Input stage for an analog-to-digital converter and method of ope

Details Input stage for an analog-to-digital converter and method of ope Input stage for an analog-to-digital converter and method of ope

1997-02-03

1998-06-02

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, H03M 100

Patent

active

057607281

ABSTRACT:
An input stage (200) for use in a Sigma-Delta analog-to-digital converter (300) that utilizes a frequency independent impedance (202) in parallel with a frequency dependent impedance (210, 212). An analog input signal (Vin) is concurrently passed through both impedances to a terminal of an operational amplifier (208). A feedback reference (REF) from the A/D converter (316) is also coupled to the terminal of the op amp (208) via a second frequency independent impedance (204). The frequency dependent impedance (210, 212) enables amplification of the input signal at higher frequencies to boost signal-to-noise ratio at such frequencies. Thus, the frequency dependent impedance significantly improves signal-to-noise ratio in the Sigma-Delta converter, thereby avoiding any pre-filtering of the Sigma-Delta inputs.

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