Patent ID: 7860407
Filing Date: 2010-12-28
Classification: H04B

Abstract:
1. A circuit for providing pre-emphasis comprising: a first input node configured to receive a first data signal; a second input node configured to receive a second data signal that is the complementary of the first data signal; an adjustable delay stage having a first node coupled to the first input node and a second node coupled to the second input node, wherein the adjustable delay stage is configured to at least partially produce a delay in the first and/or second data signals to thereby generate a first delayed signal and/or second delayed signal; a pulse generation stage having a first node coupled to a third node of the adjustable delay stage and a second node coupled to a fourth node of the adjustable delay stage and having a third node coupled to the first input node and a fourth node coupled to the second input node, wherein the pulse generation stage is configured to generate a first pulse signal from the first delayed signal and the first data signal and/or produce a second pulse signal from the second delayed signal and the second data signal; a first output node coupled to a fifth node of the pulse generation stage configured to output the first pulse signal; and a second output node coupled to a sixth node of the pulse generation stage configured to output the second pulse signal, wherein the adjustable delay stage includes a first current source that is adjustable to increase the delay and a second current source that is adjustable to decrease the delay.