Input buffer with impedance cancellation

Details Input buffer with impedance cancellation Input buffer with impedance cancellation

2011-04-12

2011-04-12

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S258000

Reexamination Certificate

active

07924096

ABSTRACT:
An exemplary negative impedance converting circuit for functioning as a voltage buffer and/or negating the impedance of a connected load. The negative impedance converting circuit includes inputs, outputs, a first transconductance stage and a second transconductance stage. The transconductance gain value of the first transconductance stage is greater than a transconductance gain value of the second transconductance stage. Exemplary embodiments of a reference voltage buffer using the negative impedance converting circuit are also described.

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Maximim Integrated Products, “Negative Resistor Cancels Op Amp Load”, Application Note 1868, Jan. 31, 2003.
Maxim Integrated Products, “Negative-Resistance Load Canceller Allows Voltage Reference to Drive Heavy Loads”, Application Note 815, Sep. 26, 2001.
Wikipedia, “Negative Impedance Converter”, retrieved from http://en.wikipedia.org/wiki/Negative—impedance—converter, entry last modified on Apr. 12, 2008.

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