公开(公告)号：EP2504921A4

公开(公告)日：2015-06-10

申请号：EP10832318

申请日：2010-11-22

申请人： HITTITE MICROWAVE CORP

发明人： TOKMAK SAVAS ,  EKEN YALCIN ALPER

IPC分类号： H03G3/30 ,  H03G1/00 ,  H04B1/06

CPC分类号： H03G3/3042 ,  G01R21/01 ,  H03G1/0035

摘要： A variable gain amplifier includes a plurality of amplification elements arranged to generate amplified representations of an RF input signal at a plurality of nodes. A plurality of controllable response elements each have an input coupled to a different one of the nodes to receive a different one of the amplified representations of the RF input signal. A scale factor generator is coupled to each of the controllable response elements. The scale factor generator receives a gain control signal and generates scale factor signals for varying the response of each of the controllable response elements such that as the scale factor generator sweeps through a full range of the gain control signal, the response of each of the controllable response elements is, in succession, increased smoothly to a peak and thereafter decreased smoothly to a lower level to produce a scaled output. A summing element is coupled to the controllable response elements for combining the scaled outputs of the controllable response elements to generate an output of the variable gain amplifier having a given gain range.

公开(公告)号：EP1645040A4

公开(公告)日：2007-12-26

申请号：EP04777806

申请日：2004-07-07

申请人： ANALOG DEVICES INC

发明人： GILBERT BARRIE

IPC分类号： H03F3/45 ,  H01P1/22 ,  H03G1/00 ,  H04B20060101

CPC分类号： H03G1/0035

摘要： An input stage receives a differential input signal at first and second input nodes and provides a differential output current at first and second output nodes. The differential output current includes a component taken from the input nodes through first and second impedances, and an additional component generated in response to a sample of the voltage of the differential input signal. A transconductance cell having cross-coupled inputs may generate the additional component of the output current.

公开(公告)号：EP1249069B1

公开(公告)日：2004-03-17

申请号：EP00984366.5

申请日：2000-12-14

申请人： ANALOG DEVICES, INCORPORATED

发明人： GILBERT, Barrie

IPC分类号： H03G1/00

CPC分类号： H03G1/0035 ,  H03G1/0088 ,  H03H11/24

摘要： An interpolator utilizes two ranks of transistors to generate a plurality of interpolator currents within the confines of a low power supply voltage. The first rank of transistors are underdriven, thereby generating a plurality of partially switched currents having shallow Gaussian-shaped functions. The partially switched currents are then spatially amplified by the second rank of transistors to reduce the overlap of the currents from adjacent transistors. The first rank of transistors are driven ratiometrically by the difference of two control currents, thereby eliminating errors caused by inaccurate resistors and current sources. A biasing op-amp senses the interpolator currents and servos the first rank of transistors, thereby regulating the interpolator currents to a value determined by a reference voltage which is temperature compensated. Thus, the biasing op-amp automatically compensates for temperature variations and manufacturing uncertainties in devices throughout the entire interpolator. A current generator utilizes a current mirror scheme and current replication techniques to cancel transistor alpha effects, thereby generating precise ratiometric drive currents from a low power supply voltage.

公开(公告)号：EP0543927B1

公开(公告)日：1999-01-20

申请号：EP91916310.5

申请日：1991-08-12

申请人： ANALOG DEVICES, INCORPORATED

发明人： GILBERT, Barrie

IPC分类号： H03G3/00 ,  H03G3/10

CPC分类号： H03G1/0035 ,  H03G7/06

公开(公告)号：EP0008913B1

公开(公告)日：1982-08-04

申请号：EP79301730.2

申请日：1979-08-23

申请人： FUJITSU LIMITED

发明人： Suzuki, Shinjiro ,  Yoshikawa, Tadashi ,  Otsuki, Tsuguo ,  Takeda, Masao ,  Kamoi, Nobuhisa ,  Satoh, Kazuo

IPC分类号： H03G1/04 ,  H03G3/30 ,  H04B1/00

CPC分类号： H04B3/145 ,  H03G1/0035 ,  H03G3/005 ,  H03G3/301

公开(公告)号：EP3278127A1

公开(公告)日：2018-02-07

申请号：EP16718596.6

申请日：2016-04-14

申请人： Allegro Microsystems, LLC

发明人： TOWNE, Jay, M. ,  SCHELLER, P., Karl ,  SHOEMAKER, Eric, G.

