US 11,811,440 B2
System and method for cancelation of internally generated spurious signals in a broadband radio receiver
William B. Sorsby, Cedar Rapids, IA (US)
Assigned to Rockwell Collins, Inc., Cedar Rapids, IA (US)
Filed by Rockwell Collins, Inc., Cedar Rapids, IA (US)
Filed on May 21, 2021, as Appl. No. 17/326,978.
Prior Publication US 2022/0376723 A1, Nov. 24, 2022
Int. Cl. H04B 1/12 (2006.01)
CPC H04B 1/12 (2013.01) 6 Claims
OG exemplary drawing
 
1. A spur canceler circuit for a signal receiver system, comprising:
at least one frequency generator configured to:
generate at least one reference frequency associated with a plurality of receiver components of the receiver system, the plurality of receiver components capable of introducing a plurality of spurious products into a signal received by the receiver system, the plurality of receiver components including an analog-digital converter (ADC) configured to generate a digitized signal based on the received signal and capable of introducing a first spurious product, the plurality of receiver components of the receiver system including at least one internal clock capable of introducing a second spurious product, the plurality of receiver components including an oscillator capable of introducing a third spurious product, wherein the first spurious product, the second spurious product, and the third spurious product are generated based on the at least one reference frequency, one or more harmonic orders, and one or more cross-products, the at least one reference frequency, the one or more harmonic orders, and the one or more cross-products being stored in memory to allow exact duplication,
and
generate a plurality of duplicate spurious products based on the at least one reference frequency, the one or more harmonic order, and the one or more cross-products, a first duplicate spurious product of the plurality of duplicate spurious products corresponding to the first spurious product, a second duplicate spurious product of the plurality of duplicate spurious products corresponding to the second spurious product, a third duplicate spurious product of the plurality of duplicate spurious products corresponding to the third spurious product;
and
at least one canceler circuit configured to:
receive the plurality of digitized signals corresponding to the received signal and including the plurality of introduced spurious products;
for each introduced spurious product, 1) isolate the introduced spurious product from the digitized signal and 2) adjust the corresponding duplicate spurious product to cancel out the introduced spurious product from the digitized signal;
and
generate a desired output signal free of the introduced spurious products by adding each adjusted duplicate spurious product to the digitized signal.