Patent ID: 6271725
Filing Date: 2001-08-07
Classification: G11B,H03F,H04L

Abstract:
A transconductance circuit, comprising:a first and a second differential pair of transistors having transistors area ratios of 1:r and r:1, respectively, said first and second differential pairs of transistors having bases and collectors coupled to a differential input signal and to a load, respectively, said first and second differential pair of transistors providing a differential current output signal;a first pair of diodes having positive nodes coupled to each other, said first pair of diodes having negative nodes coupled to emitters of said first differential pair of transistors, said first pair of diodes having a diode area ratio of r:1; anda second pair of diodes having positive nodes coupled to each other, said second pair of diodes having negative nodes coupled to emitters of said second differential pair of transistors, said second pair of diodes having a diode area ratio of 1:r.