Low-noise transmitter system and method

Details Low-noise transmitter system and method Low-noise transmitter system and method

2007-09-25

2007-09-25

Vo, Nguyen T. (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S127100

Reexamination Certificate

active

10927311

ABSTRACT:
A low-noise transmitter architecture and method for high linearity, high output-swing systems such as Asymmetrical Digital Subscriber Line (ADSL) systems. The transmitter uses a switched-current DAC having a current source coupled to ground, followed by a resistive transimpedance amplifier (TIA). The resistance of the current source is typically large enough so that noise from an op-amp included in the TIA is not significantly amplified at the output. The current source may be passive and may include at least one resistor connected to ground. With a passive current source, portions of a signal output by the DAC enter either the current source or the resistive transimpedance amplifier, but not both, eliminating noise in the system produced by the current source.

REFERENCES:
patent: 5640128 (1997-06-01), Wilhelm
patent: 6188498 (2001-02-01), Link et al.
patent: 2003/0160171 (2003-08-01), Parrish et al.

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