Amplifier Circuit

Op_amp_with_FET_AGC_circuit_

Published:2009/7/19 21:10:00 Author:Jessie

Op amp with FET AGC circuit (courtesy Motorola Semiconductor Products Inc.).   (View)

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Simple_differentiator_using_an_ECG941_941D_941M_operational_amplifier

Published:2009/7/19 21:09:00 Author:Jessie

Simple differentiator using an ECG941/941D/941M operational amplifier. Typical supply voltage is ±15volts (courtesy GTE Sylvania Incorporated).   (View)

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Feedforward_frequency_compensation_circuit_using_an_AD101A_201A_301A_op_amp

Published:2009/7/19 21:09:00 Author:Jessie

Feedforward frequency compensation circuit using an AD101A/201A/301A op amp. Typical supply voltage is ±15 volts (courtesy Analog Devices, Inc.).   (View)

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Inverting_amplifier_using_an_ECG941_941D_941M_operational_amplifier

Published:2009/7/19 21:08:00 Author:Jessie

Inverting amplifier using an ECG941/941D/941M operational amplifier. Typical supply voltage is ±15 volts (courtesy GTE Sylvania Incorporated).   (View)

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Differential_amplifier_using_an_MC1539_op_amp

Published:2009/7/19 21:07:00 Author:Jessie

Differential amplifier using an MC1539 op amp (courtesy Motorola Semiconductor Products Inc.).   (View)

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GAIN_CONTROLLED_AMPLIFIER

Published:2009/7/10 3:36:00 Author:May

This single－chip circuit adjusts its audio gain according to the ambient nolse picked up by the mlcrophone。When operating in a quiet environment，the audio output is quiet，while a notsy environment resultsh a louder audio output。Audio to pm 13 is amplified by the variable－gain amplifier within the LM1894 IC，Audio from the microphone connected through 0.1μF capacitor to pin 6 controls the audio gain of thevariable-gam amplifier，The output appears on pm 11 andis taken off through an 0.1μ capacitor．   (View)

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ANALOG_PREAMP

Published:2009/7/10 3:28:00 Author:May

Combination of 5-kHz FET-chopper amplifier Q1-Q2 with transformer isolation of signal and system grounds gives low-cost analog instrumentation amplifier that will process millivolt DC signals while rejecting hundreds of volts of common-mode DC. Signal accuracy is 0.1% for inputs between 50 and 500mV. Input impedance is 4 megohms, drift is only 0.2μV/℃, and DC common-mode rejection rate is better than 120 dB. Low-impedance output of followers Q3－Q4-Q5 is sent through T1 to synchronousFET demodulator Q6-Q7,R7 adjusts system scaling.C.A.Walton,High-CMR,Low-Cost DC Instrumentation Preamp,EDN Magazine,Jan 15,1971,p 47－48.   (View)

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GATED_AMPLIFIER_FOR_RECEIVER

Published:2009/7/19 21:54:00 Author:Jessie

Input from f-m discriminator of ground receiver for neutron-detecting radiosonde contains two sub-carrier oscillator frequencies plus sleep un wanted pulses at audio blocking rate of 10 to 200 cps. Three-stage amplifier feeds amplified input signals to one-shot mvbr V3A-V3B for blocking of unwanted pulses. Out-put of gated amplifer V4 then contains only bursts of the two desired subcarrier frequencies.-L. Hillman and It. C. Haymes, Modifying a Telemetry System for Balloon-Borne Neutron Detection, Electronics, 34:11, p 60-63.   (View)

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BOOSTING_INPUT_IMPEDANCE

Published:2009/7/10 2:27:00 Author:May

Circuit shows how voltage gain in transistor amplifier can be exchanged for input impedance through use of negative feedback. At same time, voltage gain is made more independent of transistor parameters. -Feedback Increases Input Impedance, Electronics, 32:11, p 150-153.   (View)

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TRIODE_CATHODE_FOLLOWER

Published:2009/7/10 2:27:00 Author:May

Effective gain stability factor is approximately equal to reciprocal of omplification factor of tube.-G.M. Davidson and R. F. Brady, Unity-Gain AmpliGer Offers High Stability, Electronics, 33:9, p 66-67.   (View)

