Multi-mode transmit and receive PLL
AssigneeBroadcom Corporation
InventorsSofoklis E. Plevridis, Konstantinos D. Vavelidis, Theodoros Georgantas, Ilias A. Bouras
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Abstract
A local oscillator (LO) signal generator that has a reference phase-locked loop (PLL), a receiver LO PLL and a transmitter LO PLL. A reference PLL is coupled to receive a reference clock input and to generate a reference PLL signal at its output, which then drives a receiver PLL and a transmitter PLL. The receiver PLL is coupled to receive the reference PLL signal and to use the reference PLL signal as its reference input to generate a receiver LO signal at its output. The transmitter PLL is coupled to receive the reference PLL signal and to use the reference PLL signal as its reference input to generate a transmitter LO signal at its output.
Claims17
An apparatus comprising:
- a first phase-locked loop (PLL) coupled to receive a reference input and to generate a reference PLL signal at its output;
- a second PLL coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate a receiver local oscillator (LO) signal at its output;
- and
- a third PLL coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate a transmitter LO signal at its output, the transmitter LO signal being generated separate from the receiver LO signal and the two LO signals being not dependent on each other.
An apparatus comprising:
- an radio frequency (RF) front end including a receiver to receive an inbound signal and a transmitter to transmit an outbound signal, wherein the receiver includes at least one receiver mixing module to mix the inbound signal with a receiver local oscillator (RX LO) signal and s wherein the transmitter includes at least one transmitter mixing module to mix the outbound signal with a transmitter local oscillator (TX LO) signal;
- a local oscillator coupled to the receiver and the transmitter in which the local oscillator includes:
- (a) a first phase-locked loop (PLL) that is coupled to receive a reference input and to generate a reference PLL signal at its output;
- (b) a second PLL coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate the RX LO signal at its output;
- and
- (c) a third PLL coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate the TX LO signal at its output, the TX LO signal being generated separate from the RX LO signal and the two LO signals being not dependent on each other.
A method comprising:
- generating a reference PLL signal at an output of a first phase-locked loop (PLL) that is coupled to receive a reference input;
- generating a receiver local oscillator (LO) signal at an output of a second PLL that is coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate the receiver LO signal;
- and
- generating a transmitter LO signal at an output of a third PLL that is coupled to receive the reference PLL signal from the first PLL and to use the reference PLL signal as its reference input to generate the transmitter LO signal, the transmitter LO signal being generated separate from the receiver LO signal and the two LO signals being not dependent on each other.
Dependencies are inferred from the claim text.