公开(公告)号：US20210391866A1

公开(公告)日：2021-12-16

申请号：US17128791

申请日：2020-12-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Srinivas THEERTHAM ,  Jagdish CHAND ,  Yogesh DARWHEKAR ,  Subhashish MUKHERJEE ,  Jayawardan JANARDHANAN ,  Uday Kiran MEDA ,  Arpan Sureshbhai THAKKAR ,  Apoorva BHATIA ,  Pranav KUMAR

IPC: H03L7/23 ,  H03L7/099 ,  H03L7/085 ,  H03M1/66

Abstract: A frequency synthesizer includes a phase-locked loop (PLL). The PLL includes a first voltage-controlled oscillator (VCO) and a second VCO, each comprising an oscillator, a capacitor bank, and a bias circuit. The capacitor bank is configured to selectably adjust an output frequency of the oscillator. The bias circuit is configured to provide a bias current to the oscillator, and includes a current digital-to-analog converter (IDAC), and an amplifier coupled to the IDAC and configured to drive the oscillator.