摘要:
A photodetector circuit incorporates an APD detector structure (10) comprising a p− silicon handle wafer (12) on which a SiO2 insulation layer (14) is deposited in known manner. During manufacture a circular opening (16) is formed through the insulation layer (14) by conventional photolithography and etching, and an annular p+ substrate contact ring (18) is implanted in the handle wafer (12) after opening of the window (16). The APD itself is formed by implantation of a p region (20) and an n+ region (22). After the various implantation steps a metallisation layer is applied, and annular metal contacts are formed by the application of suitable photolithography and etching steps, these contacts comprising an annular contact (26) constituting the negative terminal and connected to the p+ substrate contact ring (18), an annular metal contact (28) constituting the positive terminal and connected to the n+ region (22) of the APD, and source and drain contacts (30) and (32) (not shown in FIG. 1) connected to the source and drain of one or more CMOS MOSFET devices of the associated CMOS readout circuitry fabricated within a Si layer (34) formed on top of the insulation layer (14). Such an arrangement overcomes the problem of combining APDs with CMOS circuits in that APDs operate at relatively high reverse bias (15-30V) and CMOS circuits operate at low voltage (SV), and the arrangement must be such as to prevent the high bias voltage from affecting the operation of adjacent CMOS transistors.
摘要:
A photodetector circuit incorporates an avalanche photodiode structure having a contact layer (14) forming an ohmic contact over an annular region (18) with the annular guard ring (8). In the fabrication process, the starting substrate can either be the handle wafer of a p− silicon-on-insulator wafer, or a p-Si substrate with an insulating SiO2 layer (4). A window (6) is produced in the insulating layer (4) by conventional photolithographic and etching. A n+ guard ring (8) is created by diffusing donor impurities into the substrate, and a thinner insulating SiO2 layer (22) is thermally grown so as to cover the exposed surface of the substrate within the window (6). P-type dopant is then implanted through the thin oxide layer to increase the doping level near the surface of the substrate. Subsequently a second window (24) is made in the insulating layer (22), and the layer (12) is then epitaxially grown selectively on the area of the substrate exposed by the window (24) in the insulating layer (22). The use of the thin oxide layer (22) reduces the area of the interface between the silicon of the layer (12) and the SiO2 of the layer (22) during the selective epitaxial deposition, thus leading to a reduction in the detrimental effect of the thermal expansion coefficient mismatch and producing less epitaxial defects at the window edge. After the epitaxial layer (12) has been grown the remaining part of the insulating layer (22) is removed by wet oxide etch which exposes an annular portion (26) of the underlying guard ring (8). Subsequently a n+ silicon epi-poly layer (14) is deposited on the surface of the device, and forms an ohmic contact with the guard ring (8), and simultaneously forms the top contact of the photodiode. Such a fabrication process does not significantly increase the fabrication complexity. Although an additional mask is required as compared with the conventional fabrication process, the fact that the layer (14) is in ohmic contact with the guard ring (8) means that it is no longer necessary to provide a separate contact to the guard ring, and as a result the overall number of masks or process steps used may be similar in both processes.
摘要:
A personal messaging agent (220) performs enhanced messaging services. The personal messaging agent (220) includes a user profile (310), a message filter (320), and at least one external helper (330). The user profile (310) stores user preferences for processing messages. The message filter (320) receives messages, performs in-band processing on the messages based on the user preferences, and generates at least one event for triggering out-of-band processing of the messages. The external helpers (330) perform the out-of-band processing of the messages in response to the event(s).
摘要:
The present invention relates to a removable modular heel assembly that is attached to a high heel shoe, which shoe may be adapted to accept the assembly, and which assembly is designed to increase the surface area of the heel or shoe to enhance stability, comfort, and/or balance for the wearer.
摘要:
A disposable sink strainer comprising a cylindrical portion having a plurality of openings therein and a bottom portion substantially constituting a disc and integrally connected to and depending from a lowermost portion of the cylindrical portion, the bottom portion being formed with a plurality of holes therein. The cylindrical walls are adapted to fit complementarily in a conventional sink strainer, and have a rim extending horizontally and radially outwardly and integrally therefrom at an uppermost portion thereof.
摘要:
Systems and methods are provided that enable multimodal communication command and control of various systems, such as the Internet, cable or satellite television, and other systems, with utilization of a device configured to accept user command and control inputs and an interface to the system or systems being controlled.
摘要:
The present invention relates to the use of sonic hedgehog antagonists in the prevention and treatment of cancer and other hyperproliferative diseases or disorders. Methods for identifying such antagonists are also provided.
摘要:
Methods and devices for measuring analyte concentration in a nonblood body fluid sample enable rapid-results, low-cost diagnosis of various medical conditions in an outpatient setting. In one embodiment, measured patient sodium concentration is used by the patient or the patient's healthcare provider to guide medical decision-making. In another embodiment, measured patient sodium concentration is processed to mechanically adjust the concentration of sodium in an aqueous solution to be delivered to the patient for oral administration. In yet another embodiment, a closed loop system measures saliva sodium concentration and uses any of a number of different types of feedback control systems to monitor and control the fluid and/or electrolyte state of the patient.
摘要:
A device is provided including a processor and a display configured to list more than one presence enabled contact. A user agent is configured to indicate an availability status of the device to a presence server. The user agent is at least partially executed by the processor. Moreover, at least one input is configured to enable a device user to request a communications session with at least one of the plurality of presence enabled contacts. The request is initiated by the user agent when the requested presence enabled contact is available.
摘要:
Variant human MLH1 and MSH2 genes are provided. Methods of using these variant genes to diagnose hereditary non-polyposis colorectal cancer (HNPCC) and/or determine a patient's susceptibility to developing HNPCC are also provided. Methods and compositions for identifying new variant MLH1 of MSH2 genes are also provided. In addition, experimental models for hereditary non-polyposis colorectal cancer comprising these variant genes are provided.