Abstract: According to certain embodiments, a system comprises a main transmission line, one or more piezoelectric filters coupled to the main transmission line, and one or more sub-signal transmission lines coupled to the one or more piezoelectric filters. The main transmission line communicates a main signal from an antenna to a main receiver. Each piezoelectric filter selects a sub-signal of a specific center frequency. Each sub-signal transmission line communicates a sub-signal to a sub-signal receiver.

Abstract: According to certain embodiments, a system comprises a main transmission line, one or more piezoelectric filters coupled to the main transmission line, and one or more sub-signal transmission lines coupled to the one or more piezoelectric filters. The main transmission line communicates a main signal from an antenna to a main receiver. Each piezoelectric filter selects a sub-signal of a specific center frequency. Each sub-signal transmission line communicates a sub-signal to a sub-signal receiver.

Abstract: A method of processing an input signal to produce a corrected output signal includes generating a pre-distorted signal by distorting a digital input signal, the distortion based upon characteristics of a main amplifier, and correcting an output signal of the main amplifier to produce the corrected output signal. The output signal of the main amplifier is generated by amplifying the pre-distorted signal with the main amplifier. The correcting is based on a comparison of a signal indicative of the main amplifier output signal and a signal indicative of the digital input signal.

Abstract: A method of processing an input signal to produce a corrected output signal includes generating a pre-distorted signal by distorting a digital input signal, the distortion based upon characteristics of a main amplifier, and correcting an output signal of the main amplifier to produce the corrected output signal. The output signal of the main amplifier is generated by amplifying the pre-distorted signal with the main amplifier. The correcting is based on a comparison of a signal indicative of the main amplifier output signal and a signal indicative of the digital input signal.

Abstract: A quadrature detector includes a driving circuit for applying a frequency modulated square-wave to one input of a gating circuit and to the input of a phase-shift network whose output is connected directly to the other input of the gating circuit. A tracking DC bias voltage is introduced at the input of the gating circuit which is coupled to the output of the phase-shift network, and the level of this DC voltage is selected so that the gating circuit switches on the zero-crossings of the sinusoid outputted by the phase-shift network. This scheme eliminates the need for a limiter used in conventional quadrature detectors that operate from low-voltage power supplies such as a one volt battery.