Modeling linear periodically time-varying (LPTV) circuits is challenging due to the presence of frequency translation. Many approaches have been proposed that simplify the analysis and provide intuition into the operation of these circuits. It is critical to select the proper model when designing LPTV systems: too complex, and intuition is lost; too simple, and numerical accuracy degrades. This work shows how a conversion matrix-based model can be used for mixer-first receivers with complex feedback in the presence of finite switch transitions. This model accurately predicts S11 below -10 dB for all tested transition times, in contrast with prior models, which are shown to be invalid with transitions beyond 2% of the clock period. As a design tool, this approach models gain, harmonic rejection ratio, and noise figure within 0.1 dB of simulation with switch transitions even at 5% of the clock period.
|Title of host publication||2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Publication status||Published - 2020|
|Event||52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Virtual, Online|
Duration: 2020 Oct 10 → 2020 Oct 21
|Name||Proceedings - IEEE International Symposium on Circuits and Systems|
|Conference||52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020|
|Period||20/10/10 → 20/10/21|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT This work was supported in part by Globalfoundries via the Stanford SystemX Fellow Mentor Advisor (FMA) program.
© 2020 IEEE
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering