SmartSpice RF Harmonic Balance Based and Shooting Method Based RF Simulation

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1 SmartSpice RF Harmonic Balance Based and Shooting Method Based RF Simulation

2 Silvaco Overview SSRF Attributes Harmonic balance approach to solve system of equations in frequency domain Well suited for RF and Microwave Circuits as they are naturally handled in frequency domain Time domain shooting method to determine steady state response Shooting method can be preferable to HB for the strongly nonlinear circuits, consist mostly of time-dependent elements - 2 -

3 Silvaco Fills the Gap Linear Nonlinearity Digital Microwave 4 5 GHz Harmonic Balance Increasing Frequency RF 500MHz 5GHz Conventional Analog III-V Material Silvaco SmartSpice Shooting Method CMOS Bipolar BiCMOS Oscillators, mixers, samplers, - 3 -

4 Silvaco Inputs/Outputs - 4 -

5 Silvaco RF Design Flow with RF PDK - 5 -

6 Silvaco Analysis SmartSpice RF incorporates the following analyses:.harmonic Periodic Steady State Analysis.HAC Periodic Steady State AC Analysis.HTF Periodic Steady State Transfer Function Analysis.HNET Periodic Steady State NET Analysis.HNOISE Periodic Steady State Noise Analysis.HOSCIL Periodic Steady State Analysis for autonomous circuits oscillators.spectral Quasi- Periodic Steady State Analysis.SPAC Quasi- Periodic Steady State AC Analysis.SPTF Quasi- Periodic Steady State Transfer Function Analysis.SPNET Quasi- Periodic Steady State NET Analysis.SPNOISE Quasi- Periodic Steady State Noise Analysis.ENV Circuit Envelope Analysis - 6 -

7 .HARMONIC (Periodic Steady State Analysis) Harmonic Balance Method Frequency-domain non-linear simulation techniques Shooting Method Transient analysis with periodicity constraint v(0) = v(t) Optimal convergence for simulation Provides a complete set of interactive control parameters Spectral-Newton, Continuation, and GMRES solvers Parameter Sweep Power or Frequency Sweep Computes 1db Compression Point (P1dB), 3rd Order Intercept Point (IP3) Monte-Carlo Analysis Embedded in each Silvaco analysis Unique ability for statistical distribution of gain, power, etc

8 Silvaco Small Signal Analyses.HTF Periodic Steady State Transfer Function Analysis Transfer functions from any input to a single output Any input from any image Applications: Conversion gain, image and sideband rejection, power supply rejection.hac Periodic Steady State AC Analysis Transfer functions from a single input to any output Any output at any sideband Applications: Conversion gain, intermodulation distortion.hnoise Periodic Steady State Noise Analysis Applications: Noise figure of mixers, phase noise of oscillators, noise of SC-filters & sample-and-holds - 8 -

9 Silvaco Small Signal Analyses.HNET Periodic Steady State NET Analysis Computes s-parameters for 2-port circuits that exhibit frequency translation 2-port linear noise option Capability to plot Rectangular Chart, Smith Chart, Noise/Gain/Stability circles. Useful for impedance matching, tuning, and optimization - 9 -

10 .HTF (Periodic Steady State Transfer Function Analysis) Single output, multiple input frequencies Conversion gain Image and sideband rejection Supply rejection LO feed-through Input Output LO Sideband index is relative to output frequency

11 .HAC (Periodic Steady State AC Analysis) Single input, multiple output frequencies Frequency response Conversion efficiency Intermodulation distortion Input Output LO Sideband index is relative to input frequency

12 .HNOISE (Periodic Steady State Noise Analysis) Noise is replicated and translated by LO Mixers and Samplers Oscillators Switched Capacitor Filters Noise Output LO

13 .SPECTRAL (Quasi-Periodic Steady State Analysis).SPECTRAL Analysis can simulate the circuit with multi-tone excitations, all of them treated as large signal analysis Time domain and frequency domain waveforms are directly computed. Time domain output is useful to check distortions and clipping Output includes intermodulation distortion caused by frequency translation of harmonics from all input signal

14 Highlights on Silvaco Examples Lab 1: RF Mixer Design and Analysis 1 db Compression Point 3rd Order Intercept Point Conversion Gain Response Noise Figure Lab 2: RF LNA Design and Analysis S-Parameter Extraction Gain and Stability Circles Lab 3: RF VCO Design and Analysis Transient Simulation Frequency of Oscillation Extraction Phase Noise Spectrum

15 Lab1: Mixer Simulation- 1 db Compression Point.HARMONIC used to compute P1dB LO 1G RF 920MHz Prf -20dBm to 0dBm Prf Power level of RF Source. HARMONIC 1 large tone in LO+ 1 large tone in RF

16 Lab1: Mixer Simulation- 1 db Compression Point 1dB Compression point is - 6 dbm

17 Lab1: Mixer Simulation- 3rd Order Intercept Point.HAC used to compute IP3 LO: 1G RF1: 920MHz, RF2: 921MHz prf: -24dBm to -2dBm prf: Power Level of RF Source HAC: LO plus 1 large tone (RF1) + 1 small tone (RF2) 1st order harmonic: 79MHz 3rd order harmonic: 81MHz

18 Lab1: Mixer Simulation- 3rd Order Intercept Point 3rd Order Intercept point is 12.3 dbm

19 Lab1: Mixer Simulation- Conversion Gain.HTF used to compute Conversion Gain LO: 1G RF: 920MHz Terminate prf with 50 ohm. SB(-1,1) is mixing PIF

20 Lab1: Mixer Simulation- Conversion Gain The Conversion Gain is around MHz

21 Lab1: Mixer Simulation- Noise Figure.HNOISE used to compute Noise Figure LO: 1G RF: 920MHz Terminate prf with 50 ohm. refsb= -1is the single sideband noise PIF

22 Lab1: Mixer Simulation- Noise Figure The Noise Figure is around MHz

23 Lab2: LNA Simulation- S Parameter.HNET used to compute S Parameter RF: 900MHz Frequency sweep from 100MHz to 1.2GHz

24 Lab2: LNA Simulation- S Parameter S11, S22, and S21 in Cartesian Chart S11in Smith Chart

25 Lab2: LNA Simulation- Gain and Stability Circles Specify LOAD_STAB_CIRCLES, SOURCE_STAB_CIRCLES, GAIN_CIRCLES, and POWER_GAIN_CIRCLES in.hnet to compute these parameters RF: 900MHz Frequency sweep from 800MHz to 1.0GHz

26 Lab3: VCO Simulation- Transient Analysis.TRAN used to compute transient behavior and determine oscillation frequency

27 Lab3: VCO Simulation- Transient Analysis Time domain signal is transformed into frequency domain by FFT Oscillation frequency is around 1.86GHz

28 Lab3: VCO Simulation- Phase Noise Analysis.HNOISE used to compute phase noise behavior Frequency sweep for single sideband from 1Hz to 10MHz

29 Lab3: VCO Simulation- Phase Noise Analysis Phase Noise is around -54 1KHz, and 84 1MHz

30 Conclusion SmartSpice RF is applicable to periodically driven circuits Exhibits frequency conversion such as mixers, amplifiers, oscillators, filters, and detectors Simulation run time is insensitive to the excitation frequencies (Harmonic Balance Method) Converges easily on strong non-linear circuits (Shooting Method) Integrated with Silvaco front-to-back Mixed Signal/RF design flow