Patent ID: 8369820

Claim:
A frequency multiplier device, comprising: a first signal combiner having a first port for receiving a first input signal having a first frequency f 1 and a second port for receiving a second input signal having a second frequency f 2 , the first signal combiner configured to provide an output signal having either a sum of the first frequency and second frequency or a difference of the first frequency and second frequency; and a frequency divider having a dividing ratio N, the frequency divider configured to output a divided signal, wherein the output signal from the first signal combiner is coupled to the frequency divider, the divided signal from the frequency divider is coupled to the second port of the first signal combiner, and the output signal from the first signal combiner has a frequency of (N/(N±1))×f 1 , further comprising a second signal combiner having a first port for receiving a third input signal having a third frequency f 3 and a second port for receiving a fourth input signal having a fourth frequency f 4 , the second signal combiner configured to provide an output signal having either a sum of the third frequency and fourth frequency or a difference of the third frequency and fourth frequency, wherein the output from the first signal combiner is coupled to the second port of the second signal combiner and the output from the second signal combiner is coupled to the first port of the first signal combiner, and wherein, when the first signal combiner provides the output signal having the difference of the first frequency and the second frequency and the second signal combiner provides the output signal having the sum of the third frequency and fourth frequency, the output signal from the second signal combiner has a frequency of (N+1)×f 3 .