Amplifier Circuit

DIFFERENTIAL_CASCODE

Published:2009/6/25 22:43:00 Author:May

Direct-coupled single-stage amplifier with differential input and output can be used in one or more stages of high-performance ampimers. Bipolar-JFET caseode arrangement offers significant increase in common-mode input resistance and CMRR as compared to conventional diff erential pair, with little or no degradation of other performance parameters. Differential-mode gain is 116, commdnmode input resistanee is greater than 100 gigohms, CMRR is greaterthan 160 dB, and current-source output resistance is greater than 1 gigohm. Article gives design equations.-R. C.Jaeger and G. A. Hellwarth, Differential Cascode Amplifier Offers Unique Advantages, EDNMag-azine, June 5,1974, p 78 and 80.   (View)

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80_MHz_WITH_INPUT_PEAKlNG

Published:2009/6/25 22:41:00 Author:May

Response of CA3040 video IC is extended beyond 80 MHz in simple circuit that includes adjustable input peaking coil. Response is flatwithin 3 dBto well below t MHz, for gain of about 32 dB.-E. M Noll, Linear IC Principles, Experiments, and Projects, Howard W. Sams, Indianapolis, IN,1974, p163 and 169.   (View)

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WIDEBAND_BUFFER

Published:2009/6/25 22:31:00 Author:May

Low input capacitance of 2N5485 FET makes compound series-feedback buffer serve as wideband unity-gain amplifier having high input impedance.- FET Data-book, National Semiconductor, Santa Clara,CA,1977, p 6-26-6-36.   (View)

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RAIN_ALARM

Published:2009/6/25 22:31:00 Author:May

The circuit uses four NAND gates of a 4011 package. In eachoscillator, while one gate is configured as a straightforward inverter, the other has one input that can act as a control input. Oscillator action is inhibited if this input is held low. The first oscillator (IC1a and IC1b) has this input tied low via a high value resistor (R1) that acts as a sensitivity control. Thus this oscillator will be disabled until the control input is taken high. Any moisture bridging the sensor track will so enable the output which is a square wave at about 10 Hz. This in turn will gate on and off the 500 Hz oscillator formed by IC1c and IC1d. This latter oscillator drives the loudspeaker via R6, the Darlington pair formed by Q1 and Q2, and resistor R7.   (View)

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CASCODE_RF_IF

Published:2009/6/25 22:31:00 Author:May

Uses half of SignetIcs 511 transistor array to provide voltage gain of about 10 over bandwidth of 2 MHz with output volt-age swing of 12V P-P. Design procedure is given. Circuit provides excellent isolation be-tween input and output.- Signetics Analog Data Manual, Signetics, Sunnyvale, CA,1971, p 746-747.   (View)

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168_MHz_BANDPASS

Published:2009/6/25 22:31:00 Author:May

Gain stage provides gain of 6 dB from 162 to 174 MHz. Skirt slope immediately outside passband decreases at 80 db/MHz. Uses dispersive-design surface-acous-tic-wave bandpass filter with 168-MHz center frequency, 7% bandwidth, and extremely steep skirt response. Parallel inductor at collector ter-minal matches capacitance of acoustic-wave device, and tapped inductor matches output terminal of filter to 50 ohms. Used in spread-spectrum communication receiver. Article cov-ers design and construction of filter on quartz substrate.-T.F.Cheek, Jr.,R.M.Hays,Jr.,and C.S.Hartmann, A Wide-Band Low-Shape-Fac-tor Amplifier Module Using an Acoustic Sur-face-Wave Bandpass Filter, IEEE Joumal of Solid-State Circuits, Feb. 1973, p 66-70.   (View)

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60_MHz_NARROW_BAND

Published:2009/6/25 22:30:00 Author:May

Signetics NE510/511 transistor array provides bandwidth of 0.5 MHz for 3dB down and noise figure of 7 dB for power gain of 30dB，Maximum output swing across 50 ohms is 300 mVRMS. Circuit is easily tuned.- Signetics Analog Data Manual. Signetics, Sunnyvale, CA,1977, p 749.   (View)

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SUMMING_AMPLIFIER

Published:2009/6/25 22:23:00 Author:May

Uses RCA CA3018 four-transistor array as current-mirror triad with low 4 mpedance buffered output, to serve as high-performance summing amplifier. Mea-sured harmonic distortion is less than 170 at voltage gains up to 50 and with output swing of 10V P-P. High output impedance of 51 kil-ohms can be buffered by Q2 connected as emitter-follower.-W.G.Jung. Monolithic-Triad Cument Summer, EDNIEEE Magazine, July 1,1971,p52.   (View)

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RC_COUPLED_DIFFERENTIAL

Published:2009/6/25 22:10:00 Author:May

Input signal is applied to base of first differential amplifier and pushpull output is obtained from pins 8 and 10 for transfer to inputs of second IC. Feedback is transferred through RC combination back to pin 6 of first IC. Gain is varied with AGO voltage ap-plied to pin 2 of first IC. Gain is over 60 dB with flat response from 100 Hz to 100 kHz.-E.M.Noll, Linear IC Principles, Experiments, and Projects, Howard W. Sams, Indianapolis, IN, 1974, p 89-91.   (View)

