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CMOS Linear Mixer Design for High Performance Receiver Applications

CMOS Linear Mixer Design for High Performance Receiver Applications. Jiming Jiang 22 Sept 2005 Department of Engineering, University of Cambridge. Design Issue. Non-linearity Bandwidth Power Consumption Conversion Gain Noise. Process. 0.35um. 0.18um. 0.13um. 0.09um. IIP3.

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CMOS Linear Mixer Design for High Performance Receiver Applications

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  1. CMOS Linear Mixer Designfor High Performance Receiver Applications Jiming Jiang 22 Sept 2005 Department of Engineering, University of Cambridge

  2. Design Issue • Non-linearity • Bandwidth • Power Consumption • Conversion Gain • Noise

  3. Process 0.35um 0.18um 0.13um 0.09um IIP3 5-10dBm 5dBm 5dBm 0-5dBm Noise Figure 10-15dB 10dB 10dB 5-10dB Conversion Gain 0dB 0-5dB 0-5dB 5dB Radio Frequency 1.5GHz 2.5GHz 5GHz 10GHz Intermediate Frequency 300MHz 600MHz 1.2 GHz 2.5GHz Bandwidth 150MHz 400MHz 600MHz 1.2GHz Target Specification

  4. Non-linearity: Third Order Inter-modulation Distortion

  5. Analysis Methods for Prediction of Non-linearity • Taylor series • Simple approach but not adequate for high frequency analysis • Harmonic balance • Accurate but only suitable for numerical work, eg computer simulation • Volterra series • Accurate but complicated procedure demanded

  6. IMD3 using Volterra Series Common Source: Differential Pair:

  7. Discussions:Linearity improvement methods Discussion 1: Linearity Enhancement based on degeneration component Discussion 2:Linearity based on A1(s) and T1 Increasing A1(s) -> Linearity decrease Increasing T1 -> Linearity increase

  8. Linearity Enhancement With Capacitance and Degeneration Inductance With source and degeneration impedance With external capacitance and degeneration inductance

  9. Conclusion Inductive Capacitive Resistive Good Linearity Noisy resistance Good Linearity No noise Added Bad Linearity Noisy Source

  10. IIP3 With Swept Inductance and Capacitance Value NB: Simulation is based on AMS 0.35um BSIM3 Model

  11. Simulation Circuit Setup Capacitance degeneration Inductance degeneration

  12. Without Improvement (IIP3=10dbm)

  13. With Improvement (IIP3=23.5dBm)

  14. Proposed Linearity Enhancement method: Pre-Distortion

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