公开(公告)号：US3597696A

公开(公告)日：1971-08-03

申请号：US3597696D

申请日：1969-09-11

Applicant: VAPOR CORP

Inventor： RABINDRAN KARAVATTUVEETIL GEOR

IPC: H03F3/393 ,  H03F3/38 ,  H03G3/16

CPC classification number: H03F3/393

Abstract: A stable high-gain solid-state DC amplifier circuit comprising a low-pass filter connecting a DC supply to an input chopper (either shunt or series connected) that is AC coupled to a highgain noninverting AC amplifier; the amplifier is in turn AC coupled to an output chopper (again, either series or shunt connected) connected to a storage capacitor, with a negative feedback circuit from the storage capacitor back to the low-pass filter in the input of the input chopper. The two choppers are driven in effective phase opposition, relative to each other, so that the feedback loop is not completely closed at any instant. For improved gain, the combination of a series chopper and a shunt chopper may be used at either end, or at both ends, of the amplifier circuit.

公开(公告)号：US3548155A

公开(公告)日：1970-12-15

申请号：US3548155D

申请日：1969-10-03

Applicant: VAPOR CORP

Inventor： RABINDRAN KARAVATTUVEETIL GEOR

IPC: G05D23/24 ,  H05B1/02

CPC classification number: G05D23/24 ,  G05D23/1912