Patent ID: 11870451
Assignee: VIAVI SOLUTIONS INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A frequency synthesizer, comprising:
a mixer to mix a multiple of an input signal of the frequency synthesizer and a voltage-controlled oscillator (VCO) feedback signal;
an on-chip VCO bank implemented in an integrated circuit (IC) comprising a plurality of VCOs, wherein a VCO in the VCO bank is selected to provide a VCO signal with a VCO frequency based on a tuning voltage;
an off-chip phase-locked loop (PLL) external to the IC, the PLL to:
receive an output of the mixer and the input signal; and
generate the tuning voltage based on a phase comparison of the output of the mixer and the input signal; and

an output circuit comprising:
a first multiplexer to receive a direct output of the selected VCO from the VCO bank;
a doubler to provide a frequency doubled output of the selected VCO to the first multiplexer;
a channel divider to provide a frequency divided output of the selected VCO to the first multiplexer; and
at least one amplifier to amplify an output of the first multiplexer.