Patent ID: 8156167

Claim:
A pseudo random bit sequence (PRBS) generator comprising: an exclusive OR (EXOR) circuit having an output providing an output of the PRBS generator: a first delay line having an input connected to an output of the EXOR circuit, and an output connected to a first input of the EXOR circuit; and a second delay line having an input connected to an output of the EXOR circuit, and an output connected to a second input of the EXOR circuit; wherein the EXOR circuit comprises: a mixer having a LO input connected to the output of the first delay line, an RF input connected to the output of the second delay line, and an IF output; and an amplifier having an input connected to the IF output of the mixer and an output providing the output of the EXOR circuit; and wherein the mixer of the EXOR circuit comprises: a differential amplifier having an input forming the RF input of the mixer and first and second differential outputs; a first diode having an anode terminal connected to the first differential output and a cathode terminal forming the LO input of the mixer; a second diode having a cathode terminal connected to the second differential output and an anode terminal connected to the LO input; a third diode having an anode terminal connected to the LO input and a cathode terminal connected to the IF output of the mixer; and a fourth diode having a cathode terminal connected to the input and an anode terminal connected to the IF output.