Patent ID: 7277491
Filing Date: 2007-10-02
Classification: H01F,H04L

Abstract:
1. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination: an HF transformer having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to first port of said HF transformer, said first modulator modulating a first 1-bit digital signal to a first analog pass band signal within said desired frequency range and transmitting the modulated signal to said HF transformer; a first demodulator coupled to said first second port of said HF transformer, said demodulator demodulating said first analog pass band signal to recover said first 1-bit digital signal for transmission to said line side circuit; wherein said first modulator is coupled to said HF transformer through a first HF hybrid circuit and said HF transformer is coupled to said first demodulator through a second HF hybrid circuit; a second modulator coupled to said second port of said HF transformer through said second HF hybrid circuit, said second modulator modulating a second 1-bit digital signal to a second analog pass band signal within said desired frequency range and transmitting it to said HF transformer; a second demodulator coupled to said first port of said HF transformer through said first HF hybrid circuit, said second demodulator demodulating said second analog pass band signal to recover said second 1-bit digital signal for transmission to said system side circuit; and wherein the line side circuit includes an analog portion of a sigma-delta codec, said analog portion converting an analog receive signal to a third 1-bit digital signal; and wherein the line side circuit includes a second multiplexor connected to said second modulator, receiving digital status signals and said third 1-bit digital signal, said multiplexor combining said digital status signals and said third 1-bit digital signal to form said second 1-bit digital signal.