Various signal processing techniques may benefit from appropriate handling. For example, certain signal processors may benefit from quarter wavelength unit delay and complex weight coefficient continuous-time filters. A method can include splitting an input signal into a plurality of signal paths. The method can also include complex weighting, for each signal path, a respective signal. The method can further include summing outputs of the signal paths. The method can additionally include providing an output comprising the sum of the signal paths. The complex weighting can be configured to independently control gain, phase and delay of the output signal over broadband.

Various signal processing techniques may benefit from appropriate handling. For example, certain signal processors may benefit from quarter wavelength unit delay and complex weight coefficient continuous-time filters. A method can include splitting an input signal into a plurality of signal paths. The method can also include complex weighting, for each signal path, a respective signal. The method can further include summing outputs of the signal paths. The method can additionally include providing an output comprising the sum of the signal paths. The complex weighting can be configured to independently control gain, phase and delay of the output signal over broadband.

A remote antenna system is provided. The remote antenna system comprises an antenna controller circuit and a remote antenna circuit coupled to the antenna controller circuit by a cable. The remote antenna system further comprises a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit. The control path is a bidirectional control path. The control path comprises a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

A remote antenna system is provided. The remote antenna system comprises an antenna controller circuit and a remote antenna circuit coupled to the antenna controller circuit by a cable. The remote antenna system further comprises a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit. The control path is a bidirectional control path. The control path comprises a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

A remote antenna system is provided. The remote antenna system comprises an antenna controller circuit and a remote antenna circuit coupled to the antenna controller circuit by a cable. The remote antenna system further comprises a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit. The control path is a bidirectional control path. The control path comprises a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

A remote antenna system is provided. The remote antenna system comprises an antenna controller circuit and a remote antenna circuit coupled to the antenna controller circuit by a cable. The remote antenna system further comprises a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit. The control path is a bidirectional control path. The control path comprises a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

A cable network system for bidirectionally communicating signals at an enhanced duplex frequency range, which may be between about 5 MHz and about 650 MHz. This system may include a first amplifier, which may be configured to condition an upstream signal proceeding from a subscriber premises to a headend, without necessarily conditioning a downstream signal proceeding from the headend to the subscriber premises, a second amplifier, which may be configured to condition the downstream signal without necessarily conditioning the upstream signal, and a shaping circuit, which may condition the upstream and downstream signals. This system also may simultaneously, or in an overlapping or offset manner, communicate signals at a full duplex frequency range without a diplex filter.

A cable network system for bidirectionally communicating signals at an enhanced duplex frequency range, which may be between about 5 MHz and about 650 MHz. This system may include a first amplifier, which may be configured to condition an upstream signal proceeding from a subscriber premises to a headend, without necessarily conditioning a downstream signal proceeding from the headend to the subscriber premises, a second amplifier, which may be configured to condition the downstream signal without necessarily conditioning the upstream signal, and a shaping circuit, which may condition the upstream and downstream signals. This system also may simultaneously, or in an overlapping or offset manner, communicate signals at a full duplex frequency range without a diplex filter.

A voltage converter can be switched among two or more modes to produce an output voltage tracking a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. One or more voltages generated from a power supply voltage, such as a battery voltage, can be compared with the reference voltage to determine whether to adjust the mode. The reference voltage can be independent of the power supply voltage. Further, the voltage converter may implement frequency modulation and a pulse skipping mode to improve the efficiency of switching operational states of the voltage converter.

A decision feedback equalizer of an electric signal transmission apparatus has an average peak value determiner that receives an output of an adder and a threshold value set by a program. An average peak value of the output of the adder), compares a magnitude relation of the detected average peak value and the threshold value, increases the reference value of the output of a reference value generation circuit from an initial value set by the program and causes resolutions of DACs to become coarse from the initial value, when the average peak value is larger than the threshold value, and decreases the reference value of the output of the reference value generation circuit from the initial value set by the program and causes the resolutions of the DACs to become fine from the initial value, when the average peak value is smaller than the threshold value.