data, often before it is sent to an external device or as it is received from an external device.
		An isolating circuit, often an amplifier, used to minimize the influence of a driven circuit on thedriving circuit.
		Note: The buffer may take the form of a miniature conduit, contained within the cable and called a loose buffer, or loose buffer tube, in which one or more fibers may be enclosed, often with alubricating gel.
	www.therfcc.org /buffer-14346.html (214 words)

	The Tube CAD Journal: Out of Control: The missing sonic controls
		Whereas the global feedback buffer is usually run in lean Class-AB mode, in order to reduce power consumption, the local feedback buffer is usually run in beefy Class-A mode, as the higher currents both enhance the linearity and extend the frequency bandwidth.
		In short, a high-power buffer is a special type of power amplifier: it relays its input voltage to its output un-amplified and it delivers the needed current increase into the load.
		A typical power amplifier has a voltage divider in the form of a feedback loop, bridging its output to its input, which defines the gain of the final gain of the amplifier.
	www.tubecad.com /articles_2002/Power_Buffers/page2.html (652 words)

	High Impedance Buffer and Broadband Amplifier for Digital Freq
		These two devices, the RF buffer and the broadband amplifier, were primarily designed for the input to the front end of a frequency meter and its prescaler, in particular the EA Digital Frequency Counter.
		The performance of this amplifier was measured using a signal generator and an attenuator driving the amplifier into a resistive load.
		Buffer amplifiers are used to isolate one circuit from another - hence the name.
	www.arising.com.au /people/Holland/Ralph/buffer/highimpedanceprobe.htm (2108 words)

	buffer amplifiers
		This class of amplifier is designed to follow low level stages, one example is a crystal oscillator.
		As a matter of interest a buffer amplifier is not solely limited to following an oscillator.
		This buffer amplifier configuration, called a "source follower", is capable of high power gain, perhaps as much as 25 db BUT the voltage output would be only around 90% of the input which is a voltage gain of -0.5 dB (loss)
	my.integritynet.com.au /purdic/buffer-amplifiers.htm (822 words)

	analogZONE Columnist Dennis Feucht: Buffer Amplifier Design (Site not responding. Last check: 2007-10-26)
		The x1 voltage amplifier, or "buffer," is a standard building block of analog design.
		When high precision and minimal space are not worth the extra cost, a dual-JFET amplifier costing 50¢ in parts can deliver multiple hundreds of megahertz of bandwidth with an offset error of 10 mV, or less, and an offset drift of 10 mV/°C or less.
		The design goal of the x1 voltage amplifier is that of the ideal voltage amplifier: infinite input impedance, zero output impedance, and linearity.
	www.analogzone.com /col_012004d.htm (175 words)

	MOSFET push-pull buffer/amplifier
		The amplifier at the right uses two feedback loops to lower the output impedance and distortion.
		This amplifier, unlike the previous MOSFET amplifiers, must be run in strict class-A, so the idle current will be quite high, at half of the peak current demand.
		This amplifier is effectively the equivalent to a normal source follower amplifier with +/- voltage rails twice that of this amplifier’s single rail; the magic of inductors.
	www.tubecad.com /index_files/page0021.htm (609 words)

	Unity Gain Buffer Amplifier (Site not responding. Last check: 2007-10-26)
		When you use an operational amplifier in a circuit you often need to remember that the operational amplifier has a very high gain.
		In an operational amplifier, we have a relationship between the output voltage and the input voltages at the input terminals of the operational amplifier.
		You need to distinguish between the gain of the operational amplifier (which is large and postive) and the gain of the circuit which is much smaller and can be negative (like it is for this circuit).
	www.facstaff.bucknell.edu /mastascu/eLessonsHTML/OpAmps/OpAmp2Note2Gain.html (430 words)

	Video clamping circuit - Patent 4544951
		The current If is then amplified by the operational amplifier 13, and thereafter the amplified current is converted into a DC voltage by means of the diode 14, capacitor 15 and resistor 16.
		Then, the DC voltage is added to the output from the buffer amplifier 3 via the operational amplifier 17, resistor 18 and capacitor 19 in an anti-phase relation, whereby it cancels the effects due to potential variation at the point A as already described in connection with FIGS.
		Thus, the output from the transistor 3 constituting a buffer amplifier cannot be sufficiently clamped, as shown in FIG.
	www.freepatentsonline.com /4544951.html (1655 words)

