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公开(公告)号：US10727794B2
公开(公告)日：2020-07-28
申请号：US16188686
申请日：2018-11-13
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , James Nolan
Abstract: An apparatus includes an amplifier, an input port, a first modulator circuit connected to the input port, and a correction circuit. The correction circuit is configured to determine a common mode voltage of the input port and receive a first clock signal. The correction circuit is further configured to manipulate, based at least in part upon the common mode voltage of the input port, the first clock signal to generate a second clock signal. The second clock signal is produced for the first modulator circuit. The correction circuit is further configured to determine whether the second clock signal is out of phase with a third clock signal, and, based upon a determination that the second clock signal is out of phase with the third clock signal, reset the second clock signal.
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公开(公告)号：US10454438B2
公开(公告)日：2019-10-22
申请号：US15901623
申请日：2018-02-21
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a chopping modulator circuit that continuously swaps tail current sources between the transconductors. This tail current swapping reduces the contribution to the CFIA's gain error caused by random mismatch between the tail currents of the input and feedback transconductors. The modulator circuit operates on a clock cycle to periodically swap the tail current sources. As a result, even if the tail currents are mismatched, on average the tail currents (transconductor gains) will approximately equal out, and the contribution of the tail current difference to the gain error is canceled out.
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公开(公告)号：US20180323748A1
公开(公告)日：2018-11-08
申请号：US15887199
申请日：2018-02-02
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
CPC classification number: H03F1/12 , H03F1/342 , H03F3/45179 , H03F3/45183 , H03F3/45672 , H03F2200/258 , H03F2200/261 , H03F2203/45048 , H03F2203/45138 , H03F2203/45341 , H03F2203/45342 , H03F2203/45466 , H03F2203/45494 , H03F2203/45504 , H03F2203/45511 , H03F2203/45521 , H03G1/0023 , H03G1/0029 , H03G1/0088
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.
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Patent Agency Ranking
公开(公告)号：US10439559B2
公开(公告)日：2019-10-08
申请号：US16371255
申请日：2019-04-01
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.
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公开(公告)号：US20190149108A1
公开(公告)日：2019-05-16
申请号：US16188686
申请日：2018-11-13
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , James Nolan
Abstract: An apparatus includes an amplifier, an input port, a first modulator circuit connected to the input port, and a correction circuit. The correction circuit is configured to determine a common mode voltage of the input port and receive a first clock signal. The correction circuit is further configured to manipulate, based at least in part upon the common mode voltage of the input port, the first clock signal to generate a second clock signal. The second clock signal is produced for the first modulator circuit. The correction circuit is further configured to determine whether the second clock signal is out of phase with a third clock signal, and, based upon a determination that the second clock signal is out of phase with the third clock signal, reset the second clock signal.
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公开(公告)号：US20190229683A1
公开(公告)日：2019-07-25
申请号：US16371255
申请日：2019-04-01
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
CPC classification number: H03F1/12 , H03F1/342 , H03F3/45179 , H03F3/45183 , H03F3/45672 , H03F2200/258 , H03F2200/261 , H03F2203/45048 , H03F2203/45138 , H03F2203/45341 , H03F2203/45342 , H03F2203/45466 , H03F2203/45494 , H03F2203/45504 , H03F2203/45511 , H03F2203/45521 , H03G1/0023 , H03G1/0029 , H03G1/0088
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.
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公开(公告)号：US10250198B2
公开(公告)日：2019-04-02
申请号：US15887199
申请日：2018-02-02
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.
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公开(公告)号：US20180323762A1
公开(公告)日：2018-11-08
申请号：US15901623
申请日：2018-02-21
Applicant: Microchip Technology Incorporated
Inventor： Serban Motoroiu , Jim Nolan
CPC classification number: H03G3/30 , H03F1/26 , H03F3/45179 , H03F3/45183 , H03F3/45659 , H03F2200/129 , H03F2200/261 , H03F2203/45048 , H03F2203/45392 , H03F2203/45466 , H03F2203/45468 , H03F2203/45504 , H03F2203/45511 , H03F2203/45521 , H03F2203/45528 , H03F2203/45534 , H03G1/0023 , H03G1/0029
Abstract: A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a chopping modulator circuit that continuously swaps tail current sources between the transconductors. This tail current swapping reduces the contribution to the CFIA's gain error caused by random mismatch between the tail currents of the input and feedback transconductors. The modulator circuit operates on a clock cycle to periodically swap the tail current sources. As a result, even if the tail currents are mismatched, on average the tail currents (transconductor gains) will approximately equal out, and the contribution of the tail current difference to the gain error is canceled out.
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