Patent ID: 7974589
Filing Date: 2011-07-05
Classification: H04L

Abstract:
1. A signal converter to provide output data streams through transmission lines each having a predetermined impedance, comprising: analog-to-digital converters to each provide parallel digital data in response to an analog input signal; a serializer arranged to convert the parallel digital data of each of said converters to a respective one of digital data streams; data transmitters each arranged to transmit a respective one of said data streams wherein each of said transmitters includes: first and second current sources; a third complementary common-source stage coupled between said first and second current sources and having third coupled gates and third coupled drains; a fourth complementary common-source stage coupled between said first and second current sources and having fourth coupled gates and fourth coupled drains; wherein said third coupled drains are coupled to drive said first coupled gates and said fourth coupled drains are coupled to drive said second coupled gates; and wherein said third and fourth coupled gates are arranged to receive said respective data stream from said serializer; a respective one of said output data streams thereby provided across said first and second coupled drains to a respective one of said transmission lines; and further including: a control transmitter identical to each of said data transmitters and connected to receive one of the data streams of said serializer; a load resistor driven by said control transmitter; and a controller coupled to alter currents in first and second current sources in said control transmitter and in said data transmitters to thereby maintain a constant voltage across said load resistor.