	Choosing The Optimum Buffer/ADC Combination For Your Application - Maxim/Dallas
		The drive amplifier, or buffer, must provide a low source impedance and sufficient output current to drive the ADC inputs, and its high-frequency output impedance must be sufficiently low to avoid excessive conversion error.
		For example, the LSB for a 16-bit ADC with a 5.000V unipolar input range is 76µV. To approximate the amplifier's error contribution, compare that number to the amplifier's input offset voltage, drift, and noise, all multiplied by its closed-loop gain.
		This op amp is configured as an ADC buffer with a noninverting gain of +2V/V. Also noteworthy as drive amplifiers are the MAX4106/MAX4107 op amps, which combine high speed with an ultra-low noise level of 0.75nV/Hz.
	www.maxim-ic.com /appnotes.cfm?an_pk=1094 (2462 words)

	EMS Space & Technology - Commercial Space Products - Microwave & Power
		The Buffer Amplifier is a highly reliable, lightweight, space-qualified MIL-STD-1553B bus bridge with variable custom design capabilities.
		Our design includes a buffer amplifier to minimize load pulling, optional frequency command by varactor circuit, as well as optional output frequency filtering for improved harmonic rejection, and voltage regulator circuit.
		Both oscillator and buffer amplifier are housed in a temperature controlled oven.
	www.ems-t.com /STG/commercial/commercial_microwave.asp (669 words)

	Buffer Amplifier : Analog Devices : Buffer Amplifier (Site not responding. Last check: 2007-10-26)
		No other company is more committed to developing the Buffer Amplifier that will make the digital future possible.
		ADI designs, manufactures and markets Buffer Amplifier products as well as high-performance, high-precision signal processing ICs that make pictures vibrant, voices clear, connections continuous and products portable.
		ADI is your source for the Buffer Amplifier as well as over 10,000 other products that serve the needs of more than 60,000 customers worldwide.
	www.analog.com /buffer_amplifier.html (278 words)

	Micor discriminator buffer amplifier (Site not responding. Last check: 2007-10-26)
		This is an image of a discriminator buffer amplifier for use in a Motorola® Micor®
		This amplifier is used in the Micor Muteboard©.
		The input terminal of the buffer is connected to pin 3 of the P903 interconnect pins of a mobile or basestation audio and squelch board.
	www.repeater-builder.com /rbtip/buffer.html (146 words)

	Compound Semiconductor - Products
		Mimix Broadband, a fabless IC manufacturer, has introduced a GaAs MMIC buffer amplifier supplied in a surface mount leadless chip carrier compatible with high volume surface mount technology (SMT) process.
		This SMT packaged three-stage buffer amplifier can be biased for low noise or power configurations.
		This SMT packaged buffer amplifier, identified as XB1001P1, is well suited for wireless communications applications such as millimeter-wave point-to-point radio, local multipoint distribution services (LMDS), SATCOM and VSAT applications.
	www.compoundsemiconductor.net /press/3831 (197 words)

	Buffer amplifier - a reference guide from Electronicstalk
		We see from your search that you're looking for information on the term "Buffer amplifier", and we have a large number of manufacturers' news stories and technical articles here on Electronicstalk which will be of interest.
		A few weeks before, we featured the news story Instrumentation amplifier runs down to 1.8V from Analog Devices: "Analog Devices has released the industry's first instrumentation amplifier to offer high precision at voltages as low as 1.8V.".
		Take a look also at the news story from MRC Components, MMIC amplifier runs up to 5GHz, as well as VCOs take buffer amplifiers onboard from MRC Components, and 16bit DACs shrink to SOT-23 outline from Analog Devices.
	www.electronicstalk.com /guides/buffer-amplifier.html (240 words)

	Sensors Magazine Online - August 2000-THE OPTIMUM Buffer-ADC COMBiNATION (Site not responding. Last check: 2007-10-26)
		The buffer must provide a low source impedance and sufficient output current to drive the ADC inputs, and its high-frequency output impedance must be sufficiently low to avoid excessive conversion error.
		ADC manufacturers often recommend a specific amplifier for a given converter, but the combination you choose (ADC and buffer) must be compatible with the target system.
		Another way to evaluate op amps as drive amplifiers is to compare their numerical specifications to the weight (step size) of the ADC’s LSB in volts.
	www.sensorsmag.com /articles/0800/84/main.shtml (2151 words)

	Compound Semiconductor - Products
		Using 0.15 micron gate length GaAs PHEMT device model technology, this buffer amplifier covers the 35 to 45 GHz frequency bands.
		This device can also be operated with all three stages biased in parallel or with independent bias for input and output stages, as required to optimize performance.
		This amplifier, identified as XB1005, serves as an excellent LNA or buffer amplifier, and is well suited for wireless communications applications such as millimeter-wave point-to-point radio, local multipoint distribution services (LMDS), SATCOM and VSAT applications.
	www.compoundsemiconductor.net /press/5536 (313 words)

