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Patent Agency Ranking
公开(公告)号：US3714599A
公开(公告)日：1973-01-30
申请号：US3714599D
申请日：1971-03-24
Applicant: MOTOROLA INC
Inventor： CECIL J
Abstract: An improved and simplified termination circuit for the ladder portion of a digital to analog converter. the termination circuit includes an amplifier having unity current factor, known ladder termination voltage, and a very low impedance looking from the ladder into the amplifier.
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公开(公告)号：US3777251A
公开(公告)日：1973-12-04
申请号：US3777251D
申请日：1972-10-03
Applicant: MOTOROLA INC
CPC classification number: G05F3/227
Abstract: Circuitry for providing a constant current to a load includes a source of current and a regulating circuit interposed between the current source and the load. The regulating circuit includes a current shunting transistor coupled to the output of the current source and a feedback transistor also coupled to the output of the current source and to the base of the current shunting transistor. A diode connected between the current shunting transistor and the current source is chosen to have a dynamic admittance substantially equal to the transconductance of the current shunting transistor to provide the latter with unity voltage gain. A variation in current output of the source is accommodated by the current shunting transistor so that a substantially constant voltage at the output thereof is maintained. An output circuit including a transistor, coupled to the output of the current shunting transistor and to the load, and controlled by the output voltage, provides a substantially constant current to the load despite current variations from the current source.
Abstract translation: 向负载提供恒定电流的电路包括插入电流源和负载之间的电流源和调节电路。 调节电路包括耦合到电流源的输出的电流分流晶体管和还耦合到电流源的输出和电流分流晶体管的基极的反馈晶体管。 连接在电流分流晶体管和电流源之间的二极管被选择为具有基本上等于电流分流晶体管的跨导的动态导纳，以向后者提供单位电压增益。 源极的电流输出的变化由电流分流晶体管容纳，使得在其输出处保持基本上恒定的电压。 包括晶体管的输出电路，其耦合到电流分流晶体管的输出和负载，并且由输出电压控制，尽管来自电流源的电流变化，但是向负载提供基本上恒定的电流。
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3.发明授权
公开(公告)号：US3717777A
公开(公告)日：1973-02-20
申请号：US3717777D
申请日：1971-03-24
Applicant: MOTOROLA INC
Inventor： CECIL J
Abstract: This disclosure relates to a digital to analog converter including a simplified reference current source whose current output may be determined by a reference resistor and a positive or negative reference voltage source.
Abstract translation: 本公开涉及一种数模转换器，其包括简化的参考电流源，其电流输出可由参考电阻和正或负参考电压源确定。
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公开(公告)号：US3815123A
公开(公告)日：1974-06-04
申请号：US25213372
申请日：1972-05-10
Applicant: MOTOROLA INC
Abstract: An improved termination circuit for the ladder portion of a digital to analog converter. The termination circuit includes an amplifier having unity current and voltage amplification factors and a very low impedance looking from the ladder into the amplifier.
Abstract translation: 一种用于数模转换器的梯形部分的改进的终端电路。 终端电路包括具有单位电流和电压放大系数的放大器以及从梯形图看到放大器的非常低的阻抗。
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公开(公告)号：US3731181A
公开(公告)日：1973-05-01
申请号：US3731181D
申请日：1972-04-12
Applicant: MOTOROLA INC
Abstract: A digital to analog converter is supplied with operating current from a reference current source including an operational amplifier, across the input terminals of which are connected a reference voltage and a reference resistor in series. The output of the operational amplifier is fed back to the input by a reference transistor coupled between one of the input terminals and a source of potential. The current flowing through the reference transistor is established by the reference voltage and the reference resistor. The base of the reference transistor is coupled in common with the base of another transistor matched to it, so that the collector of such other transistor supplies the operating current to the digital to analog converter circuit.
Abstract translation: 数模转换器由来自包括运算放大器在内的参考电流源的工作电流供给，其输入端连接参考电压和参考电阻串联。 运算放大器的输出由连接在一个输入端子和电位之间的参考晶体管反馈到输入端。 流过参考晶体管的电流由参考电压和参考电阻建立。 参考晶体管的基极与与其匹配的另一个晶体管的基极共同耦合，使得这种其它晶体管的集电极将工作电流提供给数模转换器电路。
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