General Instrument Corporation

Arris Enterprises LLC

Minirf, Inc.

Arris International IP Ltd

Rudolph J Menna

Philip Miguelez

Robert J Thompson

John L Moran, Iii

Christopher Jeblonski

David C Hartrum

Shutong Zhou

Amarildo Vieira

Timothy Cope

Methods and systems capable of improving the transmission of data along an upstream path of a Hybrid Fiber-Coaxial Cable Network, from a transmitter in a node to a receiver in a Cable Modem Termination System.

CATV digital transmission with bandpass sampling

An apparatus includes a plurality of ports, a directional coupler transformer and an impedance circuit. The directional coupler transformer may be configured to (i) receive a forward input signal from a first port of the plurality of ports, (ii) generate a coupled signal at a second port of the plurality of ports, (iii) generate a forward output signal and receive a return signal at a third port of the plurality of ports and (iv) generate an internal signal at an internal node. The impedance circuit may be directly connected to the internal node and configured to direct the internal signal to a signal ground to control an isolation between the forward input signal and the return input signal. The isolation is controlled by an impedance of the impedance circuit.

Directional coupler assembly

CATV digital transmission with BandPass sampling

In general, in one aspect, the disclosure describes a resonance restricting material in communication with a bypass line of a cable television tap. The bypass line generates resonances at a defined frequency in response to RF parameters in the tap and the resonances increase insertion losses at the defined frequency and precludes bandwidth of the tap being increased above the defined frequency. The resonance restricting material may attenuate the resonances generated by the bypass line at the defined frequency (e.g., approximately 1.2 GHz) and reduce insertion losses at the defined frequency and enable the bandwidth of the tap to be increased (e.g., from 1.0 GHz to 1.8 GHz).

Increased cable television tap bandwidth utilizing existing tap housings

In general, in one aspect, the disclosure describes a resonance restricting material in communication with a bypass line of a cable television tap. The bypass line generates resonances at a defined frequency in response to RF parameters in the tap and the resonances increase insertion losses at the defined frequency and precludes bandwidth of the tap being increased above the defined frequency. The resonance restricting material may attenuate the resonances generated by the bypass line at the defined frequency (e.g., approximately 1.2 GHz) and reduce insertion losses at the defined frequency and enable the bandwidth of the tap to be increased (e.g., from 1.0 GHz to 1.5 GHz).

Integrated balun and coupler is described. In one example, a radio frequency (RF) device includes a balun and coupler. The balun includes a first winding and a second winding arranged on a magnetic core. Respective inputs of the first winding and the second winding are configured to receive a balanced RF input and respective outputs of the first winding and the second winding are configured to provide a first unbalanced RF output. The coupler includes a third winding arranged on the magnetic core. The third winding is configured to provide a second unbalanced RF output, where the second unbalanced RF output is a fraction of the first unbalanced RF output.

Integrated balun and coupler transformer

The RF transformer of the present invention couples a transmission line between a magnetic transformer and a balun. The location and function of the transmission line improves frequency response across a wide operational bandwidth by permitting the circuit to be tuned, thereby providing a greater degree of impedance matching.

RF balun and transformer with shunt compensation transmission line

An in-line distortion generator is coupled to an RF amplifier on a single PC board for producing an output signal of useful amplitude but with low composite triple beat and cross modulation distortions. The backplane under the section of the PC board upon which the distortion circuit resides is removed and the portion of the heat sink under the removed portion of the backplane is also removed. This eliminates any parasitic capacitances that could degrade the performance of the RF amplifier, thereby making the distortion circuit transparent to the RF amplifier. Furthermore, the layout of the predistortion circuitry has been specifically designed to enhance the performance of the circuitry without inducing any negative operating characteristics on the associated RF amplifier.

Predistortion generator coupled with an RF amplifier

The present invention incorporates GaAs field effect transistors (GaAsFETs) in a radio frequency (RF) ultra-linear amplifier. The described amplifier circuit is a transformer-coupled single input, signal processing unit incorporating ultra-fast, GaAsFETs in a three active device cascode. This arrangement allows for a higher working voltage to be applied across the three semiconductors rather than a traditional two transistor cascode. The operational bandwidth can process a mixed modulation signal comprised of analog and digital channels.

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Harleysville, PA, United States of America

Rudolph J Menna