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Class Information
Number: 330/157
Name: Amplifiers > Interstage coupling
Description: Subject matter wherein the amplifier is comprised of at least two amplifying devices in cascade, the two being in direct proximity in the cascaded circuit and wherein there are significant details or distinctive characteristics of the circuit by means of which the signal output of the preceding amplifying device is coupled to the signal input of the following cascaded amplifying device, or wherein the parameters or electrical characteristics of the output of the preceding device or the input of the following device, are claimed.

Sub-classes under this class:

Class Number	Class Name	Patents
330/172	Coupling from cathode	1
330/158	Coupling to cathode	1
330/160	Coupling to plate or auxiliary grid	0
330/181	D.c. coupled	1
330/162	Output coupling from grid	2
330/165	Transformer coupling	40
330/177	With coupling or blocking capacitor	2
330/174	With electromechanical transducer (e.g., piezoelectric crystal)	22
330/164	With electronic tube or diode in coupling circuit	1
330/175	With lattice or wheatstone bridge network in coupling circuits	1
330/176	With t, h, or pi network in coupling circuit	2

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6680647	Low noise amplifier circuit with phase matched switch topology	Jan. 20, 2004
6259298	Method and an arrangement for adapting from a DC point of view a first circuit to at least one second circuit	Jul. 10, 2001
5627486	Current mirror circuits and methods with guaranteed off state and amplifier circuits using same	May. 6, 1997
4131859	Method of compensation of intermodulation noise and devices for the implementing thereof	Dec. 26, 1978