Abstract: An isolation system includes a transmit die and a receive die coupled by an isolation channel. The transmit die receives diagnostic data at an input terminal and transmits the diagnostic data over an isolation channel to a receive die. The receive die supplies a signal from an internal node in the receive die identified by the diagnostic data to an output terminal of the receive die. Other diagnostic data received by the transmit die causes the transmit die to supply a signal from an internal node in the transmit die to a terminal of the transmit die.

Abstract: In some embodiments, powered devices, circuits, and methods are disclosed that may include biasing a hot swap switch to couple a capacitor of a DC-DC converter to negative supply node when an input voltage exceeds a threshold and biasing a telephony switch to couple a positive supply node to a negative supply node when the input voltage exceeds the threshold. Further, the method may further include deactivating the hot swap switch after a period of time, and continuing to bias the telephony switch.

Abstract: In some embodiments, powered devices, circuits, and methods are disclosed that may include biasing a hot swap switch to couple a capacitor of a DC-DC converter to negative supply node when an input voltage exceeds a threshold and biasing a telephony switch to couple a positive supply node to a negative supply node when the input voltage exceeds the threshold. Further, the method may further include deactivating the hot swap switch after a period of time, and continuing to bias the telephony switch.

Abstract: In some embodiments, a powered device includes a powered device circuit, which may include a maintain power signature (MPS) circuit configured to compare a sense current to a reference current. In a first mode, the MPS circuit may be configured to automatically generate an MPS signal when the sense current is less than the reference current.

Abstract: An RF receiver includes an RF signal reception path to process an input signal for the receiver for a first mode of the receiver; an oscillator; and a harmonic generator. The harmonic generator generates a harmonic signal in response to operation of the oscillator to replace the input signal with the harmonic signal for a second mode of the receiver.

Abstract: In one embodiment, the present invention includes a mixer having various stages, including a transconductance stage with a differential transistor pair, a bias circuit, and a feedback circuit. The transistor pair can include a first transistor having a first terminal to receive a first input radio frequency (RF) voltage and to output a first RF current via a second terminal of the first transistor, and a second transistor having a first terminal to receive a second input RF voltage and to output a second RF current via a second terminal of the second transistor. In turn, the bias circuit is coupled to the second terminals of the transistors to provide a bias current to these transistors. The feedback circuit is in turn coupled to the second terminals of the transistors to generate a feedback signal corresponding to a common mode voltage at the second terminals of the transistors.

Abstract: An integrated circuit (IC) having a radio receiver configured to perform a jitter self-test is disclosed. In one embodiment, an IC includes a radio receiver and a pulse generator. The pulse generator is configured to generate a pulse train based on a first periodic signal received from the radio receiver. The radio receiver is configured to use the pulse train to determine an amount of phase noise generated by a local oscillator of the radio receiver. The pulse generator and the radio receiver are implemented on the same IC die.

Abstract: An integrated circuit (IC) having a radio receiver configured to perform a jitter self-test is disclosed. In one embodiment, an IC includes a radio receiver and a pulse generator. The pulse generator is configured to generate a pulse train based on a first periodic signal received from the radio receiver. The radio receiver is configured to use the pulse train to determine an amount of phase noise generated by a local oscillator of the radio receiver. The pulse generator and the radio receiver are implemented on the same IC die.

Abstract: An RF receiver includes an RF signal reception path to process an input signal for the receiver for a first mode of the receiver; an oscillator; and a harmonic generator. The harmonic generator generates a harmonic signal in response to operation of the oscillator to replace the input signal with the harmonic signal for a second mode of the receiver.

Abstract: In one embodiment, the present invention includes a mixer having various stages, including a transconductance stage with a differential transistor pair, a bias circuit, and a feedback circuit. The transistor pair can include a first transistor having a first terminal to receive a first input radio frequency (RF) voltage and to output a first RF current via a second terminal of the first transistor, and a second transistor having a first terminal to receive a second input RF voltage and to output a second RF current via a second terminal of the second transistor. In turn, the bias circuit is coupled to the second terminals of the transistors to provide a bias current to these transistors. The feedback circuit is in turn coupled to the second terminals of the transistors to generate a feedback signal corresponding to a common mode voltage at the second terminals of the transistors.