Band stitching electronic circuits and techniques

摘要

An electronic circuit combines two or more individual wideband RF receivers or transceiver band circuits to produce a usable instantaneous bandwidth that is wider than the bandwidth of the individual band circuits. The electronic circuit overcomes the difficulties of combining bands to provide low signal distortion across the band edges and throughout the combined instantaneous bandwidth of the two or more individual band circuits. This electronic circuit utilizes an amplitude, time delay, and phase adjustment procedure that uses associated adjustable circuitry to eliminate misalignments between the two or more individual band circuits.

主权项

1. An electronic circuit for receiving and processing a signal, comprising:
a first band circuit comprising:
a first down converter configured to receive a signal representative of the received signal and configured to generate a first down converted signal;a first antialias filter coupled to receive a signal representative of the first down converted signal and configured to generate a first antialiased signal, the first antialias filter having a first upper corner frequency and a first lower corner frequency, a span between which is indicative of a first frequency band; anda digital low pass filter coupled to receive a signal representative of the first antialiased signal and configured to generate a low pass filtered signal within the first frequency band; a second band circuit comprising:
a second down converter configured to receive a signal representative of the received signal and configured to generate a second down converted signal;a second antialias filter coupled to receive a signal representative of the second down converted signal and configured to generate a second antialiased signal, the second antialias filter having a second upper corner frequency and a second lower corner frequency, a span between which is indicative of a second different frequency band; anda digital high pass filter coupled to receive a signal representative of the second antialiased signal and configured to generate a high pass filtered signal within the second frequency band,wherein the digital low pass filter comprises a first corner frequency proximate to the first upper corner frequency of the first antialias filter, wherein the digital high pass filter comprises a second corner frequency proximate to the second lower corner frequency of the second antialias filter,wherein a frequency of the first corner frequency of the digital low pass filter is selected to result in a substantial reduction of a changing effect due to a changing characteristic of a low pass rolloff portion of the first antialias filter, and wherein a frequency of the second corner frequency of the digital high pass filter is selected to result in a substantial reduction of a changing effect due to a changing characteristic of a high pass portion of the second antialias filter,wherein the frequency of the first corner frequency of the digital low pass filter is below a frequency of the first upper corner frequency of the first antialias filter, and wherein the frequency of the second corner frequency of the digital high pass filter is above a frequency of the second lower corner frequency of the second antialias filter,wherein at least one of the first band circuit or the second band circuit further comprises an up converter coupled to receive a signal representative of the low pass filtered signal or a signal representative of the high pass filtered signal, respectively, and wherein the up converter is configured to generate an up converted signal; wherein the electronic circuit further comprises: a combiner configured to combine a signal within a frequency band representative of the first frequency band with a signal within a frequency band representative of the second frequency band to generate a combined signal within a wider combined frequency band wider than the first frequency band and wider than the second frequency band, the wider combined frequency band having a band stitching region in which the first and second frequency bands overlap, wherein the digital low pass filter and the digital high pass filter have substantially complimentary phase responses selected to result in the wider combined frequency band having reduced phase response fluctuations and reduced amplitude response fluctuations in the band stitching region.