Gain control in a signal path with sigma-delta...

Details Gain control in a signal path with sigma-delta... Gain control in a signal path with sigma-delta...

2007-09-11

2007-09-11

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

10977010

ABSTRACT:
Automatic gain control is provided in a sigma-delta analog-to-digital converter. The automatic gain control is entirely or partly provided by an amplifier and an attenuator within the sigma-delta analog-to-digital converter. The amplifier within the sigma-delta time continuous loop prior to quantization and an attenuator in the feedback prior to summation with incoming signals. Scaling within the sigma-delta analog-to-digital converter results in lower current requirements for automatic gain control without disturbing or minimizing disturbance of the stability of a sigma-delta topology. By providing at least part of the automatic gain within the analog-to-digital converter, the specifications or requirements of the LNA or baseband amplifiers may be reduced or limited.

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