RECEIVER SYSTEM AND METHOD FOR RECEIVER TESTING

摘要

A receiver system which may be implemented in an integrated circuit device and suitable for use in automotive radar systems such as collision avoidance systems, includes self test circuitry whereby a local oscillator test signal is generated by an on-board frequency multiplier and mixed in a down-conversion mixer with an RF test signal. The RF test signal is generated on the device by up-conversion of an externally generated low-frequency test signal with the local oscillator test signal. Baseband components may also be checked using test signals of suitable frequency divided down from the local oscillator test signal by a programmable frequency divider. This self test arrangement obviates any need for applying externally generated RF test signals to the IC device.

主权项

1. A receiver system comprising:
a down-conversion mixer; a frequency multiplier configured to generate a local oscillator test signal; a first coupler configured to couple the local oscillator test signal to a first input of the down-conversion mixer; an input port configured to receive a test signal; an up-conversion mixer configured to mix the received test signal with the local oscillator test signal to produce an RF test signal; a second coupler configured to couple the RF test signal to a second input of the down-conversion mixer; and an output port configured to receive a baseband signal from an output of the down-conversion mixer.