IEEE Solid-State Circuits Magazine - Fall 2017 - 82

Payam Heydari

Neutralization
Techniques for
High-Frequency
Amplifiers
An overview

BACKGROUND ART-FOOTAGE FIRM, INC.

N

eutralization techniques to mitigate
the oscillatory currents/voltages in
amplifiers due to
instability goes as far back as the era
of vacuum tube amplifiers. For instan
ce, in U.S. patent 1,334,118, granted
on 16 March 1920 to C.W. Rice, it was
observed that "under certain conditions,
a device employing an incandescent
Digital Object Identifier 10.1109/MSSC.2017.2745858
Date of publication: 16 November 2017

82

FA L L 2 0 17

cathode, an anode, and a grid produces
oscillatory currents in the circuits associated therewith and in some cases
the oscillatory currents so produced
interfere with the efficient reception,
amplification and detection of the signals to be received." It then goes on by
stating that "in order to compensate for
the coupling due to the natural capacity between the grid 10 and anode 11
in Figure 1(a), which is represented by
the dotted condenser 12, an electromotive force, equal and opposite to that
impressed, is applied to the grid circuit

IEEE SOLID-STATE CIRCUITS MAGAZINE

through the condenser 13, upon the grid
from the anode 11 across the capacity
12." [See Figure 1(a).]
The same phenomenon was later
observed in transistor amplifiers. For
example, the U.S. patent 2,901,558,
granted on 25 August 1959 to R.R.
Webster "relates to semiconductor
amplifier circuits and more particularly to a method of neutralizing the
effects of interelectrode capacitance
in semiconductor amplifier devices."
Next, it introduces "a neutralization
circuit, where the feedback network

1943-0582/17©2017IEEE



Table of Contents for the Digital Edition of IEEE Solid-State Circuits Magazine - Fall 2017

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