Patent ID: 7265598
Filing Date: 2007-09-04
Classification: H03K

Abstract:
1. A circuitry for generating a narrow impulse, for use in Ultra Wide Band (UWB) radar transmission, comprising: an input device coupled to a matching circuitry that is coupled to a step recovery diode (SRD); said input device comprising first and second switching transistors, at least said second transistor having a control electrode and each of said transistors being DC coupled to said SRD, and said input device being configured to receive a succession of digital input signals, each characterized by having high level and low level portions, the signals having less than 50% duty cycle; said input device further being configured to charge said SRD through said first transistor and to discharge said SRD through said second transistor for a short period of time by AC coupling said control electrode of said second transistor to an inverted digital input signal, said input device being configured to drive forward said SRD through the matching circuitry during the high level portion of said digital signal, whereby said SRD stores sufficient charge for generating said narrow impulse substantially following the falling edge of the high level portion of said digital input signal.