Radio frequency transceiver loopback testing
First Claim
1. An integrated circuit comprising:
- a receiver portion comprising;
a first receiver input to receive a radio frequency (RF) signal;
a second receiver input to receive an output signal from a phase locked loop; and
a mixer coupled to the first receiver input and to the second receiver input;
a transmitter portion to transmit an RF signal at a transmitter output of the transmitter portion and to receive a modulated PLL signal at a transmitter input of the transmitter portion;
the 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 the modulated PLL signal based on a transmitter modulation signal; and
wherein, during a test mode, the transmitter output and the first receiver input are coupled together in a loopback configuration, and the modulated PLL signal is provided to both the first receiver input and to the second receiver input.
11 Assignments
0 Petitions
Accused Products
Abstract
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.
-
Citations
20 Claims
-
1. An integrated circuit comprising:
-
a receiver portion comprising; a first receiver input to receive a radio frequency (RF) signal; a second receiver input to receive an output signal from a phase locked loop; and a mixer coupled to the first receiver input and to the second receiver input; a transmitter portion to transmit an RF signal at a transmitter output of the transmitter portion and to receive a modulated PLL signal at a transmitter input of the transmitter portion; the 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 the modulated PLL signal based on a transmitter modulation signal; and wherein, during a test mode, the transmitter output and the first receiver input are coupled together in a loopback configuration, and the modulated PLL signal is provided to both the first receiver input and to the second receiver input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of testing an integrated circuit comprising:
-
coupling a receiver portion of a radio frequency (RF) transceiver at a first receiver input to a transmitter portion of the transceiver at a transmitter output in a loopback configuration during a test mode; providing a phase locked loop (PLL) output signal to the transmitter portion and to a second receiver input of the receiver portion, the PLL output signal during normal operation being used by the transmitter portion during a transmit mode and being used by the receiver portion during a receive mode; generating the PLL output signal based on a transmitter modulation signal received at the PLL during the test mode; receiving at the first receiver input a signal output from the transmitter portion; receiving at the second receiver input the PLL output signal; performing a mixing function, in the receiver portion, the function having inputs including a signal received at the first receiver input receiver input and a signal received at the second receiver input; and determining a test result based on an output of the mixing function. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of testing a radio frequency (RF) transceiver comprising:
-
during a test mode; providing a RF transceiver having a first receiver portion input coupled to a transmitter portion output in a loopback configuration; performing a loopback test during which a phase locked loop (PLL) output is coupled to a second receiver portion input and to the transmitter portion, the PLL providing at the output a modulated PLL signal based on a transmitter modulation signal; and mixing a signal received at the first receiver input portion with a signal received at the second receiver portion input; during normal operation; coupling the PLL output to the transmitter portion during a transmit mode; and coupling the PLL output to the receiver portion during a receive mode. - View Dependent Claims (20)
-
Specification