PROGRAMMABLE, FREQUENCY AGILE DIRECT CONVERSION DIGITAL RECEIVER WITH HIGH SPEED OVERSAMPLING

• US 20130101074A1
• Filed: 04/11/2012
• Published: 04/25/2013
• Est. Priority Date: 04/11/2011
• Status: Active Grant

• Current Assignee: RFdirect Corp.
• Original Assignee: Softwaveradio, Inc.
• Inventors: Hickling, Ronald M.
• Granted Patent: US 8,913,698 B2
• Time in Patent Office: Days
• US Class Current: 375/350
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference

Abstract

The invention described herein is directed to different embodiments of a wireless communications device that can be used in many different applications, such as but not limited to a digital oversampling receiver adapted to select desired signals and to reject undesired signals. In one embodiment, a wireless communications device is disclosed that comprises an architecture for a receiver front end that obviates the need for high order passive circuitry or RC active circuitry to select desired signals and to reject undesired signals.

Claims

1. A circuit employed in a receiver comprising:

a clock;

an N stage ring counter coupled to said clock;

an N path switching network;

at least one predictive coder, wherein a respective one of said at least one predictive coder is coupled to a respective switch of said N path switching network; and

a digital filter configured to receive an output signal from each of said at least one predictive coder.

2. The circuit employed in the receiver of claim 1, wherein said N stage ring counter is configured to produce a clock signal for said N path switching network and said at least one predictive coder.

3. The circuit employed in the receiver of claim 1, wherein said N path switching network comprises at least one switch adapted to receive an input signal.

4. A method of receiving a wireless transmission comprising the steps of:

programming a count pattern into an N stage ring counter;

producing an N-cycle digital waveform;

combining said N-cycle digital waveform with said wireless transmission;

oversampling said combined digital waveform and said wireless transmission to form a high speed serial stream, said high speed serial stream comprised of a signal of interest and a quantization noise signal;

suppressing said quantization noise signal; and

converting said high speed data stream into a lower speed data stream.