ADF7020 RF Port Impedance Values for Matching Purposes:    AN-764-Analog Device Application Notes  (app note added 6/06) 

Agilent TS-5400 Series II Automotive Electronics Functional Test System:    Agilent Application Note   (added 6/06)

Amplifying High-Impedence Sensors: Photodiode Example:    Microchip Application Note Published 8-Oct-04   (app note added 2/06)

AN-10-004  Diminutive Impedance-Matching Splitters:    Application Note MiniCircuits.com  (app note added 6/07)

AN-70-001  Fixed attenuators help minimize impedance mismatches:    Application Note MiniCircuits.com  (app note added 6/07)

AN-764: ADF7020 RF Port Impedance Values for Matching Purposes :    AN-764-Analog Device Application Notes  (app note added 6/06) 

AN951: Amplifying High-Impedence Sensors: Photodiode Example:    Microchip Application Note Published 8-Oct-04   (app note added 2/06)

App Note 10 - Op Amp Output Impedance:    Apex Microtechnology Corp App Note (added 6/06)

Audio-test accessory isolates and matches loads:    3/16/06  EDN Design Ideas  /  (added 10/06)  This low-cost, switchable, dual-impedance transformation circuit comprises a single conventional transformer and two minimum-loss pads.

Bipolar current source maintains high output impedance at high frequencies:    12/5/2005  EDN Design Ideas  / (added 05/07)    Use line-receiver/amp ICs to build high-frequency constant-current sources.

Diminutive Impedance-Matching Splitters:    Application Note MiniCircuits.com  (app note added 6/07)

Fast Current Feedback Amplifiers Tame Low Impedance Loads:    DN132  Design Notes (Linear Technology) (app note added 1/06)

Fixed attenuators help minimize impedance mismatches:    AN-70-001  Application Note MiniCircuits.com  (app note added 6/07)

High Input Impedance DC Summing Amplifier:    Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

High Input Impedance Precision DC Summing Amplifier:    Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

High Voltage Amplifier Drives Piezo Tubes:    12/07)/2004  EDN-Design Ideas  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 a -3-dB bandwidth of 6 kHz. It offers a low-cost alternative to commercial drivers.  (added 10/05)

High-impedance buffer amplifier's input includes ESD protection:    9/28/2006    EDN Design Ideas  / (added 05/07)    Diodes and guard traces suppress high-voltage static-discharge transients.

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 releasing air out of the tire being measured...(schematic added 6/07)

Impedance Transformer Flags Failed Fuse:    12/17/04 EDN Design Ideas  /  (added 5/05)  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 impedance of an electromagnetic sensor. Traditional fault-detection circuits sense the voltage difference developed across an open fuse, leakage current flowing through......

Line Driver Economically Synthesizes Impedance:    01/06/94 EDN-Design Ideas  / (added 6/06) 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 output. The principal drawback of the conventional circuit is that the single op amp must deliver twice the needed output voltage because of the large voltage drop across the output resistor. The circuit in Fig 1is similar to the famous Howland current pump but has different resistor values. To calculate the output resistance, RO, short the input to ground. Then....

Low Offset Summing Amplifier:    Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 63/06)

Low Voltage High Input Impedance Precision DC Summing Amplifier:    Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Measuring Characteristic Impedance of Short Rambus Motherboard Traces and Small-Outline RIMMs:    Agilent Application Note   (added 6/06)

Op Amp Output Impedance - App Note 10:    Apex Microtechnology Corp App Note (added 6/06)

Variable Amplifier Impedance:    idea of being able to vary the output impedance of a power amplifier (added 6/06)