Single ended analog front end
AssigneeBroadcom Corporation
InventorsRaphael Rahamim, Daniel Marz
Life of this patent
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Abstract
An analog front end. The analog front end comprises a converter configured to convert a differential input signal to a single-ended input signal, and convert a single-ended output signal to a differential output signal. And a transformer configured to couple the differential input signal from a twisted pair telephone line to the converter, and couple the differential output signal from the converter to the twisted pair telephone line.
Claims45
An analog front end for a digital subscriber line (DSL) modem, the analog front end comprising:
- a single-ended receive channel configured to receive and process a differential input signal from a twisted pair telephone line that has been converted to a single-ended input signal;
- a single-ended transmit channel;
- a converter configured to convert the differential input signal from the twisted pair telephone line to the single-ended input signal for the receive channel, and convert a single-ended output signal from the transmit channel to a differential output signal for transmission on the twisted pair telephone line;
- an automatic gain control amplifier having a single-ended input coupled to the single-ended receive channel, and a single-ended output, wherein the automatic gain control amplifier is configured to receive an automatic gain control signal;
- a single-ended first filter coupled to the automatic gain control output;
- and
- a single-ended second filter coupled to the transmit channel for filtering the single-ended output signal before conversion to the differential output signal for transmission on the twisted pair telephone line.
An analog front end for a digital subscriber line (DSL) modem, the analog front end comprising:
- receive means for receiving a single-ended input signal, the single-ended input signal having been converted from a differential input signal from a twisted pair telephone line;
- transmit means for transmitting a single-ended output signal;
- converter means for converting the differential input signal from the twisted pair telephone line to the single-ended input signal for the receive means, and converting the single-ended output signal from the transmit means to a differential output signal for transmission on the twisted pair telephone line;
- an automatic gain control amplifier means having a single-ended input means coupled to the single-ended receive means, and a single-ended output means, wherein the automatic gain control amplifier means is configured to receive an automatic gain control signal;
- a single-ended first filtering means coupled to the automatic gain control means;
- and
- a single-ended second filtering means coupled to the transmit means for filtering the single-ended output signal before conversion to the differential output signal for transmission on the twisted pair telephone line.
A method of interfacing to a twisted pair telephone line in digital subscriber line (DSL) modem, comprising:
- receiving first information, comprising:
- receiving a differential input signal from a twisted pair telephone line, where the differential input signal includes the first information;
- converting the differential input signal to a single-ended input signal;
- and
- amplifying the single-ended input signal;
- and
- filtering the single-ended input signal;
- transmitting second information, comprising:
- filtering a single-ended output signal, wherein the single-ended output signal includes the second information;
- converting the filtered single-ended output signal to a differential output signal;
- and
- transmitting the differential output signal over the twisted pair telephone line.
Dependencies are inferred from the claim text.