Ground isolation circuit for isolating a transmission line from

Details Ground isolation circuit for isolating a transmission line from Ground isolation circuit for isolating a transmission line from

1996-02-01

1998-11-24

Faile, Andrew I.

Television

Special applications

Manufacturing

455 61, 455326, 375258, H04N 710, H04B 126

Patent

active

058414673

ABSTRACT:
An isolation circuit is disclosed for isolating ground interference from a wideband transmission signal. The ground isolation circuit of the present invention is constructed using a pair of matched mixer circuits, each of which receives a carrier signal from the same oscillator circuit. The first mixer circuit also receives the baseband signal input after appropriate conditioning, and modulates the baseband signal onto the carrier signal. In the preferred embodiment, the carrier signal has a predetermined frequency which is at least two times the frequency of the baseband signal. The modulated signal (which preferably comprises an rf signal) is transmitted via an rf transmission line to the second mixer, which demodulates the rf signal to recover the baseband signal. Each port of the mixer circuits connects to an isolation transformer to insure isolation from ground interference.

REFERENCES:
patent: 3652941 (1972-03-01), Neuf
patent: 4430758 (1984-02-01), Snyder
patent: 4536618 (1985-08-01), Serrano
patent: 4669038 (1987-05-01), Whitford
patent: 4812849 (1989-03-01), Otto
patent: 5361074 (1994-11-01), Hansen
patent: 5574749 (1996-11-01), Nelson et al.
patent: 5606734 (1997-02-01), Bahu

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