公开(公告)号：US10541702B1

公开(公告)日：2020-01-21

申请号：US16142964

申请日：2018-09-26

Applicant: Analog Devices Global Unlimited Company

Inventor： Rares Andrei Bodnar ,  Christopher Peter Hurrell

IPC: H03M1/06 ,  H03M1/08 ,  H03H7/06

Abstract: Input stages for an analog to digital converter wherein charge for charging parasitic capacitances in the input stage, and particularly in the input switch is sourced from a node which means that it does not have to pass through the input RC filter. This has the effect that the input RC filter can be of lower bandwidth, and/or have a larger resistor value, with the consequent result that there is lower power dissipation in the ADC drive circuitry. In one example this effect is realized by providing a separate input into which charge to charge the parasitic capacitances can be fed from external circuitry. In another example an operational amplifier having high (ideally infinite) input impedance can be used to feed charge to the input switch from the input to the RC filter, or from the node between the resistor and capacitor of the filter, again without unsettling the filter.

公开(公告)号：US10020068B2

公开(公告)日：2018-07-10

申请号：US15266741

申请日：2016-09-15

Applicant: Analog Devices Global

Inventor： Christopher Peter Hurrell ,  Rares Andrei Bodnar ,  Pasquale Delizia

IPC: G11C27/02 ,  H03K17/693

CPC classification number: G11C27/02 ,  G11C7/02 ,  G11C27/024 ,  H03K17/693

Abstract: Distortion in a combined sample and hold circuit and multiplexer can be reduced by dividing the sample and hold circuit and the multiplexer up into main and compensation signal channels, and considering the total error signal that arises during an acquire phase across both the switches of the multiplexer and the input switches of the sample and hold stage as a single error signal that has to be compensated. This compensation is then achieved by causing the same error voltages to be induced in both the main and compensation channels of the whole MUX and sample and hold circuit, such that errors can be made to cancel, thus improving the performance of the stage.

公开(公告)号：US09705465B2

公开(公告)日：2017-07-11

申请号：US14464611

申请日：2014-08-20

Applicant: ANALOG DEVICES GLOBAL

Inventor： Rares Andrei Bodnar ,  Patrick Joseph Pratt ,  Donal Bourke ,  Peter James Tonge

IPC: H03G3/30 ,  H03F3/21 ,  H03G3/00 ,  H03F3/193 ,  H03F1/30 ,  H03F1/32

CPC classification number: H03G3/3042 ,  H03F1/301 ,  H03F1/3205 ,  H03F3/193 ,  H03F3/21 ,  H03F2200/129 ,  H03F2200/144 ,  H03F2200/18 ,  H03F2200/451 ,  H03F2200/462 ,  H03F2200/481 ,  H03G3/001 ,  H03G3/3089

Abstract: A control apparatus is provided that can provide high dynamic resolution and is suitable for inclusion within an integrated circuit. The control apparatus receives a demand signal representing a desired value of a measurand, and a feedback signal representing a present value or a recently acquired value of the measurand. The processing circuit forms a further signal a further signal which is a function of the demand and feedback signals. The further signal is then subjected to at least an integrating function. The demand signal, feedback signal or the further signal is processed or acquired in a sampled manner. The use of such sampled, i.e. discontinuous, processing allows integration time constants to be synthesized which would otherwise require the use of unfeasibly large components within an integrated circuit, or the use of off-chop components. Both of these other options are expensive.