LH01a-22 Design Of Radio Frequency Integrated Circuits

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ZHENG, Zheyang
January 18, 2023 2:22 pm
  1. What are the targeted applications of the transmitter and mixer you designed? e.g., conventional mobile phones or others? Why millimeter wave is needed?
  2. What are the reasons for using Class-F PA?
  3. Is the loss of the mixer too large? (-11.67 dB) What’s the definition and what are the state-of-the-art values?
  4. Figures in the right column are difficult to read.
XING, Hexiang
January 18, 2023 2:38 pm
Reply to  ZHENG, Zheyang

Dear professor,
The targeted applications is for high-order QAM modulation siganl in 5G mobile communication. The frequency band for 5G is around 28GHz.
Class-F topology is used for enhancing the power efficiency.

CAI, Yuxiang
January 18, 2023 2:50 pm
Reply to  ZHENG, Zheyang

Dear Prof ZHENG:

I am the designer of the mixer part and let me answer some parts as much as I can.

This mixer has been improved now so that its gain can achieve +1.825dB. The loss of mixer is too large previously because the input signal setting is fault. The power is too large so that the circuit loses its small signal properties. This are all fixed currently.

The definition of gain is setting IF signal as input and RF port differential signal as output. Concerning state of art values, it should be around or higher than 5dB. While the inductance matching to the parasitic capacitor can be further improved, the gain has possibility to increase. However, since the next stage is a PA, high gain is not the main concernof the design of the mixer. The integrity of signal of the latest version achieve a reasonable perform through Cadence.

And sorry for the difficulty in viewing the figure because the Cadence’s interface is not so clear. We will process the figure before submittion next time.