RADIO FREQUENCY TRANSCEIVER LOOPBACK TESTING

摘要

An integrated circuit includes a receiver portion, a transmitter portion, and a modulated phase locked loop. The receiver portion is for receiving a radio frequency (RF) signal at a receiver input of the receiver portion. The transmitter portion is for transmitting an RF signal at a transmitter output of the transmitter portion. The modulated phase locked loop (PLL) is shared between the receiver portion and the transmitter portion. The transmitter output and receiver input are coupled together in a loopback configuration during a test mode. The transmitter portion and the receiver portion are enabled concurrently while a modulated PLL signal is provided to the receiver portion from the transmitter portion via the loopback configuration.

主权项

1. An integrated circuit comprising:
a receiver portion for receiving a radio frequency (RF) signal at a receiver input of the receiver portion; a transmitter portion for transmitting an RF signal at a transmitter output of the transmitter portion; a phase locked loop (PLL) shared between the receiver portion and the transmitter portion, the PLL during normal operation being used by the transmitter portion during a transmit mode and being used by the receiver portion during a receive mode, and the PLL providing at an output a modulated PLL signal based on a transmitter modulation signal; and wherein the transmitter output and receiver input are coupled together in a loopback configuration during a test mode.