Ultra fast digital-to-analog converter with independent bit curr

Details Ultra fast digital-to-analog converter with independent bit curr Ultra fast digital-to-analog converter with independent bit curr

1989-01-31

1990-09-18

Shoop, Jr., William M.

Coded data generation or conversion

Converter calibration or testing

341118, 341144, H03M 110, H03M 106

Patent

active

049581554

ABSTRACT:
Ultra fast high resolution digital-to-analog converter converts input code into a corresponding output current or voltage. The individual currents are continuously adjusted and coupled to an output via switches. Resistors can have two values. On-resistances of any switches and values of capacitors are insignificant. No transistor matching is necessary, wherein FETs are preferred.
Current sources provide currents in a response to base signals stored in the capacitors. The resistors conduct the currents and switches couple the currents to the output in response to the input code. A reference circuit provides a reference code and reference signal corresponding thereto. A multiplexer selects a voltage appearing across one of the resistors, in response to the reference code. A comparator compares the selected voltage against reference signal and provides a corrective signal. A demultiplexer applies the corrective signal to one of the capacitors in response to the reference code.

REFERENCES:
patent: 4222107 (1980-09-01), Mrozowski et al.
patent: 4340882 (1982-07-01), Maio et al.
patent: 4405916 (1983-09-01), Hornak et al.
patent: 4565961 (1986-01-01), Hornak et al.
patent: 4591828 (1986-05-01), Storey
patent: 4607250 (1986-08-01), Naylor et al.
patent: 4835535 (1989-05-01), Shibayama

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