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    • 2. 发明授权
    • Sample-and-hold device
    • 样品保持装置
    • US5081372A
    • 1992-01-14
    • US528658
    • 1990-05-24
    • Marcellinus J. M. Pelgrom
    • Marcellinus J. M. Pelgrom
    • G11C27/02
    • G11C27/026
    • A sample-and-hold device provided with a series arrangement of a first and a second integrating circuit, each including an input, an output and a control signal input. The output of the first integrating circuit is coupled to the input of the second integrating circuit. A control unit supplies a first and a second control signal to the control signal inputs of the first and the second integrating circuit, respectively. The output of the second integrating circuit is fed back to the input of the first integrating circuit. The first integrating circuit is controlled by the first control signal in a manner such that in the first integrating circuit an integration step is performed upon the difference between the input voltage on the input of the first integrating circuit and the output voltage fed back from the output of the second integrating circuit. The second integrating circuit is controlled by the second control signal in a manner such that upon completion of the integration step in the first integrating circuit, an integration step is performed upon the output signal of the first integrating circuit.This arrangement provides comparatively small signal variations at the inputs of the amplifier stages in the integrating circuits and thus reduces signal distortion.
    • 6. 发明授权
    • Plural stage switched capacitor integrating digital-to-analog converter
    • 集成数模转换器的多级开关电容器
    • US4872011A
    • 1989-10-03
    • US178051
    • 1988-04-05
    • Marcellinus J. M. PelgromAdrianus C. J. Duinmaijer
    • Marcellinus J. M. PelgromAdrianus C. J. Duinmaijer
    • H03M1/66H03M1/00
    • H03M1/0697H03M1/0607H03M1/682H03M1/806
    • A digital-to-analog converter for converting a digital signal having a word length n into an analog signal. The converter includes at least two switched capacitor integrators (1, 2) arranged in series and a control unit (18) for applying control signals to the integrators which perform an integration step under the influence of the control signal. Each integrator is provided with a capacitor network (11, 12) having at least two capacitors (27.1, 27.2, . . . ; 28.1, 28.2, . . . ) coupled between the input (13; 4) of the integrator and the inverting input (-) of an associated amplifier stage (5; 6). A capacitor (9; 10) is coupled between the inverting input (-) and the output (7; 8) of this amplifier stage. The control unit is adapted to apply, in this order, a first control signal to the first integrator (1), a second control signal to the second integrator (2), a third control signal to the first integrator and a fourth control signal to the second integrator. The first integrator couples a total capacitance of M1.Cref1 and M3.Cref1 during a given time interval to the inverting input of the amplifier stage (5) under the influence of the first and the third control signal, respectively. The second integrator (2) couples a total capacitance of M2.Cref2 and M4.Cref2 during a given time interval to the inverting output of the amplifier stage (6) under the influence of the second and the fourth control signal, respectively. For converting an arbitrary n-bit digital signal, M2+M4 is equal to a constant (k) which is preferably equal to 2.sup.p in which p.ltoreq.n an offset voltage which is independent of the value of the digital signal to be converted is produced at the output (8) of the converter.