IPC分类号： G01R33/00 ,  G01R33/07

CPC分类号： G01R33/0041 ,  G01D5/145 ,  G01R33/0029 ,  G01R33/07 ,  G01R33/09 ,  H03F1/0216 ,  H03G1/0035

摘要： A circuit includes a current source having at least first terminal and a second, control terminal. The current source is configured to receive a current control signal at the control terminal and in response thereto generates a first current signal at the first terminal. The current control signal controls a current level of the first current signal. The circuit also includes at least one sensing element responsive to one or more sense parameters and having an input adapted to couple to the first terminal of said current source. The sensing element is configured to receive one or more current signals comprising at least the first current signal and in response thereto generates a sensed output signal at an output thereof. A corresponding method for operating the circuit is also provided.

公开(公告)号：EP2524425A1

公开(公告)日：2012-11-21

申请号：EP11732032.5

申请日：2011-01-03

申请人： Microchip Technology Incorporated

发明人： KOBAYASHI, Bun ,  SCHELL, Steven, W. ,  KIM, Yonghan, Chris ,  CHOW, Pei-Ming, Daniel ,  CHANG, MAU-CHUNG, Frank

IPC分类号： H03F3/00

CPC分类号： H03F3/195 ,  H03F1/0261 ,  H03F1/0277 ,  H03F1/302 ,  H03F1/34 ,  H03F3/72 ,  H03F2200/144 ,  H03F2200/18 ,  H03F2200/27 ,  H03F2203/7206 ,  H03F2203/7236 ,  H03G1/0035

摘要： A step gain amplifier has an amplifier with an input and an output, and a bias circuit connected to the input and to a bias node. A passive feedback circuit using only passive elements connects the output to the input. A control circuit is connected to the bias circuit at the bias node.

公开(公告)号：EP0677933A3

公开(公告)日：1995-12-13

申请号：EP95103087.3

申请日：1995-03-04

申请人： STUDER Professional Audio AG

发明人： Zwicky, Paul ,  Sauter, Lorenz ,  Huber, Robert ,  Fisch, Peter

IPC分类号： H04H7/00

CPC分类号： H04H60/04 ,  H03G1/0035 ,  H03G3/02

摘要： Um bei Vorrichtungen zur Betätigung eines Stellgliedes (4) für die Verarbeitung eines Audiosignales, mit einem Eingabeelement (2) die Reaktion auf die Veränderungen des Stellgliedes zu verbessern, soll eine Auswerteeinheit (9), die zur Ausgabe einer Rückmeldung an das Eingabeelement ausgebildet und angeordnet ist, vorgesehen werden. So könnten erreichte Sollwerte direkt beispielsweise im Eingabeelement fühlbar gemacht werden können.

公开(公告)号：EP0543927A1

公开(公告)日：1993-06-02

申请号：EP91916310.0

申请日：1991-08-12

申请人： ANALOG DEVICES, INCORPORATED

发明人： GILBERT, Barrie

IPC分类号： H03G3 ,  H03G1 ,  H03G7

CPC分类号： H03G1/0035 ,  H03G7/06

摘要： Amplificateur à gain variable comprenant un atténuateur en échelle (20) auquel un signal d'entrée est appliqué. Les noeuds d'échelle développent des signaux qui s'atténuent progressivement (à niveaux réduits) correspondant au signal d'entrée. Des étages (gm) (36) à transconductance réglables sont connectés respectivement à des noeuds d'échelle, et un composite de leurs sorties est dirigé vers un amplificateur de sortie à gain fixe (28). Les transconductances des étages gm (36) sont commandées par un circuit à interpolation (30) qui dirige un courant de commande vers chacun des étages gm (36) en séquence, en réponse à un signal de commande analogique alors que celui-ci fluctue entre des valeurs d'atténuation maximum et minimum. Le courant de commande active en séquence chaque étage gm (36), augmentant la transconductance de chaque étage d'effectivement zéro au maximum, puis la ramenant à zéro, par un procédé de chevauchement, de manière à abaisser progressivement le gain global de l'amplificateur à gain variable alors que le signal de commande balaie sa plage de commande.

公开(公告)号：EP0163461A3

公开(公告)日：1987-05-27

申请号：EP85303482

申请日：1985-05-17

申请人： Donovan, John S.

发明人： Donovan, John S.

IPC分类号： H03F03/26

CPC分类号： H03G3/10 ,  H03F3/265 ,  H03G1/0035

摘要： A push pull, small signal amplifier arrangement which employs Metal Oxide Semiconductor/Field Effect Transistors. Depletion type (14,16) employed in the first stage while enhanced type (54, 56) may be employed in the second stage. The two stages are directly connected together and means for controlling the gain of both stages simultaneously are included. Also disclosed is a number of configurations of various applications.