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Topic: Differential amplifier

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	United States Patent Application: 0040090268
		The differential amplifier of claim 7 including a class AB bias circuit coupled between a gate electrode of the pull-up and a gate electrode of the pull-down transistor.
		The differential amplifier of claim 12 including a class AB bias circuit coupled between a gate electrode of the pull-up and a gate electrode of the pull-down transistor.
		The voltage gain of differential input stage 40A is equal to the transconductance of the pair of input transistors 2 and 3 multiplied by the parallel combination of equivalent impedance at the output of current mirror 4,5 and the impedance at the drain of transistor 3.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040090268".PGNR.&OS=DN/20040090268&RS=DN/20040090268 (4983 words)

	Differential amplifier -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		A differential amplifier is a type of an (Click link for more info and facts about electronic amplifier) electronic amplifier that multiplies the difference between two inputs by some constant factor (the differential (The amount by which the revenue of a business exceeds its cost of operating) gain).
		A differential amplifier is the input stage of most (Click link for more info and facts about operational amplifier) operational amplifiers, or op-amps.
		Differential amplifiers are found in many systems that utilise (Feedback in opposite phase with (decreasing) the input) negative feedback, where one input is used for the input signal, the other for the feedback signal.
	www.absoluteastronomy.com /encyclopedia/d/di/differential_amplifier.htm (252 words)

	Differential amplifier (Site not responding. Last check: 2007-10-20)
		A differential amplifier is a type of an electronic amplifier that multiplies the difference between two inputs by some constant factor (the differential gain).
		A differential amplifier is the input stage of most operational amplifiers, or op-amps.
		Differential amplifiers are found in many systems that utilise negative feedback, where one input is used for the input signal, the other for the feedback signal.
	www.worldhistory.com /wiki/D/Differential-amplifier.htm (272 words)

	Tektronix MBD: Applications > Differential Scope Primer Fundamentals
		In Figure 7, a differential amplifier is used to measure the gate drive of the upper MOSFET in an inverter circuit.
		The differential amplifier allows the scope to measure the true VGS signal (a few volt swing) at sufficient resolution such as 2 V/division while rejecting the several hundred volt transition of the source to ground.
		With the amplifier driven to full power with a 1 kHz sine wave, one ten thousandth of the common-mode signal will erroneously appear as VDM at the output of the differential amplifier, which would be 80 V/10,000 or 8 mV.
	www.tek.com /Measurement/App_Notes/DiffOscPrimer/Fundamentals.html (2786 words)

	United States Patent: 6,346,858 (Site not responding. Last check: 2007-10-20)
		A first and second output to the differential amplifier circuit is coupled between one of the pair of the load devices and one of the drain regions for either the first or the second transistor, respectively.
		In one exemplary embodiment, the fist amplifying circuit and the pair of load devices are stacked as circuit layers, one on top of the other, on a first portion of the semiconducting substrate and the common mode feedback circuit is located on a second portion of the substrate.
		The differential amplifier circuit 802 is coupled to the logic circuit 805 and memory circuit 810 by a number of input/output (IO) lines 807 adapted transmitting information between the logo circuit 805, the memory circuit 810 and the differential amplifier circuit 802.
	web.engr.oregonstate.edu /~flf/6346858.html (9277 words)

	Differential equation (Site not responding. Last check: 2007-10-20)
		Parameter estimation of nonlinear stochastic differential equations: simulated maximum likelihood versus extended Kalman...
		Understandings of solutions to differential equations through contexts, web-based simulations, and student discussion.
		In mathematics, a differential equation is an equation in which the derivatives of a function appear as variables.
	hallencyclopedia.com /Differential_equation (249 words)

	Articles - Electronic amplifier (Site not responding. Last check: 2007-10-20)
		Amplifier circuits are classified as A, B, AB and C for analogue designs, and class D and E for switching designs.
		In an analogue amplifier, the signal is applied to the input terminal of the device (base, gate or grid), and this causes a current to flow in proportion to the input between the output terminal and ground (collector, drain or anode).
		While amplifying devices can be treated as linear over some portion of their characteristic curve, they are inherently non-linear; their physics dictates that they operate using a square law.
	www.zgrey.com /articles/Electronic_amplifier (3100 words)

	Single-input, single-output differential amplifier
		This single-input, single-output, differential amplifier is very similar to a single-transistor amplifier as far as input and output signals are concerned.
		When a differential amplifier is connected with a differential input and a differential output, the full potential of the circuit is used.
		When an output signal is taken between the two output terminals of the amplifier (as shown by the phantom connections, resistor, and signal), the combined output signal is twice as great in amplitude as either signal at output number one or output number two.
	www.tpub.com /neets/book8/32b.htm (1160 words)

