| CPC H01P 5/18 (2013.01) [H03F 3/19 (2013.01)] | 20 Claims |
|
1. A system, comprising:
a first amplifier configured to couple to an antenna;
a first mixer and a second mixer coupled to the first amplifier;
a local oscillator;
a quadrature signal generation sub-circuit coupled to the first mixer, the second mixer, and the local oscillator;
a second amplifier coupled to the first mixer;
a third amplifier coupled to the second mixer;
a first analog-to-digital converter (ADC) coupled to the first amplifier; and
a second ADC coupled to the second amplifier;
wherein the quadrature signal generation sub-circuit comprises:
a first conductive strip of a first width and a first length arranged in a first layer of an interconnect of a substrate; and
a second conductive strip of a second width and a second length arranged in a second layer of the interconnect;
wherein the first conductive strip and the second conductive strip are arranged in parallel with respect to each other in respective layers of the interconnect such that the first conductive strip and the second conductive strip form a directional coupler;
wherein the first conductive strip includes a first end configured to couple to the local oscillator and a second end opposite relative to the first end;
wherein the second conductive strip includes a third end configured to couple to the first mixer and electromagnetically coupled to the first end and a fourth end opposite relative to the third end;
wherein the first length of the first conductive strip and the second length of the second conductive strip are based on a quarter-wavelength of a center frequency of a bandwidth of the directional coupler; and
wherein the first width of the first conductive strip and the second width of the second conductive strip are selectively chosen based on a coupled gain between the first end and the third end of the directional coupler, wherein a desired coupled gain is greater than a throughput gain between the first end and the second end of the first conductive strip.
|