1
Frithjof von Sichart, Jorg Eberspacher: Method for transmitting data in a telecommunications exchange. Siemens Aktiengesellschaft, Jeffrey P Morris, April 28, 1987: US04661952 (26 worldwide citation)

A method of transmitting data in a telecommunications exchange via a ring line system which allows information items to be transmitted in periodically recurring pulse frames. The pulse frames are split into at least two sub-frames, where in the first sub-frame the information is transmitted in a con ...


2
Frithjof von Sichart: Complementary metal-oxide-semiconductor input circuit. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, July 21, 1987: US04682047 (13 worldwide citation)

A pull-up or pull-down resistor is connected between the CMOS circuit input and an operating potential source for defining the input potential of the unconnected circuit input and is formed by a MOS transistor circuit which is controlled from the circuit input and which is conductive between the thr ...


3
Klaus Wintzer, Josef Zemanek, Frithjof von Sichart: Circuit arrangement for the synchronization of a digital subscriber station by a digital exchange in a PCM telecommunication network. Siemens Aktiengesellshaft, Spellman Joel & Pelton, July 20, 1982: US04340962 (8 worldwide citation)

Circuit arrangement for synchronizing a subordinate system, in particular a digital subscriber station, by a superordinate system, in particular a digital exchange, in a PCM time-multiplex telecommunication network. The circuit arrangement operates to evaluate only those synchronization bit combinat ...


4
Robert Lechner, Frithjof von Sichart, Peter Picard: Method for eliminating the zero point error in an iterative analog-digital converter. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, August 28, 1984: US04468651 (7 worldwide citation)

A zero equalization capacitor is connected to a first input of the comparator K, and at the beginning of the equalization phase, a voltage value of zero is placed at both comparator inputs, and a feedback network RN is connected between the comparator output and the capacitor, whereby the capacitor ...


5
Reiner Binz, Eberhard Knorpp, Frithjof von Sichart: Time division multiplex switching network unit. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, June 19, 1984: US04455648 (7 worldwide citation)

In switching network units which operate employing an information memory featuring cyclic input and random reading, the number of connections is particularly limited by the fact that during random reading it is not possible to exceed a specific speed. They are normally designed in such a manner that ...


6
Frithjof von Sichart: Circuit arrangement for converting digital signals in particular PCM signals, into corresponding analog signals with a R-2R chain network. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, November 15, 1983: US04415883 (7 worldwide citation)

Digital signals, in particular PCM signals, each comprising a number of bits, are converted into analog signals with a R-2R chain network which has series resistors each having a resistance value R and shunt resistors having a resistance value 2R, by feeding a constant current into a connection poin ...


7
Frithjof von Sichart, Wolf Springstubbe: Digital-to-analog converter. Siemens Aktiengesellschaft, Spellman Joel & Pelton, June 22, 1982: US04336527 (3 worldwide citation)

An R-2R-ladder network has n chained ladder cells, each controlled by an associated one of n control circuits wherein n corresponds to the number of digits of a digital signal to be converted. Each cell is composed of a series transistor inserted between two neighboring nodes of the ladder network a ...


8
Reiner Binz, Eberhard Knorpp, Frithjof von Sichart: Time division multiplex switching network unit. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, November 13, 1984: US04482995 (3 worldwide citation)

In a time-division multiplex switching network unit for time-space switching which operates employing an information memory which has information input thereto in a cyclic manner and read therefrom in a random fashion, the number of terminals is limited, in particular, by the fact that during random ...


9
Frithjof Von Sichart, Klaus Wiedeburg: Method and circuit arrangement for transliteration of code words. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, October 15, 1985: US04547765 (1 worldwide citation)

For transliterating code words of a code having m-place code words into the corresponding code words of a different code likewise having m-place code words, individual bits of the code word to be translitereated are forwarded during serial input into a m-place shift register or during the serial out ...