RF CMOS Oscillators

The following sections are included:

• Introduction

  • Ring Oscillator

  • LC Oscillator

• Various LC VCO Topologies

  • Colpitts and Hartley LC VCOs

  • Differential LC VCOs

    • Complementary LC VCOs

    • Tail current source of LC VCOs

• LC VCO Design Methodology

  • Topology

    • Operation theory

    • Equivalent circuit of cross-coupled LC tank VCO

  • Associated Noise Sources of Complementary LC Tank VCO

    • Noise sources of the LC tank

    • Upconversion of 1/f noise in the tail transistor

  • Noise Sources in Active Devices

    • High frequency noise

    • Noise sources in cross-coupled transistors

    • Optimization of channel length L_ch

  • Linear Time Variant (LTV) Phase Noise Analysis

    • Definition of Impulse Sensitivity Function (ISF) −Γ(ω₀t)

    • Parameterized phase impulse response h_Φ(t, τ) using ISF

    • Phase noise calculation

    • Steps to achieve minimal phase noise

  • A 2GHz Cross-Coupled LC Tank VCO

    • 2GHz cross-coupled LC tank VCO

    • Verifications and discussions

    • Experimental results

  • A 9.3 ˜ 10.4GHz Cross-Coupled Complementary Oscillator

    • Phase noise estimation for 10GHz LC tank VCO

    • Experimental results

• Summary

• References