Analog-Digital converter using delta sigma modulation digital fi

Details Analog-Digital converter using delta sigma modulation digital fi Analog-Digital converter using delta sigma modulation digital fi

1995-09-26

1998-05-26

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341172, H03M 302

Patent

active

057572992

ABSTRACT:
An analog-digital converter comprises a .DELTA. .SIGMA. modulator, a digital filter, a high-pass filter and a multiplier which are connected in series. Analog input is converted into serial-bit strings by the .DELTA. .SIGMA. modulator, for which gain `1/A` is set. The digital filter extracts low-frequency components, corresponding to the analog input, from the serial-bit strings, so the low-frequency components are converted into parallel-bit digital data. The high-pass filter removes DC offset component from output of the digital filter; and then, output thereof is multiplied by scaling gain `A` by the multiplier so that digital output is produced. The .DELTA. .SIGMA. modulator comprises at least three switched-capacitor integrators and a one-bit quantizer, which are connected in series, as well as a one-sample delay circuit. One-bit output, produced by the one-bit quantizer, is delayed by the one-sample delay circuit, whose output is delivered to each switched-capacitor integrator. Each switched-capacitor integrator is configured using a CMOS differential amplifier which is configured by a CMOS operational amplifier and at least one amplitude-limiting circuit. The amplitude-limiting circuit is configured by two PMOS transistors and two NMOS transistors which are connected in parallel in a diode-connection manner; and this circuit is provided to limit amplitude in output of the CMOS differential amplifier by stabilizing its operating point.

REFERENCES:
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patent: 5283578 (1994-02-01), Ribner et al.
patent: 5311181 (1994-05-01), Ferguson, Jr. et al.
patent: 5392043 (1995-02-01), Ribner

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