RF microwave circuit and pulse shaping method
A multi-port circuit and corresponding method for simultaneous shaping of sub-nanosecond pulses (MCS 3 P). The MCS 3 P includes a coupled-line coupler, a Schottky detector diode, and circuitry for compressing the rising and falling edges of a waveform. The MCS 3 P simultaneously produces square wave, Gaussian, and monocycle waveforms by differentiating a sinusoidal source. The method includes the steps of compressing the rising edge of a sinusoidal source waveform, differentiating the resulting waveform to form a square waveform and a Gaussian waveform, filtering out the positive going Gaussian to produce a negative going Gaussian, differentiating the Gaussian waveform to form a monocycle waveform, and compressing the falling edge of the square waveform to produce a square wave form with both edges compressed.
1. A multi-port pulse shaping circuit, comprising:
an input port adapted to receive an input periodic waveform pulse;
a first transmission line connected to the input port to form and transmit a square wave pulse from the input pulse;
a second transmission line and a third transmission line positioned in a parallel coupled-line structure to the first transmission line to differentiate the square wave pulse to form bipolar Gaussian pulses;
a first output port connected to the first transmission line to output the square wave pulse;
a clamping and filter circuit coupled to the second transmission line to clamp a positive amplitude bipolar Gaussian pulse and pass a negative amplitude bipolar Gaussian pulse;
a second output port connected to the clamping and filter circuit to selectively output the negative amplitude bipolar Gaussian pulse;
a Schottky detector differentiator connected to the third transmission line to differentiate the Gaussian pulse to form a monocycle pulse; and
a third output port connected to the Schottky detector differentiator to output the monocycle pulse.
2. The multi-port pulse shaping circuit of claim 1 , further comprising:
a circuitry connected to the input port and the first transmission line to compress a rising edge of an input pulse; and
a circuitry connected to the first transmission line and the first output port to compress the falling edge of the square wave pulse.
3. The multi-port pulse shaping circuit of claim 1 , wherein the circuitry to compress the rising edge of an input pulse is a step-recovery diode.
4. The multi-port pulse shaping circuit of claim 1 , wherein the circuitry to compress the falling edge of the square wave pulse is a step-recovery diode.
5. The multi-port pulse shaping circuit of claim 1 , wherein the input pulse is a sinusoidal pulse.
6. The multi-port pulse shaping circuit of claim 1 , wherein the second output port selectively outputs the negative amplitude bipolar Gaussian pulse.