Wideband receiver architecture tolerant to in-band interference
A wideband receiver circuit is disclosed that includes a signal input configured to receive a spectrum signal of bandwidth B that contains an RF signal and an interference signal. A down conversion module is connected to the signal input and has N down conversion channels, wherein each of the N down conversion channels is configured to down convert the spectrum signal to one of N decimated baseband signals by processing the spectrum signal with one distinct phase of a sequence of length N and period N/fclk=N/2B to generate a baseband output signal. An amplifier circuit is connected to each of the N down conversion channels, and is configured to amplify the baseband output signal. A digital signal processing module including an analog to digital conversion circuit is connected to each amplifier circuit and is configured to convert the amplified baseband output signal to N digital signals. The digital signal processing module also having a digital reconstruction processor to combine each of the N digital signals and generate a reconstructed RF signal.
1. A wideband receiver circuit comprising:
a signal input configured to receive a spectrum signal of bandwidth B that contains an RF signal and an interference signal;
a down conversion module connected to the signal input and having N down conversion channels, wherein each of the N down conversion channels is configured to down convert the spectrum signal to one of N decimated baseband signals by processing the spectrum signal with one distinct phase of a sequence of length N and period N/f clk =N/2B to generate a baseband output signal, wherein f clk is a clock period for the wideband receiver circuit;
an amplifier circuit connected to each of the N down conversion channels, wherein the amplifier circuit is configured to amplify the baseband output signal; and
a digital signal processing module having an analog to digital conversion circuit connected to each amplifier circuit and configured to convert the amplified baseband output signal to N digital signals, and a digital reconstruction processor to combine each of the N digital signals and generate a reconstructed RF signal.
2. The wideband receiver circuit of claim 1 , wherein each of the N down conversion channels includes a mixer circuit, wherein each mixer circuit is configured to process the spectrum signal with a local oscillator signal and generate a baseband signal, and wherein the local oscillator signal is one distinct phase of the sequence of length N and period N/f clk =N/2B.
3. The wideband receiver circuit of claim 2 , wherein each of the N down conversion channels includes an integration circuit, and wherein each integration circuit receives the baseband signal from the mixer circuit and further processes the baseband signal by performing an averaging function over a sequence period, T s =N/2B, and then sampling the baseband signal at the end of each sequence period to generate a sampled baseband output signal.
4. The wideband receiver circuit of claim 3 , wherein the integration circuit is a switched capacitor circuit that performs the averaging function.
5. The wideband receiver circuit of claim 1 , wherein the sequence is a 2 N −1 pseudo-random bit sequence (PRBS).
6. The wideband receiver circuit of claim 1 , wherein signal swings of the baseband output signal have been suppressed.
7. The wideband receiver circuit of claim 1 , wherein the down conversion module further comprises a discrete-time signal processing module.
8. A wideband receiver circuit comprising:
a signal input configured to receive a spectrum signal of bandwidth B that contains one or more desired RF signal components and undesired noise and/or interference components, wherein the undesired components may be stronger than the RF signal components;
a down conversion module connected to the signal input and having N down conversion channels, wherein each of the N down conversion channels is configured to down convert the spectrum signal to one of N decimated baseband signals,
wherein each of the N down conversion channels includes a mixer circuit configured to process the spectrum signal with a local oscillator signal and generate a baseband signal, wherein the local oscillator signal is one distinct phase of a sequence of length N and period N/f clk =N/2B and wherein f clk is a clock period for the wideband receiver circuit,
wherein each of the N down conversion channels further includes an integration circuit, wherein each integration circuit receives the baseband signal from the mixer circuit and further processes the baseband signal by performing an averaging function over a sequence period, T s =N/2B, and then sampling the baseband signal at the end of each sequence period to generate a sampled baseband output signal;
a baseband amplifier circuit connected to each of the N down conversion channels wherein the baseband amplifier is configured to amplify the sampled baseband output signal from the integration circuit; and
a digital signal processing module having an analog to digital conversion circuit connected to each baseband amplifier circuit and configured to convert the amplified baseband output signal to N digital signals, and a digital reconstruction processor to combine each of the N digital signals and generate a reconstructed RF signal.
9. The wideband receiver circuit of claim 8 , wherein the integration circuit is a switched capacitor circuit that performs the averaging function.
10. The wideband receiver circuit of claim 8 , wherein the sequence is a 2 N −1 pseudo-random bit sequence (PRBS).
11. The wideband receiver circuit of claim 8 , wherein signal swings of the sampled baseband output signal have been suppressed.
12. The wideband receiver circuit of claim 8 , wherein the down conversion module further comprises a discrete-time signal processing module.