US PATENT SUBCLASS 330 / 260
.~.~ Having signal feedback means
Current as of:
June, 1999
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330 /
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AMPLIFIERS
250
DF
WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR)
{21}
252
DF
.~ Including differential amplifier {9}
260
.~.~ Having signal feedback means
DEFINITION
Classification: 330/260
Having signal feedback means:
(under subclass 252) Subject matter wherein a portion of the electrical signal output energy is applied to the input of the amplifier.
(1) Note. There is a shared impedance for the input and output circuits involved.
(2) Note. The amplifier in this subclass may be any stage or group of stages of a cascaded amplifier.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9, for amplifiers with periodic switching input-output comparison including those with feedback circuits.
75+, appropriate subclasses for vacuum tube signal feedback amplifiers.
265, for signal feedback in complementary push-pull amplifiers.
271, for signal feedback in push-pull amplifier. 282, for signal feedback in gain control circuit.
291, for feedback in other transistor amplifiers.
