IMPROVING LINEARITY OF PHASE INTERPOLATORS BY COMBINING CURRENT CODING AND SIZE CODING

• Main Authors: KONG, Xiaohua, CHEN, Zhiqin, ARCUDIA, Kenneth Luis, SUN, Li, ZHU, Zhi
• Format: Patent
• Language: English; French; German
• Published: 12.04.2017
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

A phase interpolator, including: a first portion including a first plurality of branches and a plurality of tail current sources, each branch including a differential pair of transistors, source terminals of the differential pair of transistors connect to form a source node, wherein each tail current source couples to one of the source nodes, and wherein the differential pair of transistors and the corresponding tail current source are configured in a current coding scheme; a second portion including a second plurality of branches and a fixed current source coupled to the second plurality of branches, each branch of the second plurality of branches including a second plurality of differential pairs of transistors and a plurality of switches configured in a size coding scheme; wherein the first portion and the second portion are coupled to each other and to a pair of load resistors.