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A tunable distributed voltage controlled oscillator for generating high frequency microwave signals

 

A tunable distributed voltage controlled oscillator for generating high frequency microwave signals. The oscillator  comprises a plurality of stages of complimentary metal oxide semiconductor (CMOS) inverters in parallel configuration. Each of the inverters comprises a p-metal oxide semiconductor field effect transistor (MOSFET)  at the top and a n-metal oxide semiconductor field effect transistor (MOSFET)  at the bottom with their gates connected to a supply voltage  and to a gate transmission line and their drains connected to the supply voltage and to a drain transmission  line . The drain transmission line and the gate transmission line are connected to each other through a feed back path . The drain transmission line and the gate transmission line each comprises a plurality of coplanar wave guides in series respectively.  The number of coplanar wave guide in each of the gate and drain transmission lines is greater than the number of stages of  CMOS inverters by a factor of 1. The body  of the p-MOSFET is inwardly directed and connected to a forward body bias voltage  and the source of the p-MOSFET is connected to the supply voltage.  The body  of the n-MOSFET is  outwardly directed and the body and source  of the n-MOSFET are earthed. The gate transmission line further comprises a frequency collector .

Indian patent application no. 81/MUM/2010

Inventors: Kalyan Bhattacharya