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22-29GHz Ultra-Wideband CMOS

Pulse Generator for Collision

Avoidance Short Range Vehicular

Radar Sensors

Ahmet Oncu, B.B.M. WasanthamalaBadalawa, Tong Wang and Minoru FUJISHIMA

School of Frontier SciencesThe University of Tokyo

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Introduction

A few cm resolution

At least 5GHz Bandwidth

Low power Low cost

360o pre-crash detection

Collision warning

Blind spot detection

Intersection alerts

Automatic cruse control

Park aid..

Short range radar sensor system

covering 360o

Radar

CCU

Front

Back

Rights

ide

Lefts

ide

Radar

sensor

Central

control unit

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Proposed CMOS SR radar sensor

Conventional transmitterfor SR pulse radar sensor

Proposed CMOS SR pulseradar sensor

CWinput

TX

pulse trainrectangular

envelope

DSP

CMOS

pulse width control

Many discrete componentsmmWave CW oscillator ON

High power consumption

Less discrete componentsNo mmWave CW oscillator

Low power consumption

TX

RX

DSP

This

workobject

PN data

Pulse

Receiver

PRC envelope

CMOS

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Pulse generator block diagram

Delay Cell

D D D D D

D

Edge Combiner

Input

Output

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Time domain measurement

39.2ps

VRFpp=71mV

VRFpp=120mV

Subtracting connection

loss (4.6dB)

PRFpeak=-19dBm

FCC specification

Pout= 41.3dBm/MHz

Pinst= 0dBm

Required PA gain

G= 14 ~ 19dB

552ps

71mV

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Chip summary

Technology 90nm CMOS

Band 22-29GHz

Modulation OOKSupply

Voltage0.91V

Max Data Rate 1 Gbps

Power

Consumption 1.4 mW

Core Size 90m 15m

Core

Chip summary

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Conclusion

Pseudo mmWave UWB CMOS pulse generator forshort range automotive radar application isdemonstrated.

Up to 1Gbps input data rate, 7GHz wide and 552psshot pulses with -14dBm output power are generated.

3.19 mW static power dissipation and 1.4pJ/bit whichis 100 times less than reported pulse generators.

With its simple structure it will open up newapplication for short range collision avoidanceautomotive radars with low power consumption andlow cost.