Interpolating programmable gain attenuator

Details Interpolating programmable gain attenuator Interpolating programmable gain attenuator

2007-07-10

2007-07-10

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Attenuators

C330S284000, C327S308000

Reexamination Certificate

active

10830112

ABSTRACT:
A programmable gain attenuator includes a termination resistor. A first termination switch connects one side of the termination resistor to a first output. A second termination switch connects another side of the termination resistor to a second output. A first resistor ladder is arranged between a first input and the first side of the termination resistor. A first plurality of switches connect a corresponding tap from the first resistor ladder to the first output. A second resistor ladder is arranged between a second input and the second side of the termination resistor. A second plurality of switches connect a corresponding tap from the second resistor ladder to the second output. A first switch of the first plurality of switches is turned on, followed by a second switch of first plurality of switches turned off, followed by a third switch of first plurality of switches turned on. A first switch of the second plurality of switches is turned on, followed by a second switch of second plurality of switches turned off, followed by a third switch of second plurality of switches turned on.

REFERENCES:
patent: 6175278 (2001-01-01), Hasegawa
patent: 6472940 (2002-10-01), Behzad et al.
patent: 6545620 (2003-04-01), Groeneweg
patent: 2005/0093643 (2005-05-01), Westra et al.
patent: 2005/0168279 (2005-08-01), Behzad

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