Radio frequency filtering technique with auto calibrated stop-band rejection
First Claim
Patent Images
1. A method for filtering a radio frequency (RF) signal, comprising:
- amplifying a first RF communication signal in a first signal path;
filtering the first RF communication signal in a second signal path, said filtering the first RF communication signal in the second signal path includingdown-converting the first RF communication signal to a down-converted signal,high pass filtering the down-converted signal, andup-converting the high pass filtered down-converted signal to a second RF communication signal;
adjusting a signal phase in the second signal path; and
subtracting the second RF communication signal from the amplified first RF communication signal to generate a third RF communication signal;
wherein said down-converting the first RF communication signal to a down-converted signal comprisesdown-converting the first RF communication signal to a first I-phase down-converted signal,down-converting the first RF communication signal to a first Q-phase down-converted signal,down-converting the first RF communication signal to a second I-phase down-converted signal, anddown-converting the first RF communication signal to a second Q-phase down-converted signal;
wherein said high pass filtering the down-converted signal compriseshigh pass filtering the first I-phase down-converted signal,high pass filtering the first Q-phase down-converted signal,high pass filtering the second I-phase down-converted signal, andhigh pass filtering the second Q-phase down-converted signal;
wherein said adjusting a signal phase in the second signal path comprisesscaling the high pass filtered first I-phase down-converted signal according to a first scale factor,scaling the high pass filtered first Q-phase down-converted signal according to a second scale factor,combining the scaled high pass filtered first I-phase down-converted signal and the scaled high pass filtered first Q-phase down-converted signal to generate a first combined signal,scaling the high pass filtered second I-phase down-converted signal according to an inverted version of the second scale factor,scaling the high pass filtered second Q-phase down-converted signal according to the first scale factor, andcombining the scaled high pass filtered second I-phase down-converted signal and the scaled high pass filtered second Q-phase down-converted signal to generate a second combined signal; and
wherein said up-converting the high pass filtered down-converted signal to a second RF communication signal comprisesup-converting the first combined signal to an I-phase RF communication signal,up-converting the second combined signal to a Q-phase RF communication signal, andcombining the I-phase RF communication signal and the Q-phase RF communication signal to generate the second RF communication signal.
7 Assignments
0 Petitions
Accused Products
Abstract
Methods, systems, and apparatuses for filtering received radio frequency signals are provided. A first RF communication signal is received that includes a desired information signal portion and an undesired blocker signal portion that is offset in frequency from the desired portion. The first RF communication signal is amplified in a first signal path and is filtered in a second signal path. The filtering of the first RF communication signal in the second signal path includes: down-converting the first RF communication signal to a down-converted signal, high pass filtering the down-converted signal, and up-converting the high pass filtered down-converted signal to a second RF communication signal. The filtering of the first RF communication signal filters out the desired information signal portion from the second signal path. A signal phase is adjusted in the second signal path to match phase shifts between the first and second signal paths. The second RF communication signal is subtracted from the amplified first RF communication signal to generate a third RF communication signal. Third RF communication signal includes the desired information signal portion but does not include the blocker signal, which is canceled during the subtraction.
