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Apparatus-and-method-for-automatic-mode-selection-in-a-communications-receiver

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Apparatus and method for automatic mode selection in a communications receiver

Details

Inventors: North, Brian B.;
Assignee: Integration Associates, Inc. (Mountain View, CA)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Bayard; Emmanuel
Attorney, Agent or Firm: McDonnell Boehen Hulbert & Berghoff, Francissen; Vernon W.

A method and apparatus are shown for automatically adjusting a response bandwidth and input sensitivity of a communications receiver responsive to a frequency of a received data signal. The response bandwidth is adjusted by switching a low pass filter into a receive path of the receiver when the received data signal is a low speed data signal and switching the low pass filter out of the receive path when the received data signal is a high speed data signal. The input sensitivity is adjusted by either changing a detection threshold of a comparator in the receive path or varying a gain of an input amplifier in the receive path. The high speed data signal is discerned when the low pass filter limits the response bandwidth of the receiver by a mode selection circuit which examines the duration of multiple pulses in a pulse train in the received data signal.

DETAILED DESCRIPTION The present invention relates to an apparatus and method for automatically selecting an operating mode of a communications receiver based upon the operating mode of a received transmission signal.
An embodiment of a receiver circuit, according to the present invention, includes a circuit input terminal configured to receive an input data signal, a circuit output terminal, an input amplifier having input and output terminals, the input terminal of the input amplifier being coupled to the circuit input terminal, and a first comparator having first and second input terminals and an output terminal, the first input terminal being coupled to the output terminal of the input amplifier, the second input terminal being configured to receive a detection threshold voltage, and the output terminal of the first comparator being coupled to the circuit output terminal.
The receiver also includes a filter and a switch coupled in series with the filter between the output terminal of the input amplifier and a first power supply rail, wherein the switch is configured to switch to a first position responsive to receiving a low speed mode control signal at a control terminal of the switch, and further wherein the switch is configured to switch to a second position responsive to receiving a high speed mode control signal at the control terminal of the switch.
A mode selection circuit is configured to generate the low speed mode control signal responsive to a low speed data signal generated at the output of the first comparator responsive to the input data signal and generate the high speed mode control signal responsive to a low speed data signal generated at the output of the first comparator responsive to the input data signal.
An embodiment of a method, according to the present invention, for receiving high and low speed signals in a receiver involves providing a receive path configured to receive an input data signal, wherein the input data signal includes one of the high speed signal and the low speed signal

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