Analog-to-digital converter and method of fabrication

Details Analog-to-digital converter and method of fabrication Analog-to-digital converter and method of fabrication

1991-10-30

1994-11-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

341155, 341156, 327100, H03M 100

Patent

active

053693094

ABSTRACT:
A two-step analog-to-digital converter and BiCMOS fabrication method. The fabrication method provides pseudosubstrate isolation of digital CMOS devices from the analog devices. The converter uses NPN current switching in a flash analog-to-digital converter and in a digital-to-analog converter for low noise operation. CMOS digital error correction and BiCMOS output drivers provide high packing density plus large output load handling. Timing control aggregates switching events and puts them into intervals when noise sensitive operations are inactive. The fabrication method uses a thin epitaxial layer with limited thermal processing to provide NPN and PNP devices with large breakdown and Early voltages. Laser trimmed resistors provide small long term drift due to dopant stabilization in underlying BPSG and low hydrogen nitride passivation.

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patent: 4908621 (1990-03-01), Polonio et al.
patent: 4973976 (1990-11-01), Lee et al.
patent: 5070332 (1991-12-01), Kaller et al.

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