26 Citations
16 Claims
-
1. A method for filtering a radio frequency (RF) signal, comprising:
-
amplifying a first RF communication signal in a first signal path; filtering the first RF communication signal in a second signal path, said filtering the first RF communication signal in the second signal path including down-converting the first RF communication signal to a down-converted signal, high pass filtering the down-converted signal, and up-converting the high pass filtered down-converted signal to a second RF communication signal; adjusting a signal phase in the second signal path; and subtracting the second RF communication signal from the amplified first RF communication signal to generate a third RF communication signal; wherein said down-converting the first RF communication signal to a down-converted signal comprises down-converting the first RF communication signal to a first I-phase down-converted signal, down-converting the first RF communication signal to a first Q-phase down-converted signal, down-converting the first RF communication signal to a second I-phase down-converted signal, and down-converting the first RF communication signal to a second Q-phase down-converted signal; wherein said high pass filtering the down-converted signal comprises high pass filtering the first I-phase down-converted signal, high pass filtering the first Q-phase down-converted signal, high pass filtering the second I-phase down-converted signal, and high pass filtering the second Q-phase down-converted signal; wherein said adjusting a signal phase in the second signal path comprises scaling the high pass filtered first I-phase down-converted signal according to a first scale factor, scaling the high pass filtered first Q-phase down-converted signal according to a second scale factor, combining the scaled high pass filtered first I-phase down-converted signal and the scaled high pass filtered first Q-phase down-converted signal to generate a first combined signal, scaling the high pass filtered second I-phase down-converted signal according to an inverted version of the second scale factor, scaling the high pass filtered second Q-phase down-converted signal according to the first scale factor, and combining the scaled high pass filtered second I-phase down-converted signal and the scaled high pass filtered second Q-phase down-converted signal to generate a second combined signal; and wherein said up-converting the high pass filtered down-converted signal to a second RF communication signal comprises up-converting the first combined signal to an I-phase RF communication signal, up-converting the second combined signal to a Q-phase RF communication signal, and combining the I-phase RF communication signal and the Q-phase RF communication signal to generate the second RF communication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system for filtering a radio frequency (RF) signal, comprising:
-
an amplifier in a first signal path, wherein the amplifier is configured to amplify a first RF communication signal; a receiver translational circuit in a second signal path, wherein the receiver translational signal is configured to filter the first RF communication signal to a second RF communication signal; and a subtractor configured to subtract the second RF communication signal from the amplified first RF communication signal to generate a third RF communication signal; wherein the receiver translational circuit includes a phase adjustor configured to adjust a signal phase in the second signal path; wherein the receiver translational circuit comprises a first down-converter configured to down-convert the first RF communication signal to a first I-phase down-converted signal, a second down-converter configured to down-convert the first RF communication signal to a first Q-phase down-converted signal, a third down-converter configured to down-convert the first RF communication signal to a second I-phase down-converted signal, a fourth down-converter configured to down-convert the first RF communication signal to a second Q-phase down-converted signal, a first high pass filter configured to high pass filter the first I-phase down-converted signal, a second high pass filter configured to high pass filter the first Q-phase down-converted signal, a third high pass filter configured to high pass filter the second I-phase down-converted signal, a fourth high pass filter configured to high pass filter the second Q-phase down-converted signal, a first scaler configured to scale the high pass filtered first I-phase down-converted signal according to a first scale factor, a second scaler configured to scale the high pass filtered first Q-phase down-converted signal according to a second scale factor, a first combiner configured to combine the scaled high pass filtered first I-phase down-converted signal and the scaled high pass filtered first Q-phase down-converted signal to generate a first combined signal, a third scaler configured to scale the high pass filtered second I-phase down-converted signal according to an inverted version of the second scale factor, a fourth scaler configured to scale the high pass filtered second Q-phase down-converted signal according to the first delay factor, a second combiner configured to combine the scaled high pass filtered second I-phase down-converted signal and the scaled high pass filtered second Q-phase down-converted signal to generate a second combined signal, a first up-converter configured to up-convert the first combined signal to an I-phase RF communication signal, a second up-converter configured to up-convert the second combined signal to a Q-phase RF communication signal, and a third combiner configured to combine the I-phase RF communication signal and the Q-phase RF communication signal to generate the second RF communication signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeAvago Technologies International Sales Pte Limited (Broadcom, Inc.)
-
Original AssigneeBroadcom Corporation (Broadcom, Inc.)
-
InventorsDarabi, Hooman
-
Primary Examiner(s)Urban; Edward
-
Assistant Examiner(s)HU, RUI MENG
-
Application NumberUS11/931,438Publication NumberTime in Patent Office1,224 DaysField of Search455/278.1, 455283-287, 455/296, 455304-307, 455/303US Class Current455/304CPC Class CodesH04B 1/1036 with automatic suppression ...H04B 1/123 using adaptive balancing or...
