公开(公告)号：CA1099409A

公开(公告)日：1981-04-14

申请号：CA293097

申请日：1977-12-14

Applicant: IBM

Inventor： HELLER LAWRENCE G ,  TERMAN LEWIS M ,  YEE YEN S

IPC: G01R19/10 ,  G01R29/24 ,  G11C27/04 ,  H01L21/339 ,  H01L29/762 ,  H01L29/768 ,  H03M1/00 ,  G11C11/08

Abstract: CHARGE TRANSFER DEVICE DIFFERENCING CIRCUIT A circuit is disclosed for obtaining an output signal proportional to the difference between two charge packet quantities nondestructively. The preferred embodiment includes a substrate with a potential well disposed under a floating gate electrode having charge transfer means for entering and removing charge from the potential well. A first quantity of charge Qa which is stored in the potential well is transferred out of the well at time t1 with a resulting proportional increase in the floating gate voltage which results from capacitor coupling from the charge to the floating gate. At a subsequent time t2 a second charge quantity Qb is transferred into the potential well and causes a proportional decrease in the floating gate voltage. The net change .DELTA.V in the floating gate voltage that results is proportional to the difference between the two charge quantities Q ant Qb.

公开(公告)号：FR2343369A1

公开(公告)日：1977-09-30

申请号：FR7702067

申请日：1977-01-18

Applicant: IBM

Inventor： HELLER LAWRENCE G ,  TERMAN LEWIS M

IPC: H03M1/44 ,  H01L29/768 ,  H01L29/78 ,  H03M1/00 ,  H03K13/02

Abstract: Analog-to-digital (A/D) and digital-to-analog (D/A) converter circuits are provided using charge redistribution. The analog-to-digital converter circuit also employs successive approximation binary search techniques wherein the number of search voltages generated is a minimum. The analog-to-digital circuit includes a digital-to-analog converter circuit, a comparator circuit and a logic control means. The digital-to-analog circuit, under control of the logic means, accepts a reference voltage input and produces a sequence of search voltages which are compared with an unknown analog input voltage at the comparator. The resultant outputs from the comparator are applied to the control logic to determine the search voltage sequence. The digital-to-analog converter for the aforesaid circuit is provided in one embodiment employing charge-coupled-device technology. A substrate and two storage electrodes are combined to produce two potential storage wells and a transfer electrode is provided to move charge carriers between the storage wells. A reference charge packet QR is stored and divided by charge redistribution between the two potential wells to produce a sequence of charge packets of value QR/2, QR/4, QR/8, QR/16 etc. which can be selectively combined to produce analog output of a D/A converter. In the A/D converter the same sequence of charge packets is used to generate the equivalent of a binary search sequence QR/2, QR/2+/-QR/4, QR/2+/-QR/4+/-QR/8 etc. In another embodiment a bucket brigade device is provided to accomplish the same result. Because of the technique of charge redistribution wherein precise amounts of charge can be shifted in either direction between storage means, the total number of search value steps is a minimum.

公开(公告)号：CA901655A

公开(公告)日：1972-05-30

申请号：CA901655D

Applicant: IBM

Inventor： SPAMPINATO DOMINIC P ,  TERMAN LEWIS M