Patent ID: 8395456
Filing Date: 2013-03-12
Classification: H03B,H03F,H03G,H03H

Abstract:
1. A variable phase amplifier circuit comprising: a phase splitter circuit, wherein the phase splitter circuit generates a first and a second differential signal pair in response to receiving an input differential signal pair, and wherein: a first variable gain amplifier circuit coupled to the phase splitter circuit, wherein the first variable gain amplifier circuit comprises: a second variable gain amplifier circuit coupled to the phase splitter circuit, wherein the second variable gain amplifier circuit scales the second differential signal pair by a second scale factor in response to receiving the second differential signal pair; and a summation circuit coupled to the first and the second variable gain amplifier circuits, wherein the summation circuit receives a first and a second scaled differential signal pair from the first and the second variable gain amplifier circuits respectively, and outputs a modified differential signal pair in response; wherein a phase of the modified differential signal pair is a function of the first scale factor, and wherein the summation circuit sums a first end of the first scaled differential signal pair to a first end of the second scaled differential signal pair, and wherein the summation circuit sums a second end of the first scaled differential signal pair to a second end of the second scaled differential signal pair.