Boeing has been granted a patent for an analog Infinite Impulse Response (IIR) filter that samples radio frequency (RF) signals. The filter includes amplifiers, time-delay circuits, variable gain amplifiers, and power combiners to generate a single output signal. The patent describes a method and apparatus for implementing this filter. GlobalData’s report on Boeing gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Analog iir filter for sampling rf signals
A recently granted patent (Publication Number: US11689393B1) describes an analog Infinite Impulse Response (IIR) filter for sampling radio frequency (RF) signals. The filter includes an amplifier that receives the RF signal and generates a positive output signal and a negative output signal. The positive output signal is delayed by a first time-delay circuit and amplified by a first set of variable gain amplifiers to establish a first set of coefficients. Similarly, the negative output signal is delayed by a third time-delay circuit and amplified by a third set of variable gain amplifiers to establish a third set of coefficients.
The delayed positive output signals and delayed negative output signals are combined using a set of power combiner components, which function as sum junctions. This combination reduces the total number of coefficients in the analog output signal. The patent also describes the use of selectively switchable time-delay circuits, allowing for the modification of the delay time.
The analog IIR filter can be implemented as an analog bi-quad filter in either direct form one or direct form two. In direct form one, the positive output signal is amplified by a second set of variable gain amplifiers to establish a second set of coefficients. In direct form two, the positive output signal is amplified by both the first and second subsets of variable gain amplifiers to establish the first and second sets of coefficients, respectively. Similarly, in both forms, the negative output signal is amplified by the third and fourth subsets of variable gain amplifiers to establish the third and fourth sets of coefficients, respectively.
The method for analog IIR filtering of RF signals involves generating positive and negative output signals, causing a predetermined time-delay using time-delay circuits, amplifying the output signals using variable gain amplifiers, and combining the delayed positive and negative output signals using power combiner components. This method also includes the summation of delayed positive and negative output signals to reduce the total number of coefficients in the analog output signal. Additionally, the method allows for the attenuation of selected coefficients to render them negligible when summed with corresponding unattenuated coefficients.
Overall, this patent presents an analog IIR filter design that offers flexibility in delay time modification, reduces the number of coefficients in the output signal, and provides options for attenuation of specific coefficients.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
