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Патент USA US2411517

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2,411,517
Patented Nov. 26, 1946
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UNITED! STATE 5 PAT
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2,411,517
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OFFICE;
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COUPLING AMPLIFIER’ ' '
HenriG; Busignies, Forest Hills,v N; Y., assignor'to'
Federall Telephone‘ and Radio Corporation,
Newark, N. J'., a» corporationof Delaware;
Application January 16, 1943, Serial,No..4'Z2,589.>
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3 Claims.
2
1
This invention relates to improvements in
coupling ampli?ers, and more particularly to such
ampli?ers to be used between anginput circuit
ampli?er is assured.
For example, if at any
gram of a preferred form of coupling ampli?er
proper adjustment of resistors 28 and 3!] will be
chosen instant the polarity of the input lead I4
is positive and the polarity of the input lead I6 is
negative, the coupling will act as an ampli?er. A
and a balanced output circuit, as between a direc
negative potential will exist on the output lead I8
tive antenna and its transmission line.
due to phase reversal through the tube III while
An object of this invention is to provide a novel
a positive potential will appear on the output lead
coupling ampli?er between a balanced or a par
20 due to phase reversal through the tube I2.
tially unbalanced input circuit and a balanced
The potential on the output lead I8 derived from
output circuit.
More speci?cally, the invention is directed to a 10 the cathode of tube I2 through condenser 44 will
likewise be negative, while the potential on the
novel coupling circuit which ampli?es a bal
lead 20 derived‘ from the cathode on the tube I 0
anced input, but inherently prevents the ampli
through condenser 42 will be positive. Thus,
?cation and through passage of parallel input
when a balanced load is placed upon the leads
currents or voltages to the output circuit.
In another sense, the invention provides a 15 I4 and It, a balanced output on the leads I8 and ,
20 results.
neutralized push-pull ampli?er which blocks out
However, if the potential on both leads I4 and.
unbalanced input currents but ampli?es balanced
I6, is for example, positive, the ampli?er will act
input currents.
to block the passage of current, rather than
These and other objects and advantages of
the present invention will appear from the fol 20 amplify it. This is} due to‘ the fact that while,
in such a case, the potential on the lead I8 derived
lowing description of a preferred embodiment
from the anode of the tube III will be negative,
thereof, taken in connection with the following
the derived voltage values as determined by‘the
drawing in which the single ?gure is a circuit dia
according to the present invention.
, 25
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In the preferred form of invention illustrated,
I use two vacuum tubes I0 and I2 which may be
of such Value that this potential will be neu
tralized by the positive potential derived from the
cathode of the tube I2. Likewise, by properly
proportioning resistors 26 and 32, the negative
triodes, as illustrated, generally connected in
potential on the lead 29 derived from the anode
push-pull relationship. Input lead I4 will be con
nected to the grid of triode III, while input lead 30 of the tube I2 will be neutralized by-the potential
derived from the cathode of the tube III. The
I6 will be connected to the grid of triode I2. The
amount of resulting neutralization will, of course,
output leads I8 and 20 are respectively connected
depend upon the amount of unbalance present
to the anodes of the tubes In and I2 through
in the input circuit.
suitable condensers 22 and 24. In the cathode
While the invention has beenparticularly de
' circuit of each tube is placed a resistor, such as 35
scribed in connection with an ampli?er using
the resistors 26 and 28, the common mid-point _
between these resistors being grounded.’ The
triodes, it can be adapted for use with other _
anodes of the two tubes are seriallypconnected
with one another through resistors 30 and 32,
multi-electrode tubes. The described ampli?er
is particularly well adapted for, use as coupling
the mid-point connection of which is grounded 40 units between direction ?nding antennae and
transmission lines, in directive antenna'coupling
for high frequency currents through the con
denser 34. A high voltage source indicated at 35
will also be connected to the mid-point between
resistors 30 and 32. Grid-leak resistors 38 and 40
are respectively connected between the individual 45
systems and generally in all balanced types of
transmission circuits in which the transmission
of parallel voltages or currents or straight recep
grids and ground.
In addition to the circuit connections‘just out
lined, it will be also noted that each cathode of
order to comply with the statutes, I have illus
trated and described a single speci?c embodiment
of my invention, it is contemplated that various
the individual tubes is respectively connected
changes may be made in the circuit as will appear
to the outputlead of the opposite'tube.
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tion is to be avoided.
Furthermore, while, in 7
For 50. obvious to those skilled in this art and it is there
fore to be clearly understood that this descrip
example, they cathode ‘of tube I0 is connected
tion is made by way of example and not, as a limi- through condenser 42 to the output lead 20, while
‘ tation on the scope of my invention as set forth .
the cathode of tube I2 is connected through con
in the objects and the accompanying claims.
denser 44 to the output lead] 8. .By means of this
cross-connection, a balanced output from the 56
I claim:, '
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2,411,517
3
anode of the other electron discharge device,
a second pair of condensers, one condenser con
1. A coupling ampli?er comprising a pair of
triodes, input leads connected to the grids of
said triodes, resistors individually connecting each
cathode to ground, a pair of output leads, means
for capacitatively coupling one output lead to the
anode of one triode and the cathode of the other
triode, means for capacitatively coupling the other
output lead to the anode of the other triode and
the cathode of the one triode, and means includ
ing individual resistors and a common condenser
necting the one output lead to the cathode of
the other electron discharge device and the other
condenser connecting the other output lead to the
cathode of the one electron discharge device, a
?rst pair of resistors serially connected between
said anodes, a second pair'of resistors serially
connected between said cathodes, and means for
10 coupling the mid-points between said pairs of
for connecting each anode to ground.
2. A coupling ampli?er, including in~combina~
tion a pair of electron discharge devices each hav
ing an anode, a cathode and a grid, a pair of
input leads, one connected to each grid, a pair
of output leads, a ?rst pair of condensers, one
condenser connecting one outlet lead to the anode
of one electron discharge device and the other
condenser connecting the other output lead to the ‘
' resistors.
3. The combination according to claim 2, in
which said last means is a condenser, in com
bination with means for grounding the mid-point
between said second pair of resistors, and a high
potential source connected to the mid-point be
tween said ?rst pair of resistors.
HENRI G. BUSIGNIES.
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