Transmit noise reducer

摘要

A transmit drive circuit with high signal to noise and frequency agility. In one embodiment, a transmit circuit includes a digital to analog converter, an amplifier, and a signal to noise enhancer, the signal to noise enhancer being a nonlinear passive device that attenuates low-power signals while transmitting high power signals with little loss. The signal to noise enhancer may be fabricated as a thin film of yttrium iron garnet (YIG) epitaxially grown on a gadolinium gallium garnet (GGG) substrate, the GGG substrate secured to a microwave transmission line from the input to the output of the signal to noise enhancer, such that the thin film of yttrium iron garnet is close to the transmission line.

主权项

1. A transmit system, comprising:
a digital-to-analog converter (DAC) having a digital input and an analog output; a first amplifier, having an input and an output, the input of the first amplifier being connected to the analog output of the DAC; a first signal-to-noise enhancer (SNE) having an input and an output, the input of the first SNE being connected to the output of the first amplifier, a second amplifier, having an input and an output, the input of the second amplifier being connected to the first SNE; and a second SNE having an input and an output, the input of the second SNE being connected to the output of the second amplifier, wherein each of the first SNE and second SNE comprising:
a microwave transmission line connected between the input and the output of the first SNE;a magnetic component capable of supporting magneto static waves, the magnetic component secured in proximity to the microwave transmission line;one or more magnets secured in proximity to the magnetic component; the first SNE having the characteristic of allowing a signal to propagate from the input of the first SNE to the output of the first SNE:
with a first attenuation when the power of the signal at the input of the SNE is less than a first threshold, andwith a second attenuation when the power of the signal at the input of the SNE is greater than a second threshold, the first attenuation exceeding the second attenuation by at least 5 decibels (dB).