Abstract: A device for detecting spatial variation in the intensity of electromagnetic radiation in a given spectral region comprises a body of semiconductor material that responds to electromagnetic radiation in the given spectral region by generating charge carriers. The body of semiconductor material has first and second charge collection regions separated by a barrier region that forms a potential barrier to the charge carriers in the charge collection regions. The device also comprises an electrode structure for establishing a predetermined potential in the charge collection regions, whereby charge carriers can be accumulated in the charge collection regions, and first and second output devices connected to the first and second charge collection regions respectively for extracting charge therefrom.

Abstract: A time stamp circuit comprises a plurality of counter programmable logic arrays for providing a Gray code count. Each count provided by the counters is associated as a time value with a specified event to be stored in memory. The count is generated automatically over a range of progressively slower frequencies provided by frequency dividing circuitry connected to an oscillator. The circuit has two modes of operation, a cumulative mode and a delta mode. In the cumulative mode, the count begins with the first occurrence of a specified event and ends when acquisition is halted. In the delta mode, a control programmable logic array automatically resets the Gray code count and thereby the clock frequency to its highest frequency each time a specified event is stored. The resolution, or time between counts, therefore is the same to begin between each pair of events.

Abstract: A termination for high impedance attenuator to be connected to the input of such high impedance attenuator. The termination circuit includes a series combination of a termination resistor, a delay line and an inductor, thereby cancelling the negative reflection due to the capacitive element at the output of the attenuator while maintaining the overall input impedance constant over a wide frequency range.

Abstract: A method and apparatus for establishing the correct order of probe channels in a logic analyzer is disclosed. Logic analyzers have probe PODS connected thereto, the PODS having a plurality of probe tips connected thereto for further connection to the terminals of a product under test. With this invention, the order of connection of the tips to the terminals can be ignored because the correct order is established via the logic analyzer (LA) itself. A ROM has firmware stored therein for enabling the logic analyzer to establish the correct order of connection. The binary data from each POD is stored in memory. The binary data in memory may be converted to hexadecimal form and stored in the display controller. By using a keyboard, the operator displays, on the LA display, a menu-mode display, which includes a display of the probe channel identifiers for each POD, the identifiers reflecting the actual order of connection of the probe tips to the terminals of the product under test.