UA89370U - Device for the determination of carrier life time in semiconductors - Google Patents

Abstract

A device for the determination of carrier life time comprises a twin pulse generator comprising of first and second square-pulse generators, delay circuit, and pulse clipper connected to first and second square-pulse generators and delay circuit which is series-connected to first square-pulse generator. Second square-pulse generator is parallel connected to first square-pulse generator and delay circuit. The device comprises a signal processing and indication unit, microelectronic frequency transducer comprising first, second and third resistors , first and second field-effect transistors, bipolar transistor, first and second capacitors and DC voltage source. First pole of DC voltage source is connected to first capacitor terminal, second terminal of third resistor and collector of bipolar transistor which base is connected to first terminal of third resistor and second terminal of first capacitor which first terminal is connected to bipolar transistor emitter, drain of first field-effect transistor, first and second gates of second field-effect transistor, first output terminal of the device and first terminal of first resistor, which second terminal is connected to first terminal of second resistor, sources of first and second field-effect transistors and second device terminal. Second terminal of second resistor is connected to drain of second field-effect transistor, first and second gates of first field-effect transistor, second terminal of second capacitor, second pole of DC voltage source, and signal processing and indication unit is connected to the device output terminals.