Siemens Aktiengesellschaft

Hermann Betzl

Roland Schreiber

Ernst Hebenstreit

Josef A Nossek

Wilhelm Volejnik

Friedrich L Kuenemund

Johann Magerl

A combiner circuit employs the maximum power method, in which the phase of one of the signals is varied such that the power of the aggregate signal (main and diversity) is varied such that the power of the aggregate subsequently formed is optimally high. In order to improve this combining method that becomes less and less efficient with increasing bandwidth and number of steps of signals, particularly given selective fading, it is provided that the combiner circuit contains a control circuit for the combination phase, the control circuit being composed of a maximum power control circuit and of two preceding, supplementary circuits for varying the amplitudes of the main and diversity signals. The amplitude variation of the main and diversity channel spectrum occurs in such a fashion that the signal spectra are split in the appertaining branches of the two supplementary circuits by respective identical bandpass filters for the lower spectrum half and the upper spectrum half, the powers of the sub-bands are measured at the outputs of the bandpass filters and both sub-bands are set to approximately identical values.

Combiner circuit in space-diversity reception

The invention relates to an electrical filter circuit operated with a definite sampling and clock frequency f.sub.T, such filter being made up of CTD elements, and having at least one bipolar or quadripolar resonator in the form of a self-contained conductor loop (for example, C.sub.1, C.sub.2) with unidirectional transmission behavior. Differences in the transfer capacitances of such circuits are reduced, as far as possible, in order to thereby simplify integrated manufacture as far as possible, by positioning the frequency band to be filtered out at a frequency position which lies above half the clock frequency (f.sub.T /2), or in the range from f.sub.T /2 through 3f.sub.T /2.

Electrical filter circuit operated with a definite sampling and clock

A filter circuit utilizing charge transfer delay lines having individual CTD elements utilizing four-terminal resonators each of which is designated as a self-contained closed looped circuit and which determine the frequency dependent transmission characteristics of the filter circuit and wherein successive four-terminal resonators are interconnected by way of a coupling circuit. The invention utilizes the coupling circuit mounted between adjacent four-terminal resonators which are constructed simply as possible and utilizing integrated circuit techniques. Amplifiers are connected in parallel with the input and/or the output of the individual four-terminal resonators and the signal flow direction of the amplifiers corresponds to that of parallel connected CTD lines and the series lines of the coupling circuit and the amplifiers have unidirectional transmission characteristics and an inverting amplifier is contained in at least one of the series lines.

Electrical filter circuit utilizing charge transfer delay lines

An electrical filter circuit comprising charge transfer devices formed as lines consisting of individual CTD elements formed as four-terminal resonators formed as closed looped circuits and which determine the frequency-dependent transmission behavior of the filter circuit and wherein the four-terminal resonators are interconnected by way of a coupling circuit. In the invention, the filter circuit functions as a separating and shunt circuit and can be formed as an integrated circuit with two end resonators designed as self-contained closed looped circuits.

Electrical filter circuit utilizing charge transfer devices formed as

A switching circuit (2) consisting of CTD lines (p.sub.1,q.sub.1,p.sub.2,q.sub.2,p.sub.3,q.sub.3) is specified in which the properties characteristic for non-unidirectional microwave lines (FIG. 1) are also retained for CTD switching circuits (FIG. 2). To that end, CTD lines (for example, p.sub.1,q.sub.1) exhibiting mutually opposing conducting directions are combined into a line pair and each incoming line (p.sub.1) is connected with each out-going line (q.sub.1). The connection ensues partially via CTD lines (c.sub.1 +c.sub.1 ') and, for the other part, via a galvanic line (L.sub.1). Such switching circuits can be employed for the construction of CTD filters with steepness-increased transmission characteristic and also for the construction of correcting circuits.

Switching circuit consisting of CTD lines

A resonator circuit formed in MOS technology for scanned analog signals, wherein such circuits are constructed for use with accumulators and information processing is accomplished by means of switched capacitors which are charged or respectively connected to each other by way of clock pulse transistors. In the present invention, the realization of general ladder networks or branching circuits for builders in single layer MOS techniques is accomplished by utilizing a second continuous branch which is switched to a first accumulator stage by clock pulse switches and is connected with a reference potential through a capacitor as well as to a further accumulator input through a series switch. The signal series arms are connected with the outputs of the total accumulator arrangement by way of time delay transit elements. The total accumulator arrangement is expanded to a resonator of the type of a four pole network having two inputs to which one respective transmission and one respective reflection output is assigned by utilizing difference elements and transfer elements. The arrangement of the invention is suitable for use as general branching filter circuits, and an increase of the dynamic range by better suppression of the clock pulse pickup and the harmonic distortion of the second order occurs by utilizing push-pull arrangements.

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Munich, Germany

Hermann Betzl