Patent ID: 8049534
Filing Date: 2011-11-01
Classification: H03K,H04L

Abstract:
1. An apparatus comprising: a first feed-forward RC network that is controlled by a first portion of a differential input signal; a second feed-forward RC network that is controlled by a second portion of a differential input signal; a first NPN transistor that is coupled to the first feed-forward RC network at its collector, wherein the first NPN transistor is diode-connected; a second NPN transistor that is coupled to the second feed-forward network at its collector, wherein the second NPN transistor is diode-connected; a third NPN transistor that is coupled to the first NPN at its base, wherein the ratio of the size of the third NPN transistor to the size of the first NPN is N to 1, and wherein N is greater than 1; a fourth NPN transistor that is coupled to the second NPN transistor at its base, wherein the ratio of the size of the fourth NPN transistor to the size of the second NPN transistor is N to 1; a first output terminal that is coupled to the collector of the third NPN transistor; a second output terminal that is coupled to the collector of the fourth NPN transistor; and a current source that is coupled to the emitters of the first, second, third, and fourth NPN transistors.