Wideband sigma delta modulator receiver for fm signal reception

Patent metadata

Field	Value
Publication number	US-2019190533-A1
Application number	US-201715846847-A
Country	US
Kind code	A1
Filing date	Dec 19, 2017
Priority date	Dec 19, 2017
Publication date	Jun 20, 2019
Grant date	—

Abstract

A method and apparatus for utilizing a wideband radio frequency filter to capture an FM frequency band and configuring the characteristics of a delta-sigma modulator in order to processes desired signals within the FM frequency band. Specifically, the system and method are operative to receive a plurality of FM signals within an FM frequency band, filter the frequency band using a wideband filter, modulating the plurality of FM signals using a delta sigma modulator, down converting and processing the desired signals in parallel.

First claim

What is claimed is:

1 . A method for configuring a delta signal modulator comprising:
receiving a first analog signal carrying a first data within a first bandwidth of frequencies; amplifying the first analog signal to generate an amplified analog signal; filtering the amplified analog signal over the first bandwidth of frequencies to generate a filtered analog signal; modulating the filtered analog signal according to a delta sigma modulation to generate a first digital signal; decimating the first digital signal to generate a second digital signal; and processing the second digital signal to extract the first data.

2 . The method of claim 1 further comprising a second analog signal within the first bandwidth of frequencies.

3 . The method of claim 2 wherein the filtered analog signal includes the first analog signal and the second analog signal.

4 . The method of claim 3 wherein processing the second digital signal extracts the first data and rejects a second data carried by a second analog signal within the first bandwidth of frequencies.

5 . The method of claim 1 further comprising reconfiguring the delta signal modulation in response to the first analog signal such that the modulation is centered around a center frequency of the first analog signal.

6 . The method of claim 1 further wherein the amplifying the first analog signal is performed in response to an amplitude of the first analog signal.

7 . The method of claim 1 wherein the delta sigma modulation is operative to capture a plurality of analog signals within the first bandwidth of frequencies and wherein the processing the second digital signal is further operative to extract the first data from only one of the plurality of analog signals.

8 . An apparatus comprising:
an antenna for receiving a first analog signal carrying a first data within a first bandwidth of frequencies; a low noise amplifier for amplifying the first analog signal to generate an amplified analog signal; a filter for filtering the amplified analog signal over the first bandwidth of frequencies to generate a filtered analog signal; a delta sigma modulator for modulating the filtered analog signal to generate a first digital signal; a decimator for down sampling the first digital signal to generate a second digital signal; and a baseband processor for processing the second digital signal to extract the first data.

9 . The apparatus of claim 8 further comprising a second analog signal within the first bandwidth of frequencies.

10 . The apparatus of claim 9 wherein the filtered analog signal includes the first analog signal and the second analog signal.

11 . The apparatus of claim 10 wherein processing the second digital signal extracts the first data and rejects a second data carried by a second analog signal within the first bandwidth of frequencies.

12 . The apparatus of claim 8 further comprising reconfiguring the delta signal modulator in response to the first analog signal such that the modulation is centered around a center frequency of the first analog signal.

13 . The apparatus of claim 8 further wherein the amplifying the first analog signal is performed in response to an amplitude of the first analog signal.

14 . The apparatus of claim 8 wherein the delta sigma modulation is operative to capture a plurality of analog signals within the first bandwidth of frequencies and wherein the processing the second digital signal is further operative to extract the first data from only one of the plurality of analog signals.

15 . A method for filtering a first analog signal from within a first bandwidth of frequencies comprising:
receiving the first frequency modulated analog signal carrying a first data and a second frequency modulated analog signal carrying a second data; filtering the first frequency modulated analog signal and the second frequency modulated analog signal over the first bandwidth wherein the first frequency modulated analog signal is centered at a first frequency within the first bandwidth and the second frequency modulated analog signal is centered at a second frequency within the first bandwidth; delta sigma modulating the first frequency modulated analog signal and the second frequency modulated analog signal to generate a first digital signal; down sampling the first digital signal to generate a baseband digital signal; and processing the baseband digital signal to extract the first data.

16 . The method of claim 15 wherein processing the baseband digital signal extracts the first data and rejects the second data.

17 . The method of claim 15 wherein the first data is an entertainment program.

18 . The method of claim 15 further comprising centering the delta sigma modulation around the first frequency.

19 . The method of claim 15 wherein the down sampling is performed by signal decimation.

20 . The method of claim 15 further comprising processing the baseband digital signal to extract the second data.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Baringer Cynthia D
• Ahmed Mohiuddin
• Kang Jongchan
• Li James Chingwei
• Sovero Emilio A
• Talty Timothy J

Classifications

• H03J2200/11

  Cellular receiver, e.g. GSM, combined with a GPS receiver · CPC title

• H03M3/396 Primary

  among different frequency bands · CPC title

• H04B1/082

  to be used in vehicles (H04B1/086 takes precedence; holding or mounting accessories B60R11/02) · CPC title

• H04B2001/0408

  with power amplifiers · CPC title

• H03M3/42 Primary

  having multiple quantisers arranged in parallel loops · CPC title