US 6,311,044 B1Granted

Method and apparatus for determining failure modes of a transceiver

AssigneeMotorola, Inc.

InventorsDavid Wilde, John Kelley

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Abstract

A method for determining failure modes of a transceiver (100) includes applying a control signal (121) to a transmitter (130) of transceiver (100). The power level of a transmit signal (131) is proportional to a predetermined voltage level of control signal (121), and is detected by a detector (132) which correspondingly produces a transmit power level indicator (133). A portion of transmit signal (131) is coupled to produce a coupled transmit signal (111) which is received by a receiver (110) of transceiver (100). Receiver (111) produces a receive signal strength indicator (112) corresponding to the power level of coupled transmit signal (111). Voltage levels of received signal strength indicator (112), transmit power level indicator (133) and predetermined voltage level of control signal (121) are stored in a memory means 125, and compared in a controller 126 to determine failure modes of receiver (110) and transmitter (130).

Claims15

Dependent claims

A method for determining failure mode of a transceiver, comprising the steps of:

applying a control signal at a predetermined voltage level to a power control input of an amplifier in a transmitter portion of said transceiver;
detecting a power level of a transmit signal at an output of said transmitter and producing a transmit power level indicator corresponding to said power level of said transmit signal, wherein power level of said transmit signal is proportional to said predetermined voltage level of said control signal;
coupling said transmit signal to produce a coupled transmit signal;
receiving said coupled transmit signal by a receiver portion of said transceiver;
producing by said receiver a receive signal strength indicator corresponding to a power level of said coupled transmit signal;
and
comparing levels of said receive signal strength indicator, said transmit power level indicator and said predetermined voltage level of said control signal to determine a failure mode of said transceiver, wherein said failure modes include a failure of said receiver, said transmitter, and said receiver and transmitter.

4 more elements

Dependencies are inferred from the claim text.