1. Lab9: ADS Ptolemy-Circuit Co-Simulations
Day 3
Lab9: ADS Ptolemy-Circuit Co-Simulations

2. Theme Day 1- Background Preparation
Maxwell Equations-Physical Interpretation & Application
Interconnects- Design, Mismatch, & Insertion Losses
GaAs Process- Pseudomorphic HEMTs, Inductors & MIM Capacitors
Process Introduction
Day 2- Power Amplifier, MMIC Design Example
DC Characterization- Biasing Decoupling, Biasing Techniques, Thermal Stability
Small Signal Characterization- Matching & Stability
Large Signal Characterization- Single Tone Analysis, Matching across Power
Load Pull
Day 3- Design Refining, Layout & Design Post Processing
Modulated Signal- QAM16 Input, Ptolemy & Circuit Co-simulations
Linearity- Two Tone Analysis, IP3, ACPR, & EVM
On-chip Power Combiners & Dividers
Layout & Tiling

3. QAM16 Modulation
Each State, designated unique phase and amplitude, represents 4 bit symbol
Acceptable State with Amplitude and Phase Error I Q I Q
Bin
Sampling
I Signal
Filtered I Signal
Ideal QAM 16 Constellation

4. PA Linearity & Signal Integrity
Pout (dBm)
Gain (dB)
Phase t
I (t)
Q (t)
Modulates Sine Carrier
Modulates Cosine Carrier
QAM16 Constellation
Filtered I & Q Signals
Sine & Cosine Components of RF Carrier are modulated by I and Q Signals. Output of IQ Modulator is input to PA
PA Transfer Characteristics
Demodulated PA Output

5. QAM16 Source TkPlot DSP Filters TkPlot IQ Modulator Random Data Bits
I & Q bit stream

6. PA Circuit for Ptolemy-Circuit Co-Simulations
Symbol for PA Sub-Circuit
PA Sub-Circuit

7. Envelope Simulation Setup

8. Ptolemy Bench for Ptolemy-Circuit Co-Simulation

9. PA Performance Output Constellation from Compressed PA
Skewed Constellation
Output Constellation from Uncompressed PA

10. Lab9: ADS Ptolemy-Circuit Co-Simulations
Start Lab Exercise!