Daniel T Smythe

US Patent:

42913900, Sep 22, 1981

Filed:

Sep 28, 1979

Appl. No.:

6/080098

Inventors:

Ernest R. Stern - Concord MA
Richard W. Ralston - Bedford MA
Daniel L. Smythe - Carlisle MA
Barry E. Burke - Lexington MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G11C 1140

US Classification:

365183

Abstract:

A solid state device capable of providing long-term storage of analog signals which in a particular embodiment utilizes a plurality of MNOS storage elements. An input analog signal is applied to a plurality of temporary storage means each associated with an MNOS storage element for temporarily storing a charge proportional to the amplitude of the portion of the input analog signal applied thereto. Storage control means are used to transfer the temporarily stored charges to the long-term MNOS storage elements so that controlled amounts of carrier charges are stored in the nitride layers thereof, such controlled amounts being substantially linearly proportional to the temporarily stored charges associated therewith. In a particular embodiment the input analog signal may be supplied via a surface acoustic wave (SAW) device and coupled to the MNOS device directly or it may be coupled to a charge-coupled device (CCD) and thence coupled to the MNOS device.

US Patent:

51948370, Mar 16, 1993

Filed:

Nov 20, 1991

Appl. No.:

7/795301

Inventors:

Daniel L. Smythe - Carlisle MA
Jonathan B. Green - Belmont MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H03H 1500

US Classification:

333166

Abstract:

A tapped delay line uses a varistor network for tap weighting. The varistors may be used in a resistive summing network or as amplifier gain control elements. In addition, the varistors can be programmed by a voltage programming circuit comprising a switch array, an input voltage programming bus, and sets of master and slave digital programming signals.

US Patent:

42901189, Sep 15, 1981

Filed:

Sep 28, 1979

Appl. No.:

6/080100

Inventors:

Ernest R. Stern - Concord MA
Richard W. Ralston - Bedford MA
Daniel L. Smythe - Carlisle MA
Barry E. Burke - Lexington MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G11C 1140

US Classification:

365183

Abstract:

A solid state device combining the use of a surface-acoustic-wave (SAW) device and a charge-coupled device (CCD) which utilizes an interface means therebetween comprising a plurality of conductive fingers responsive to an acoustic wave on the SAW device. The conductive fingers are electrically connected at at least one end to the CCD substrate and a plurality of temporary storage means are used for temporarily storing a charge proportional to the voltage potential on the associated conductive finger. The temporary stored charges can be transferred to the storage wells of the CCD for storing a replica of the acoustic wave. The SAW-CCD combination is adapted for use as a buffer memory, an accumulating correlator, or as a matched filter device.

US Patent:

53509447, Sep 27, 1994

Filed:

Feb 20, 1992

Appl. No.:

7/839487

Inventors:

Michael W. Geis - Acton MA
Daniel L. Smythe - Swampscott MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H01L 2701
H01L 2900
H01L 2978

US Classification:

257 77

Abstract:

Electrical quality insulating films on n-type and p-type diamond substrates are provided in which an insulating film such as a silicon dioxide film is deposited onto the exposed face of a diamond substrate, such as by chemical vapor deposition. Forming a conducting layer atop the silicon dioxide allows the creation of a metal-oxide-silicon device with which semiconductor carriers can be controlled through the application of a bias voltage to the conductor surface.