Switched capacitor one-bit digital-to-analog converter

Details Switched capacitor one-bit digital-to-analog converter Switched capacitor one-bit digital-to-analog converter

1993-04-06

1994-06-21

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341150, H03M 302

Patent

active

053231589

ABSTRACT:
A switched capacitor one-bit digital-to-analog converter is preferably utilized in the feedback path of a sigma delta modulator. The one-bit digital-to-analog converter includes first and second capacitors, a first switching circuit for coupling charge from a reference source to the capacitors, and a second switching circuit for coupling charge from the capacitors to positive and negative outputs, such as the summing junction of an operational amplifier. The switches in the second switching circuit have a cross-coupled configuration and are controlled by data dependent control signals. The data dependent control signals are structured such that charge is coupled from the capacitors to the summing junction on both clock phases, regardless of the state of the data. As a result, the sizes of the capacitors can be reduced by a factor of two for the same charge transfer.

REFERENCES:
patent: 5150120 (1992-09-01), Yunus
patent: 5187482 (1993-02-01), Tiemann et al.
Ribner et al, "Biquad Alternatives for High-Frequency Switched Capacitor Filters", IEEE J. Solid-State Circuits, vol. SC-20, No. 6, Dec. 1985, pp. 1085-1095.
Senderowicz et al, "A Family of Differential NMOS Analog Circuits for PCM Codec Filter Chip", IEEE J. Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982, pp. 1014-1023.
Sarhang-Nejad et al, "A True 16-Bit 20KHz Multibit .SIGMA..DELTA. ADC With Digital Correction", IEEE 1992 Custom Integrated Circuits Conf., pp. 16.4.1-16.4.4.

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