公开(公告)号：CA992159A

公开(公告)日：1976-06-29

申请号：CA170058

申请日：1973-04-24

Applicant: IBM

Inventor： HOFFMAN CHARLES R

IPC: H04B3/06 ,  H04B3/14 ,  H04L25/04

公开(公告)号：FR2335888A1

公开(公告)日：1977-07-15

申请号：FR7635278

申请日：1976-11-17

Applicant: IBM

Inventor： CRANFORD HAYDEN C JR ,  HOFFMAN CHARLES R

IPC: H03F1/30 ,  G05F3/20 ,  G05F3/24 ,  H01L21/822 ,  H01L21/8236 ,  H01L27/04 ,  H01L27/088 ,  H01L29/78 ,  H03F3/345 ,  H03F3/45 ,  G05F1/56

公开(公告)号：IT7925853D0

公开(公告)日：1979-09-20

申请号：IT2585379

申请日：1979-09-20

Applicant: IBM

Inventor： CONNER DAVID E ,  HOFFMAN CHARLES R ,  LAAKSO MELVIN T

IPC: G06F13/00 ,  G06F11/20 ,  H04L12/423 ,  H04L12/437 ,  H03K

公开(公告)号：FR2384383A1

公开(公告)日：1978-10-13

申请号：FR7804185

申请日：1978-02-08

Applicant: IBM

Inventor： HOFFMAN CHARLES R ,  NUNNERY WILLIAM B

IPC: H03G11/00 ,  H03F3/04

公开(公告)号：IT1165313B

公开(公告)日：1987-04-22

申请号：IT2585379

申请日：1979-09-20

Applicant: IBM

Inventor： CONNER DAVID E ,  HOFFMAN CHARLES R ,  LAAKSO MELVIN T

IPC: G06F13/00 ,  G06F11/20 ,  H04L12/423 ,  H04L12/437 ,  H03K

公开(公告)号：CA1124813A

公开(公告)日：1982-06-01

申请号：CA332646

申请日：1979-07-27

Applicant: IBM

Inventor： CONNER DAVID E ,  HOFFMAN CHARLES R ,  LAAKSO MELVIN T

IPC: G06F13/00 ,  G06F11/20 ,  H04L12/423 ,  H04L12/437 ,  H04Q1/20

Abstract: RECEIVE/BYPASS CIRCUIT FOR SUBSYSTEMS IN POLLING SYSTEM A polling system includes a central processor and a plurality of subsystems connected in a loop to the central processor. A receive/bypass circuit in each subsystem includes a depletion mode field effect transistor having its drain and source electrodes connected in series in a bypass line at the subsystem. A control circuit is connected to a polling signal input line at each subsystem. When the subsystem has power, the control circuit routes the polling signal to a terminal device in the subsystem while establishing a conduction-inhibiting voltage at the gate electrode of the field effect transistor. When the subsystem is unpowered or out of service, a switching transistor in the control circuit isolates the terminal device from the polling signal input line. The polling signal bypasses an unpowered subsystem through the unbiased field effect transistor in the bypass line. RA9-77-009

公开(公告)号：FR2374772A1

公开(公告)日：1978-07-13

申请号：FR7733127

申请日：1977-10-27

Applicant: IBM

Inventor： HOFFMAN CHARLES R

IPC: H03F1/34 ,  H03F1/56 ,  H03F3/16 ,  H03F3/34 ,  H03F3/345 ,  H03F3/393 ,  H03F3/45 ,  H03F3/04 ,  H01L27/06

Abstract: In the application of analog type circuits to semiconductor chips for large scale circuit integration, a substantial improvement in the size of an amplifier circuit on the chip can be obtained by use of only active components on the chip. The described circuit is designed for any desired amplification factor and this factor can be maintained substantially uniform from chip to chip despite wide variations in the characteristics of comparable components between different semiconductive chips. The analog amplifier includes a high gain operating amplifier and a feedback-input circuit having only active components and which can be designed to reduce the gain of the operating amplifier to any desired value.