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CABLE_DRIVING_AMPLIFIER

Published:2009/7/10 2:24:00 Author:May

Used between wideband integrator and l85-ohm cable. With voltage gain of 3, bandwidth is l8 Mc without overshoot for pulse signcds.-S.Berglund and so Westerlund,Probes for Plosma Research with Wideband Integrators,Electronics,35:24,p 44-45.   (View)

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SECONDARY_EMISSION_PENTODE_CATHODE_FOLLOWER

Published:2009/7/10 2:21:00 Author:May

Circuit is enhanced by connecting dynode bock to cathode. Uses degenerative feedback, to achieve high-performance impedance transformation. Can be used to match high-impedance source to low-impedonce load.-E. J. Martin, Jr., How to Use the Secondary-Emission Pentode, Electronics, 33:41, p 60-63.   (View)

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CATHODE_EOLLOWER_WITH_099963_GAIN

Published:2009/7/10 2:20:00 Author:May

Used to couple high-impedance source to low-impedance output without attenuating or loading source signal. Output impedance is 50 ohms and respomse is lat within 3 db front d-c to 250 kc. Circuit delivers outputs from -140 to +210 v at -0.8 to +2 ma.Feedback through pentade helps maintain unity gain.-Cathode-Follower Gain Approaches Unity, Electronics, 31:1, p 94-96.   (View)

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TUNED_10_MC_AMPLIFIER_WITHOUT_NEU_TRALIZATION

Published:2009/7/10 2:18:00 Author:May

Low reverse transfer of cascade connection makes possible stable operation of commonsource fet. Transducer gains are 20.6 db and 25.3 db for 2N2497 and 2N2499 respectively.-Texas Instrumens Inc., Solid-State Communications, Mc Graw-Hill, N.Y., 1966, p 142.   (View)

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200_MC_FET_NEUTRALIZED_AMPLIFIER

Published:2009/7/10 2:11:00 Author:May

Capacitor C5 between dmin and gate provides neutralization by nullifying feedback. Neutrctlized stable gain at 250 Mc is 8 db. Bandwidth is 12 Mc.-P. E. Kolk and I. A. Maloff, The Field-Effect Transistor as High-Frequency Ampliler, Electronics, 37:31, p 71-74.   (View)

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MODIFIED_EMITTER_SQUARED_EOLLOWER

Published:2009/7/10 2:07:00 Author:May

Complementary transistor arrangement of feedback amplifier is modiled to reduce shunting effect of R3 by applying positive feedback voltage that artificially increases vctlue of R3.-T. K. Hemingway and J. Willis, Transistor Pairs Improve Emitter-Follower Performance, Electronics, 35:21, p 48-49.   (View)

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COMPOUNDED_EMITTER_FOLLOWER

Published:2009/7/10 2:01:00 Author:May

Compounded emitter-follower with feedback, operctted as complementary pair, gives higher input impedance, higher gain, and lower output impedance than conventionol eminerfollower.-T. K. Hemingway and J. Willis, Transistor Pairs Improve Emitter-Follower Performance, Electronics, 35:21, p 48-49.   (View)

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SMALL_SIGNAL_60_MC

Published:2009/7/10 1:56:00 Author:May

Epitaxial 2N743 is operated Gammon-emitter at signal frequency and Gammon-base for biasing. Unneufralized gain per stage is 17 db.-D. Hall, Using Epitaxial Transistors in Switching and R.F Circuits, Electronics, 34:13, p 52-53.   (View)

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CASCODE_FOLLOWER

Published:2009/7/10 1:54:00 Author:May

Output is 20 v peak-to-peak into 1,000 ohms, down to 5 cps, with high stability.-R. W. Johnson, Circuit with a Twist: The cascode 36:49,p 69－70.   (View)

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FET_SOURCE_FOLLOWER

Published:2009/7/10 1:53:00 Author:May

Voltage-divider biasing increases input impedance. R3 provides negative feedback.-B. Down, Using Feedback in FET Circuit to Reduce Input Capacitance, Electronics, 37:31, p 63-65.   (View)

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