Programmable attenuator using digitally controlled CMOS...

Details Programmable attenuator using digitally controlled CMOS... Programmable attenuator using digitally controlled CMOS...

2006-10-27

2010-02-09

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C333S08100R

Reexamination Certificate

active

07660571

ABSTRACT:
A programmable attenuator includes a resistor ladder having a plurality of taps to provide a coarse gain control. Coupled to each tap is a plurality of switches. Control logic activates or deactivates individual switches in the plurality of switches to provide a fine gain control. More specifically, a set of activated switches provides fine gain control by determining an overall attenuation level interpolated between an adjacent pair of taps.

REFERENCES:
patent: 6285865 (2001-09-01), Vorenkamp et al.
patent: 6549763 (2003-04-01), Imai et al.

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