Patent ID: 9692458
Date: 2017-06-27
CPC Classifications: H03M,H04B

Claim:
1. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising: an antenna structure operable to transmit signals and receive signals; a triplexer coupled to the antenna structure and including a plurality of signal paths, each signal path including a bandpass filter that passes a different frequency band than the other bandpass filters and a circulator that provides signal isolation between the transmit signals and the receive signals; a receiver module including a separate signal channel for each of the signal paths in the triplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, wherein each receiver delta-sigma modulator includes a combiner, a low noise amplifier (LNA), an LC filter and a quantizer circuit, said combiner receiving the receive signals from the circulator and a feedback signal from the quantizer circuit and providing an error signal to the LNA to provide an amplified error signal, said amplified error signal being provided to the LC filter to provide a filtered error signal, and the filtered error signal being provided to the quantizer circuit, and wherein the quantizer circuit is an interleaving quantizer circuit that interleaves multiple groups of bits from the filter; and a transmitter module including a transmitter delta-sigma modulator for converting digital data bits to the transmit signals, said transmitter module including a power amplifier and a switch for directing the transmit signals to one of the signal paths in the triplexer.