Daniel W Fisher

US Patent:

7231197, Jun 12, 2007

Filed:

Oct 27, 2000

Appl. No.:

09/696956

Inventors:

Daniel E. Fisher - Silver Spring MD, US

International Classification:

H04B 1/26

US Classification:

455323, 455207, 455214, 455314, 455334, 34235708, 342417

Abstract:

A receiver includes a processor and an RF bridge. The RF bridge is coupled to the processor to receive a reference signal from the processor. The RF bridge includes first and second frequency converters coupled to respective first and second antennas. The RF bridge also includes a third frequency converter coupled to outputs of the first and second frequency converters. In an alternative receiver the processor is coupled to receive an information signal from the RF bridge. The processor includes a digital frequency source to generate the reference signal based on a signal from a clock source and circuitry to detect a frequency difference from the information signal based on the signal from the clock source. In a variant, the circuitry to detect includes a first Fourier transformer having a first center frequency and a second Fourier transformer having a second center frequency different than the first center frequency.

US Patent:

7599678, Oct 6, 2009

Filed:

Jun 7, 2007

Appl. No.:

11/808145

Inventors:

Daniel E. Fisher - Aldie VA, US

International Classification:

H04B 1/26

US Classification:

455323, 455 6716, 455207, 342156, 342407

Abstract:

A receiver includes an RF bridge and a processor coupled to the RF bridge to receive an information signal from the RF bridge. The processor includes a clock source and a processor front end. The processor front end includes first and second frequency sources, a processor down converter and an analog to digital converter. The first frequency source generates a reference signal based on a signal from the clock source. The reference signal is coupled to the RF bridge. The second frequency source generates a first local oscillator signal based on the signal from the clock source. The processor down converter heterodynes the first local oscillator signal and the information signal. The analog to digital converter is coupled to the processor down converter and provides a digitized down converted signal.

US Patent:

20070259636, Nov 8, 2007

Filed:

May 24, 2007

Appl. No.:

11/802604

Inventors:

Daniel Fisher - Aldie VA, US

International Classification:

H04B 1/16

US Classification:

455207000

Abstract:

An RF bridge coupled to a processor receives a reference signal from the processor. The RF bridge includes first and second frequency converters coupled to respective first and second antennas, and a frequency source coupled to the first frequency converter. In one example, the RF bridge also includes a doubly balanced mixer coupled to the reference signal and coupled between the frequency source and the second frequency converter. In another example, the RF bridge includes either a single sideband frequency converter coupled to the reference signal and coupled between the frequency source and the second frequency converter.