Patent ID: 9698855
Date: 2017-07-04
CPC Classifications: H03F,H03M,H04B,H04L

Claim:
1. A transceiver front-end circuit for a cellular radio, said transceiver circuit comprising: an antenna operable to receive signals; a multiplexer coupled to the antenna 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; and a receiver module including a separate signal channel for each of the signal paths in the multiplexer, each signal channel in the receiver module including a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal, each delta-sigma modulator including a reconfigurable field programmable analog array (FPAA) having a plurality of gm cells operating as transconductance amplifiers, said FPAA operating as an N-order filter and including a plurality of resonator stages where each stage includes at least two gm cells, a summation junction responsive to output signals from the at least two gm cells and an inductance-capacitance (LC) filter circuit, each delta-sigma modulator further including a coefficient controller operable to activate or deactivate selective ones of the gm cells so as to control a dynamic range of the delta-sigma modulator and/or decrease or increase an order of the delta-sigma modulator.