	Deglitching Techniques for High-Voltage R-2R DACs - Maxim/Dallas
		Because the glitch occurs right after a DAC is updated and disappears within the first few microseconds, if the DAC output and output buffer amplifier input are decoupled when the DAC is updated and stay decoupled until the glitch disappears, the glitch will not pass through the output buffer amplifier.
		The amplifier output is maintained at this DC level while the glitch occurs.
		With a unity-gain buffer amplifier following the DAC output, the sampling switch must have a high breakdown voltage.
	www.maxim-ic.com /appnotes.cfm/appnote_number/583 (1045 words)

	Audio Amplifiers
		Used in conjunction with a standard PSTN or ISDN telephone it offers similar capabilities to a hybrid, and is equipped with a handset socket and switching to select handset or 4-wire operation.
		There are two input buffers per card, and four output drivers each with 6 resistively distributed outputs.
		One or other half of the card can be used as a simple balancing or unbalancing amplifier, but a complete card is a cost-effective way of unbalancing audio prior to input to a switcher (such as the VX-8500 Series) and re-balancing it after switching, saving an entire switching level.
	www.vtx.co.uk /audio/amplifier.htm (609 words)

	Buffer Amplifier Accessory Specifications
		The Buffer Amplifier is not required for using Mac the Scope.
		The Buffer Amplifier and Calibrator Accessory is provided only for users needing to monitor high impedance signals (for instance, tracing signals on circuit boards).
		This frequency response is adequate for use with a 44.1 kHz sample rate, and is limited by the LMC6042AIN micropower operational amplifier, whose design trades speed for low-power operation.
	www.channld.com /buf2spc.html (374 words)

	Unity Gain Buffer Amplifier (Site not responding. Last check: 2007-10-26)
		However, at the output terminal you can draw whatever amount of current the operational amplifier can supply (and that depends upon the kind of operational amplifier you use).
		Those are shown with lighter lines that go through the connecting "holes" in the drawing.
		They are there to show you how the various wires are actually connected to the operational amplifier through metallic connections under the board.
	www.facstaff.bucknell.edu /mastascu/eLessonsHTML/OpAmps/OpAmp3Note1Buffer.html (250 words)

	Printer Friendly Version (Site not responding. Last check: 2007-10-26)
		Isolation between two circuit stages is often achieved by introducing a buffer amplifier between them.
		In discussing these uses for buffer amplifiers, this article focuses on a voltage-controlled oscillator (VCO) whose active device is an NPN bipolar transistor.
		One cause of conducted degradation can be the RF power amplifier (PA) turning on or off, which can cause an impedance change in the signal path or in other circuits, thereby picking up radiated RF energy and conducting it back through the signal path.
	www.mwrf.com /Articles/Print.cfm?ArticleID=5513 (1037 words)

	Post Amplifier : Analog Devices : Post Amplifier (Site not responding. Last check: 2007-10-26)
		No other company is more committed to developing the Post Amplifier that will make the digital future possible.
		ADI designs, manufactures and markets Post Amplifier products as well as high-performance, high-precision signal processing ICs that make pictures vibrant, voices clear, connections continuous and products portable.
		ADI is your source for the Post Amplifier as well as over 10,000 other products that serve the needs of more than 60,000 customers worldwide.
	www.analog.com /post_amplifier.html (278 words)

	Tektronix: Products > High-impedance Buffer Amplifier System - TCA-1MEG: Introduction
		The TekConnect family of amplifiers, probes and adapters make it the ideal solution for such challenges, delivering a variety of acquisition capabilities through the use of existing compatible TekConnect and TEKPROBE™ measurement tools.
		The TCA-1MEG amplifier system provides a 1 MΩ path that is easily removed and replaced with a wide array of TekConnect probes, amplifiers and adapters.
		This amplifier system delivers versatility to Tektronix high-performance oscilloscopes through the addition of input coupling (selectable), bandwidth limit (selectable), and a 1 MΩ input that provides access to a wide array of measurement solutions.
	tek.com /site/ps/0,,60-15629-INTRO_EN,00.html?wt=254&link=/site/ps/... (467 words)

	TF2 Class A VU meter buffer amplifier (Site not responding. Last check: 2007-10-26)
		The meter amplifier can operate either balanced or unbalanced with either input grounded.
		The rectifier assembly in the VU meter clips the audio signal, the effect being limited by the 3K6 resistor and the meter impedance.
		Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders.
	www.phoenixaudio.net /tf2classa.htm (147 words)

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