# US 2014/0152106 A1 · Current generation circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152106 A1 - Document ID: US20140152106A1 - Status: Published application - Kind: A1 - Application number: 14/044,144 - Filed: 2013-10-02 - Published: 2014-06-05 - Earliest claimed: 2012-12-03 - Assignees: Hyundai Motor Company - Applicants: Hyundai Motor Company - Inventors: Soon-Myung Kwon; Sang Gyu Park - Web page: https://patentgrep.com/patent/US20140152106A1 ## CPC - H02J 4/00: Circuit arrangements for mains or distribution networks not specified as AC or DC; Circuit arrangements for mains or distribution networks combining AC and DC sections or sub-networks (arrangements using intermediate DC-AC-DC conversion H02J1/002; arrangements using high-voltage DC [HVDC] links H02J3/36) - G05F 3/242: {with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES ## Abstract A current generating circuit that includes a first current source that generates a first current having a negative temperature coefficient a second current source that generates a second current having a positive temperature coefficient. A compensation circuit generates a common current using a first transistor that receives the first current and a second transistor formed in a mirroring structure, a third transistor that receives the second current, and a fourth transistor formed in a mirroring structure. In addition, the compensation circuit provides the common current as an output current using a transistor that is formed in at least a pair of mirroring structures. ## Claims ### Claim 1 A constant current generating circuit, comprising: a first current source that generates a first current that has a negative temperature coefficient; a second current source that generates a second current that has a positive temperature coefficient; and a compensation circuit that generates a common current using a first transistor that receives the first current and a second transistor formed in a mirroring structure, a third transistor that receives the second current, and a fourth transistor formed in a mirroring structure, wherein the compensation circuit provides the common current as an output current using a transistor formed in at least a pair of mirroring structures. ### Claim 2 (depends on 1) The current generating circuit of claim 1, wherein a current amount of the first current and a current amount of the second current are adjusted between the first transistor and the second transistor and between the third transistor and the fourth transistor, respectively using a width/length (W/L) ratio of the transistor. ### Claim 3 (depends on 1) The current generating circuit of claim 1, wherein the common current has a corresponding temperature coefficient within a predetermined error range in an intermediate value of the negative temperature coefficient and the positive temperature coefficient. ### Claim 4 (depends on 1) The current generating circuit of claim 1, wherein the first transistor, the second transistor, the third transistor, and the fourth transistor are metal-oxide-semiconductor field-effect transistors (MOSFET) of an N-type channel. ### Claim 5 (depends on 1) The current generating circuit of claim 1, wherein the common current is transferred to a transistor formed in a pair of mirroring structures to adjust a current amount thereof, wherein the output current is a source current. ### Claim 6 (depends on 5) The current generating circuit of claim 5, wherein the transistor that is formed in the pair of mirroring structures controls a current amount of a common current provided to the output current by adjusting a width/length (W/L) ratio of a transistor that has a gate connected to a gate of a transistor in which the common current is transferred based on a W/L ratio of a transistor. ### Claim 7 (depends on 5) The current generating circuit of claim 5, wherein the transistor that is formed in the pair of mirroring structures is a metal-oxide-semiconductor field-effect transistor (MOSFET) of a P-type channel. ### Claim 8 (depends on 1) The current generating circuit of claim 1, wherein the common current is transferred to a transistor formed in two pairs of mirroring structures to adjust a current amount thereof, wherein the output current is a sink current. ### Claim 9 (depends on 8) The current generating circuit of claim 8, wherein the transistor that is formed in the two pairs of mirroring structures includes: a first pair of transistors to which the common current is transferred; and a second pair of transistors that output the output current, wherein the first pair of transistors are metal-oxide-semiconductor field-effect transistors (MOSFET) of a P-type channel, and the second pair of transistors are MOSFET transistors of an N-type channel. ### Claim 10 (depends on 9) The current generating circuit of claim 9, wherein two transistors of a mirroring structure of the first pair of transistors and the second pair of transistors, respectively control a current amount that flows to the transistor by adjusting a width/length (W/L) ratio between two transistors of the mirroring structure. ### Claim 11 (depends on 9) The current generating circuit of claim 9, wherein each of sources of the first pair of transistors are connected to a first power source that applies a predetermined level constant voltage, and each of sources of the second pair of transistors apply a constant voltage of a level lower than the level constant voltage or is connected to a second power source that has a ground potential. ### Claim 12 A constant current generating circuit, comprising: a first current source that generates a first current having a negative temperature coefficient; a second current source that generates a second current having a positive temperature coefficient; and a compensation circuit connected to the first current source and the second current source to receive the first current and the second current and is configured to generate a predetermined constant third current that has a substantially small temperature coefficient insensitive to a temperature change. ### Claim 13 (depends on 12) The constant current generating circuit of claim 12, wherein the constant current has a reduced temperature coefficient when a temperature coefficient of each current transferred from the first current second and the second current source is supplemented.