Digital-to-analog converter using cyclical current source switch

Details Digital-to-analog converter using cyclical current source switch Digital-to-analog converter using cyclical current source switch

1990-05-03

1992-01-28

Pellinen, A. D.

Coded data generation or conversion

Converter compensation

341144, H03M 106

Patent

active

050847015

ABSTRACT:
A digital-to-analog (D/A) converter using cyclical current source switching to average out the errors in individual current sources. The D/A converter includes a current source switching circuit, a bank of constant current sources and a control circuit. The current source switching circuit, which is clocked by the control circuit, generates an upper and a lower pointer in accordance with a digital input signal. The upper pointer, which is advanced for an increasing digital input signal, connects current sources to an output bus. The lower pointer, which is advanced for a decreasing digital input signal, disconnects current source from the output bus. The upper and lower pointers continuously cycle through the bank of current sources to average out the errors in the individual current sources.

REFERENCES:
patent: 3982172 (1976-09-01), Van de Plassche
patent: 4125803 (1978-11-01), Van de Plassche
patent: 4492954 (1985-01-01), Harris et al.
patent: 4573005 (1986-02-01), Van de Plassche
patent: 4591828 (1986-05-01), Storey
patent: 4695826 (1987-09-01), Ando et al.
patent: 4703310 (1987-10-01), Van de Plassche
patent: 4791406 (1988-12-01), Mehrgardt et al.
L. Richard Carley and John Kenney, "A 16-Bit 4'th Order Noise-Shaping D/A Converter", IEEE Custom Integrated Circuits Conference, 1988, pp. 21.7.1-21.7.4.

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