Coupler and chip

Abstract

Disclosed are a coupler and a chip including the same. The coupler includes: a first unit circuit connected between a first differential line pair and a single-ended line; a second unit circuit connected between a second differential line pair and the single-ended line; a plurality of transmission lines including a first group of transmission lines connected between the first differential line pair and a crossed differential line pair, and a second group of transmission lines connected between the second differential line pair and the crossed differential line pair; and an isolation resistor. The first unit circuit includes: a first transformer connected to the first differential line pair and the single-ended line; and a second-side capacitor. The second unit circuit includes: a second transformer connected to the second differential line pair and the single-ended line; and a second-side capacitor.