	United States Patent: 6,512,400 (Site not responding. Last check: 2007-10-20)
		A reference voltage VR is applied to one input of the differential amplifier 11, i.e., a gate terminal of a transistor 21, and an input voltage V1 to be compared to the reference voltage is applied to another input to the differential amplifier 11, i.e., a gate terminal of a transistor 22.
		Because one of the basic components of a comparator is a differential amplifier, which typically involves three transistors coupled in series, operation of the comparator becomes slower and less reliable as power supply voltages are reduced.
		The output signal of the differential amplifier 102 at the line 140 is coupled to the gates of the NMOS transistors 142, 148.
	web.engr.oregonstate.edu /~flf/6512400.html (3932 words)

	The Differential Amplifier (Site not responding. Last check: 2007-10-20)
		This is a CMOS Differential amplifier with current mirror load and the design procedure is explained in Chapter-5 of the textbook CMOS Analog Circuit Design by Allen and Holberg.
		Note that DC Voltage in to be specified as 2V as the voltage is varied from -2V to 2V for the differential amplifier.
		When you designed the differential amplifier by hand you should have got a value of gm1 and the value of Id1 where the subscript 1 refers to the transistor having the Vi+ input.
	www.egr.msu.edu /~zhangjic/Lab/Lab3/3b.html (808 words)

	Differential and Single-Ended Inputs Described (Site not responding. Last check: 2007-10-20)
		Differential inputs go into a true instrumentation amplifier (also called a differential amplifier).
		The outputs of the two amplifiers are then subtracted to give the difference between the + and - inputs, meaning that any voltage which is common to both wires is removed.
		The ability of the instrumentation amplifier to obtain the difference between the + and - inputs whilst rejecting the signal common to both is defined by the common mode rejection ratio (cmrr) and the common mode range.
	www.microlink.co.uk /diffamp.html (260 words)

	Discover Circuits - Amplifier Circuits - Differential
		In such situations, ac-coupling to instrumentation and difference amplifiers is mandatory to extract the ac signal and reject common-mode noise and differential dc voltage....
		The differential voltage across the sense element is generally small and is often riding on a common-mode voltage that is considerably......
		Amplifier and current source emulate instrumentation Amplifier: 11/13/03 EDN Design Ideas / (added 12/04) The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise.
	www.discovercircuits.com /A/a-differential.htm (1113 words)

	Balanced differential amplifier without common-mode feedback circuit (US6160446)
		The balanced differential amplifier has a first single-ended differential amplifier coupled at a first negative differential input terminal to a first input signal through a feedback network also coupled to an output terminal of the first amplifier.
		The balanced differential amplifier also has a second single-ended differential amplifier coupled at a second negative differential input terminal to the second input signal through a second feedback network also coupled to an output terminal of the second amplifier.
		The second amplifier is also coupled at a second positive differential input terminal to the first input signal through a second resistor and to the reference voltage.
	www.delphion.com /details?pn=US06160446__ (201 words)

	Operational Amplifier
		The differential amplifier, emitter-coupled pair, or differential pair, is an essential building block in modern IC amplifiers.
		This cascade configuration is commonly referred to as a two stage operational amplifier because only the differential amplifier and gain stage contribute to the overall voltage gain.
		The differential amplifier is used as the input stage to provide the inverting and noninverting inputs, the high CMRR, and the high input resistance, as well as voltage gain.
	www.geocities.com /alihome1/E313-oamp.html (2954 words)

	Differential amplifier - Chapter 5: DISCRETE SEMICONDUCTOR CIRCUITS - Volume VI - Experiments (Site not responding. Last check: 2007-10-20)
		In the form shown here, it is a rather crude differential amplifier, quite nonlinear and unsymmetrical with regard to output voltage versus input voltage(s).
		This is the essential nature of a differential amplifier: two complementary inputs, with contrary effects on the output signal.
		An ideal differential amplifier ignores all common-mode voltage, which is whatever level of voltage common to both inputs.
	www.allaboutcircuits.com /vol_6/chpt_5/16.html (555 words)

	Differential Amplifier Model DA1850 and DA1855
		The DA1850/1855 is a stand-alone, high-performance 100 MHz differential amplifier.
		At the same time, the amplifier increases the gain by 10 resulting in an equivalent error of 0.1 mV referred to the DA1850/1855 input 100 ppm of the 2 V input signal.
		The DA1855's differential measurement capability will reject any dynamic signal common to both sides of the junction, and the oscilloscope is left to measure only the changes in the junction voltage.
	www.lecroy.com /tm/products/DiffAmps/DA1850-55 (1034 words)

	DC Coupled Amplifiers for Audio
		The differential amplifier is one of the most important amplifying stages within linear circuit theory.
		Generally spoken the function of the differential amplifier is to amplify the difference between to signals.
		The principle of a differential amplifier stage is shown in figure 2.1.
	home.no.net /andiha/articles/audio/dcamp.htm (3116 words)

	Building a differential amplifier - Chapter 8: OPERATIONAL AMPLIFIERS - Volume III - Semiconductors (Site not responding. Last check: 2007-10-20)
		An op-amp with no feedback is already a differential amplifier, amplifying the voltage difference between the two inputs.
		The analysis of this circuit is essentially the same as that of an inverting amplifier, except that the noninverting input (+) of the op-amp is at a voltage equal to a fraction of V
		Another limitation of this amplifier design is the fact that its input impedances are rather low compared to that of some other op-amp configurations, most notably the noninverting (single-ended input) amplifier.
	www.allaboutcircuits.com /vol_3/chpt_8/9.html (390 words)

