Abstract
A 24-GHz direct-conversion transmitter is proposed for in-cabin radar applications. The proposed RF transmitter consists of an I/Q up-conversion mixer, an I/Q local (LO) oscillator generator, and a power amplifier. To improve the linearity of the I/Q up-conversion mixer, an inverter transconductor with third-order intermodulation (IM3) distortion cancellation is proposed. To improve the I/Q balancing performance of the I/Q LO generator, a poly-phase filter, including parasitic line inductance, is proposed. By employing a highly linear I/Q up-conversion mixer and a balanced I/Q LO generator, the 24-GHz direct-conversion transmitter achieves high linearity and I/Q balancing characteristics. It is fabricated in a 65-nm CMOS process and consumes 150 mW. It shows an OP1dB of 8.6 dBm, an LO leakage of −48 dBc, and an image rejection ratio of −49 dBc for the entire operating band from 24 GHz to 24.5 GHz.
Highlights
Many dangerous accidents occur when there are sudden changes in a person’s physical condition
The presented 24-GHz CMOS transmitter short-range monitoring systems in a vehicle because it does not require a wide range of gain control consists of an I(in-phase)/Q(quadrature-phase) up-conversion mixer, an I/Q LO generator, and a and can alleviate the problem of carrier leakage [7,8]
The highest OIP3 performance of the channel length of 65 nm isp1approximately 70 μm, which is slightly different from the optimum width up-conversion mixer is achieved when the width of PMOS MP1 with a channel length of 65 nm is of 60 μm of the inverter PMOS transistor from the small signal input voltage output current analysis approximately 70 μm, which is slightly different from the optimum width of 60 μm of the inverter PMOS
Summary
Many dangerous accidents occur when there are sudden changes in a person’s physical condition. To measure a driver’s respiration and heart rate without contact devices, many short-range radar systems have been implemented in various frequency bands from 0.9 GHz to 60 GHz. Most of the previous radar systems have been implemented in a continuous-wave (CW) Doppler radar system architecture because they can realize a very simple fully integrated RF transceiver. GHz to GHz is used to the previous CW Doppler radar transmitter structure, a 24-GHz direct-conversion transmitter with a obtain more accurate measurements respirationI/Q andlocal heartoscillator rate at the same time, even there is for highly linear up-conversion mixer andof a balanced (LO). For the transmitter architecture suitable for the new OFDM approach, unlike the in-cabin radar applications It is designed and fabricated in a 65-nm RF CMOS process and provides previous CW Doppler radar transmitter structure, a 24-GHz direct-conversion transmitter with a highly high linearity and I/Q balancing characteristics.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
