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Amplifier Circuits:  Hi Impedance
Amplifier -- Main Page         
Last Updated on: Thursday, April 07, 2016 01:01 PM

Circuits Designed by Dave Johnson, P.E. :

  • CMOS Logic Inverter Amplifier Characteristics  -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . [Circuit by David A. Johnson P.E.,  02/11/02]

  • High Impedance JFET Buffers  -  I have used these circuits many times.  They are great when you need a low gain AC signal Amplifier with a very high input impedance.  It is good to beyond 50MHz . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/11/06]


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

ADF7020 RF Port Impedance Values for Matching Purposes -  AN-764-Analog Device App Note -   …

 

Agilent TS-5400 Series II Automotive Electronics Functional Test System -  Aligent Application Note…

 

Amplifying High-Impedence Sensors: Photodiode Example -  Microchip Application Note Published 8-Oct-04  …

 

AN-10-004  Diminutive Impedance-Matching Splitters -  Application Note MiniCircuits.com…

 

AN-70-001  Fixed attenuators help minimize impedance mismatches -  Application Note MiniCircuits.com…

 

AN-764: ADF7020 RF Port Impedance Values for Matching Purposes  -  AN-764-Analog Device App Note -   …

 

AN951: Amplifying High-Impedence Sensors: Photodiode Example -  Microchip Application Note Published 8-Oct-04  …

 

Audio-test accessory isolates and matches loads -  03/16/06  EDN Design Idea   This low-cost, switchable, dual-impedance transformation circuit comprises a single conventional transformer and two minimum-loss pads… [by Richard M Kurzrok, RMK Consultants, Queens Village, NY]

 

Bipolar current source maintains high output impedance at high frequencies -  12/05/05  EDN Design Idea   Use line-receiver/amp ICs to build high-frequency constant-current sources… [by Alex Birkett, University College London, Hospital National Health Service, London, UK]

 

Characteristics of CMOS Logic Inverter Amplifiers -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/11/02]

 

CMOS Logic Inverter Amplifier Characteristics -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . . [Circuit by David A. Johnson P.E.,  02/11/02]

 

Diminutive Impedance-Matching Splitters -  Application Note MiniCircuits.com…

 

Fast Current Feedback Amplifiers Tame Low Impedance Loads -  DN132  Design Notes (Linear Technology)…

 

Fixed attenuators help minimize impedance mismatches -  AN-70-001  Application Note MiniCircuits.com…

 

High Impedance JFET Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal Amplifier with a very high input impedance.  It is good to beyond 50MHz . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/11/06]

 

High Impedance Voltmeter -  This circuit is designed to provide an inexpensive way to to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multimeter. The circuit is specifically designed for testing phototransistors when they are used in the circuits shown at this site. It has a very high input impedance that will not "Load Down" the sensor that is being checked… [from Rob Paisley's Model Train web site]

 

High Impedance, High CMR, ±10 V Analog Front End Signal Conditioner for Industrial Process Control and Automation  -  Follow the instructions contained in the Readme file for installing and using the evaluation software.,Functional Block Diagram Figure 4 shows a functional block diagram of the test setup… [Analog Devices-Circuits from the Lab]

 

High Input Impedance DC Summing Amplifier -  Circuit Ideas for Designers App Note - … [Advanced Linear Devices, Inc]

 

High Input Impedance Precision DC Summing Amplifier -  Circuit Ideas for Designers App Note - … [Advanced Linear Devices, Inc]

 

High-Impedance Buffer Amplifier's Input includes ESD Protection -  09/28/06 EDN Design Idea   Diodes and guard traces suppress high-voltage static-discharge transients… [by Eugene Palatnik, Waukesha, WI]

 

High-impedance voltmeter -  An ideal voltmeter has infinite input impedance, meaning that it draws zero current from the circuit under test.This way, there will be no "impact" on the circuit as the voltage is being measured. The more current a voltmeter draws from the circuit under test, the more the measured voltage will "sag" under the loading effect of the meter, like a tire-pressure gauge…

 

High-voltage Amplifier drives piezo tubes -  12/07/04  EDN Design Idea   Piezoelectric tubular positioners that drive manipulators in scanning tunneling microscopes require high-voltage, low-current drive circuits. The circuit in Figure 1 can drive high-resistance, low-capacitance piezoelectric loads at … [by Bipin Duggal, Netaji Subhas Institute of Technology, New Delhi, India]

 

High-voltage CMOS Amplifier enables high-impedance sensing with a single IC -  06/30/14  EDN Design Idea   LTC Design Note 513: Accurately measuring voltages requires minimizing the impact of the instrument connection to the tested circuit. Typical digital voltmeters (DVMs) use 10MΩ resistor networks to keep loading effects to an inconspicuous level, but even this can introduce significant error, particularly in higher voltage circuits that involve high resistances.… [Linear Technology Design Note 513[by John Munson]

 

Impedance Measurement Monitors Blood Coagulation -  Analog Devices-Analog Dialogue… [by Berney, Helen and O'Riordan, J.J.]

 

Impedance transformer flags failed fuse -  12/17/04  EDN Design Idea   Figure 1depicts a circuit that detects the opening of a miniature circuit breaker or high-rupture-capability fuse in a high-reliability telecommunications power supply. The circuit generates an alarm when a failure changes the impe… [by Kevin Ackerley, Future Electronics, Vancouver, BC, Canada]

 

JFET High Impedance Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . [Circuit by David Johnson P.E.,  07/11/06]

 

Line Driver Economically Synthesizes Impedance -  01/06/94 EDN Design Idea   The line-driver circuit in Fig 1 uses a second op Amp to synthesize the output impedance. The conventional line-driver circuit employs a single op Amp having a resistor whose resistance is equal to the desired impedance in series with the op Amp's… [by Victor Koren, Orckit Communication Ltd, Ramat-Gan, Israel]

 

Low Voltage High Input Impedance Precision DC Summing Amplifier -  Circuit Ideas for Designers App Note - … [Advanced Linear Devices, Inc]

 

LTC Design Note: High-voltage CMOS Amplifier enables high-impedance sensing with a single IC -  06/30/14  EDN Design Idea   Accurately measuring voltages requires minimizing the impact of the instrument connection to the tested circuit. Typical digital voltmeters (DVMs) use 10MΩ resistor networks to keep loading effects to an inconspicuous level, but even this can introduce significant error, particularly in higher voltage circuits that involve high resistances.… [Linear Technology Design Note 513[by John Munson]

 

Measuring Characteristic Impedance of Short Rambus Motherboard Traces & Small-Outline RIMMs -  Aligent Application Note…

 

Variable Amplifier Impedance -  Figure 1 shows two Amplifiers (shown as opamps) , with (a) being conventional voltage drive, and (b) is current drive. The output impedances are in the order of zero ohms and infinite ohms in each case (this IS a theoretical discussion at the moment!). The gain will appear to be exactly the same for each into an 8 ohm resistive load,… [Rod Elliott (ESP)]

 

Variable Amplifier Impedance -  This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main Amplifier is used for listening to music, then when the push to talk switch is pressed, the Amplifier is switched to the voice signal… [Andy Collison's website]


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