	Op-amp Varieties
		This amplifier uses both inverting and non-inverting inputs with a gain of one to produce an output equal to the difference between the inputs.
		It is a special case of the differential amplifier.
		For the difference amplifier, the voltage at the non-inverting input is
	hyperphysics.phy-astr.gsu.edu /hbase/electronic/opampvar6.html (154 words)

	Differential Amplifier : Analog Devices : Differential Amplifier (Site not responding. Last check: 2007-10-20)
		No other company is more committed to developing the Differential Amplifier that will make the digital future possible.
		ADI designs, manufactures and markets Differential 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 Differential Amplifier as well as over 10,000 other products that serve the needs of more than 60,000 customers worldwide.
	www.analog.com /differential_amplifier.html (278 words)

	www.fastmoneyhappens.com/auction.html - Oscilloscope by Tektronix, Inc.
		Meanwhile, the vertical amplifier is driven by an external voltage (the vertical input) that is taken from the circuit or experiment that is being measured.
		The amplifier drives with vertical deflection plates with a voltage that is proportional to the vertical input.
		The vertical amplifier and timebase controls are calibrated to show the vertical distance on the screen that corresponds to a given voltage difference, and the horizontal distance that corresponds to a given time interval.
	www.fastmoneyhappens.com /artifacts/oscilloscope.html (4216 words)

	Differential Amplifier Design (Site not responding. Last check: 2007-10-20)
		This is the diagram of the differential amplifier you have to design.
		We have shown the results for the differential amplifier in the design document to just give you an idea on how to go about things.
		The symbol for the above Differential Amplifier is created and then the following circuit is used for simulating the circuit.
	www.egr.msu.edu /~zhangjic/Lab/Lab4/4a.html (793 words)

	Operational amplifier, circuit opretional amplifier, operational amplifier tutorial (Site not responding. Last check: 2007-10-20)
		The term operational amplifier or "op-amp" refers to a class of high-gain DC coupled amplifiers with two inputs and a single output.
		The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low...
		operational amplifier, amplifier whose output voltage is proportional to the negative of its input voltage and that boosts the amplitude of an input.
	www.vanforcar.com /operational-amplifier.html (1028 words)

	AM502 Differential Amplifier (Site not responding. Last check: 2007-10-20)
		The AM502 is particularly suited to to sensor signal amplification or applications where one side of the measured signal is not ground.
		For example, the AM502 can amplify small voltage drops across resistors to monitor current flow to the bandwidth of the amplifier.
		Adjustable filtering (with differential amplification) permits the AM502 to emulate different loop filters on the differential phase comparator outputs in a phase locked loop design.
	www.test-equipment.net /Tek/TM500/am502.htm (124 words)

	Differential line - Computing Reference - eLook.org
		A differential amplifier at the receiver subtracts the inverted signal from the normal signal to yield a signal proportional to V. This subtraction is intended to cancel out any noise induced in the wires, on the assmption that the same level of noise will have been induced in both wires.
		Twisted pair wiring is often used to try to ensure that this is the case.
		The RS-422 serial line standard specifies differential drivers and receivers, whereas the earlier RS-232 standard does not.
	www.elook.org /computing/differential-line.htm (129 words)

	Differential Amplifiers (Site not responding. Last check: 2007-10-20)
		This amplifier is also referred to as a differential-input single-ended output amplifier.
		A differential amplifier is shown in figure 6.18.
		Two buffer amplifiers are commonly added to remove this limitation and form the simple instrumentation amplifier in figure 6.19.
	www.phys.ualberta.ca /~gingrich/phys395/notes/node110.html (256 words)

	Encyclopedia: Integrated circuit (Site not responding. Last check: 2007-10-20)
		In electronics, a vacuum tube (American English) or (thermionic) valve (British English) is a device generally used to amplify, or otherwise modify, a signal.
		In physics, the solid state is one of the three phases of matter (solid, liquid, and gas).
		A 741 operational amplifier in a TO-5 metal can package An operational amplifier or op-amp is a very high-gain amplifier which has two inputs, one inverting (âˆ’) and one non-inverting (+).
	www.nationmaster.com /encyclopedia/Integrated-circuit (7836 words)

	Opamp Differential Amplifier
		The differential amplifier has a unique feature that many circuits don’t have - two inputs.
		This circuit amplifies the difference between its input terminals.
		The differential amp reject the noise and rescue the signal.
	www.ecircuitcenter.com /Circuits/opdif/opdif.htm (432 words)

	BJT Differential Amplifier
		Look under the hood of most opamps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit - the differential amplifier.
		A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs.
		Simply follow a differential amplifier with another differential amplifier.
	www.ecircuitcenter.com /Circuits/BJT_Diffamp1/BJT_Diffamp1.htm (1057 words)

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