Title :
A compact modulator circuit with high current protection for low chirp pulsed IMPATT oscillator
Author :
Bhanja, Sukhendu ; Sarkar, Mousumi ; Majumdar, Arijit ; Ghoshal, Tanmay
Author_Institution :
Circuits & Syst. Div., SAMEER, Kolkata, India
Abstract :
A compact pulsed modulator circuit is presented which can drive pulsed IMPATT diode at Ka band with peak current of 18A and duty ratio of 0.04%. A TTL pulse generator circuit using solid state delay is developed for driving the bias circuit which has a good temperature stability. A protection circuit is also incorporated to prevent burn-out of the diode at high current. A Ka band pulsed IMPATT oscillator is designed and developed using the pulse modulator. Very low chirp is obtained using constant current source and varying the slope of the bias current pulse. A peak power of 12W has been realized with a chirp bandwidth of 150 MHz.
Keywords :
IMPATT oscillators; circuit stability; modulators; pulse generators; pulse modulation; transistor-transistor logic; Ka band pulsed IMPATT oscillator; TTL pulse generator circuit; bandwidth 150 MHz; bias circuit; bias current pulse slope; compact pulsed modulator circuit; constant current source; duty ratio; high current protection; low chirp pulsed IMPATT oscillator; protection circuit; pulsed IMPATT diode; solid state delay; temperature stability; Bandwidth; Chirp; Frequency modulation; Oscillators; Pulse generation; Radio frequency; Protection circuit; Pulse IMPATT diode; Pulse modulator; TTL pulse generator;
Conference_Titel :
Applied Electromagnetics Conference (AEMC), 2013 IEEE
Conference_Location :
Bhubaneswar
Print_ISBN :
978-1-4799-3266-5
DOI :
10.1109/AEMC.2013.7045074
