RING OSCILLATOR CONTAINING TWO RINGS HAVING COMBINED OUTPUT

PROBLEM TO BE SOLVED: To drive the gate of a PMOS transistor TR having a slower response earlier than the gate of an NMOS TR and to operate a ring oscillator with a higher oscillation frequency by using the differential amplifiers of a P and an N type inputs to plural cascaded inverters. SOLUTION: A...

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Bibliographic Details
Main Authors VU HOAI X, VU TOAN
Format Patent
LanguageEnglish
Published 22.05.1998
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PULSE TECHNIQUE
TRANSMISSION
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Summary:PROBLEM TO BE SOLVED: To drive the gate of a PMOS transistor TR having a slower response earlier than the gate of an NMOS TR and to operate a ring oscillator with a higher oscillation frequency by using the differential amplifiers of a P and an N type inputs to plural cascaded inverters. SOLUTION: A PMOS TR 304' is not connected as an inverter and shares an NMOS TR that is contained in an inverter 3005 . An interpolation circuit 306' includes a pair of FET TR 305' and 307' whose drains age connected to the sources of a PMOS TR of the inverter 3005 and the TR 304' respectively. The delay is changed in two rings by the slow TR 304' and a fast NMOS TR included in the inverter 3005 . The circuit 306' mixes the inputs according to the control voltage which are applied to both TR 305' and 307' and changes the oscillation frequency of the VCO(voltage controlled oscillator) 38' and 76'.
Bibliography:Application Number: JP19970100731