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25_MHz_BANDWIDTH_LOW__NOISE

Published:2009/6/25 22:09:00 Author:May

RCA CA3018 fourtransistor array is connected as two pairs of common-emitter emitter-follower combinations, with two feedback loops providing high DC stabilhy. One path goes from emitter of Q3 back to input, and other goes from collector of Q4 to collector of Q1. Values of C1, C2, and C3 give low-frequency cutoff (3 dB down) of 800 Hz.Upper cutoff is 32 MHz.-E.M.Noll, Linear IC Principles, Experiments, and Projects, Howard W. Sams, Indianapolis, IN,1974, p 165-168 and 174.   (View)

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50_dB_BROADBAND_VIDEO

Published:2009/6/25 22:08:00 Author:May

RCA CA3018 fourtransistor array is connected as two pairs of common-emitter emitter-follower combinations, with two feedback loops providing high DC stabilhy. One path goes from emitter of Q3 back to input, and other goes from collector of Q4 to collector of Q1. Values of C1, C2, and C3 give low-frequency cutoff (3 dB down) of 800 Hz.Upper cutoff is 32 MHz.-E.M.Noll, Linear IC Principles, Experiments, and Projects, Howard W. Sams, Indianapolis, IN,1974, p 165-168 and 174.   (View)

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RF_DIFFERENTIAL_AMPLIFIER

Published:2009/6/25 22:04:00 Author:May

Uses RCAC CA3028A linear IC to provide power gain ofabout 32 dB at frequencies up to about 120MHz，Values of tuned circuits deρend on frequency used Unmarked resistors are on IC -D.DeMaw、Vndelstanding Linear ICs、QST， Feb1977、p19   (View)

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POLARITY_IGNORlNG_VOLTAGE_FOLLOWER

Published:2009/6/25 22:02:00 Author:May

Absolute-value circuit is basically voltage follower A1 whose input is positive regardless of polarity of VIN. With positive input, inverting amplifier A2 is disconnected by D1. With negative input, inverting amplifier applies poshive input to voltage follower through D1. Output voltage is thus absolute value of input voltage.-R. J. Wincentsen, Absolute Value Circuit Uses Only Five Parts, EDN Magazine, Nov. 1,1972, p 44.   (View)

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VIDEO_ATTENUATOR

Published:2009/6/25 21:52:00 Author:Jessie

FETs in T attenuator provide optimum dynamic linear range for at-tenuation of video signals with ganged 1-meg-ohm pots. If complete turnoff is desired, atten-uatlon greater than 100 dB can be obtained at 10 MHz by using appropriate RF construction to minimize leakage. ON resistance of transistor (between drain and source) is less than 30 ohms.- FET Databook, National Semicon-ductor, Santa Clara, CA, 1977, p 6-26-6-36.   (View)

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PREAMP_F0R_O5_Hz_T0_2_MHz

Published:2009/6/25 21:50:00 Author:Jessie

Provides 11-dB gain over entire frequency range, with input impedance of 32 megohms. Q3 is GE-2 or HEP-52, and other transistors are SK3020 or HEP-53.-Circuits, 73Magazine, Jan. 1974, p 125.   (View)

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20_dB_VIDEO_LINE_DRIVER

Published:2009/6/25 21:50:00 Author:Jessie

RCA CA3100 wideband opamp and power transistor output stage together provide gain of 20 dB at video frequencies for driving 50-ohm line. Peak output voltage ranges from 8V at 1MHz to 1V at 8MHz Upper frequency limit for unity galn is about 38MHz．- Linear Integrated Circuits and MOS/FET's、″RCA Solid State Division,Somerville,NJ,1977,p 225-227   (View)

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50_MHz_POWER

Published:2009/6/25 21:49:00 Author:Jessie

Developed for use with 50 MHz microtransistor crystal oscillator,using additional GE microtransistor for boosting RF output to about 75 mW，Article covers construction with microcomponents and gives other microtransistor circuits for low-power amateur tadiouse and possible bugging applications，-B.Hoisington、Introduction to″Microtransistors,″73 Magazit， Oct.1974,p 24-30.   (View)

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CONSTANT_OUTPUT_IMPEDANCE

Published:2009/6/25 21:47:00 Author:Jessie

Pulse output stage gives output range from millivolts to 10 V P-P across 50 ohms while optimizing waveform characteristics of output pulse. With 2N2904 output transistors, circuit delivers 200 mA with 20-ms rise and fall times.-W. A. Palm, Pulse Amplifier Varies Amplitude, EDN Maga-zine, Aug. 5, 1978, p 76.   (View)

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20_MHz_WIDEBAND

Published:2009/6/25 21:33:00 Author:May

RCA CA3040 IC is connected for single-ended input and balanced output, with no resonant circuits. Gain is above 30 dB over wide frequency range.-E. M. Noll, Linear IC Principles, Experiments, and Proiects, Howard W. Sams, Indianapolis, IN, 1974, p 162-163 and 168.   (View)

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DIFFERENTIAL_PAIR

Published:2009/6/25 21:25:00 Author:May

Conventional differential amplifier circuit provides differential-mode gain of 96, common-mode input resistance of 500 megohms, CMRR of 106 dB, and current-source output resistance greater than 1 gigohm. Article gives design equations.-R. C. Jaeger and G. A.Hellwarth, Differential Cascade Amplifier Offers Unique Advantages, EDN Magazine, June 5, 1974, p 78 and 80.   (View)

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