US Patent No: 4,994,730

Number of patents in Portfolio can not be more than 2000

Current source circuit with complementary current mirrors

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Abstract

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A current source circuit capable of generating two currents of opposite polarities. In order to generate the two currents, the circuit comprises a current source stage including a current mirror and feeding a first output current and an inverter stage connected to the source stage and generating a second output current with opposite polarity with respect to the first. The inverter stage comprises a current mirror and a variable current source defining a control electrode. In order to eliminate the differences in the amplitude of the output currents, the inverter stage comprises a memory element connected to the control electrode so as to store an electrode controlling signal. Switch elements are furthermore interposed between the first output and the second output so as to short-circuit them during the trimming step so that the two output currents are equal to one another while the memory element memorizes the control signal. This signal remains stored during the normal operation of the circuit.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SGS-THOMSON MICROELECTRONICS S.R.L.AGRATE BRIANZA1034

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Maloberti, Franco Torre D'lsola, IT 43 330
Rossi, Domenico Cilavegna, IT 30 300
Torelli, Guido Sant'alessio Con Vialone, IT 72 1157
Vacchi, Carla Pavia, IT 1 8
Viani, Ermes Casalgrande, IT 1 8

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SIEMENS AKTIENGESELLSCHAFT (2)
4,717,869 Controlled current source apparatus for signals of either polarity 11 1986
4,740,743 Switchable bipolar current source 14 1986
 
Bell Telephone Laboratories, Incorporated (1)
4,323,797 Reciprocal current circuit 7 1980
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (1)
4,706,013 Matching current source 13 1986
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
4,618,816 CMOS .DELTA.V.sub.BE bias current generator 23 1985
 
NORTEL NETWORKS LIMITED (1)
4,716,358 Constant current circuits 10 1986
 
Pioneer Electronic Corporation (1)
4,853,609 Distortion-free, opposite-phase current source 8 1983
 
Tokyo Shibaura Denki Kabushiki Kaisha (1)
4,325,019 Current stabilizer 10 1980
 
WESTERN ELECTRIC COMPANY, INCORPORATED (1)
4,544,878 Switched current mirror 11 1983
 
Zenith Electronics Corporation (1)
4,525,682 Biased current mirror having minimum switching delay 19 1984

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (3)
5,453,953 Bandgap voltage reference generator 19 1994
5,661,395 Active, low Vsd, field effect transistor current source 11 1995
6,249,164 Delay circuit arrangement for use in a DAC/driver waveform generator with phase lock rise time control 37 1998
 
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno (1)
5,952,874 Threshold extracting method and circuit using the same 3 1995
 
HYUNDAI ELECTRONICS INDUSTRIES CO., LTD. (1)
6,275,402 Precision fullwave rectifier 1 2000
 
INFINEON TECHNOLOGIES AG (1)
6,798,252 High speed sense amplifier 0 2002
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
5,563,549 Low power trim circuit and method 22 1995
 
RENESAS ELECTRONICS CORPORATION (1)
6,087,819 Current mirror circuit with minimized input to output current error 5 1998