Successive approximation analog to digital converter

Details Successive approximation analog to digital converter Successive approximation analog to digital converter

1984-06-19

1986-06-03

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03N 138

Patent

active

045932700

ABSTRACT:
An analog-to-digital converter is used in conjunction with a digital to analog converter and a comparison network to provide a group of digital signals that, when applied to a digital-to-analog converter, produce an output signal approximating an applied input signal. The analog-to-digital converter includes a clock circuit, a series of bistable multivibrator circuits, a master latch circuit, a plurality of slave latch circuits, and associated logic circuits. The bistable multivibrators are arranged to produce a sequence of activation signals in response to operation of the clock circuit. The activation signals serve to place slave latches circuits sequentially in a positive logic status temporarily, each slave latch output terminal being associated with a binary signal of decreasing significance in approximating the applied input signal. The output signal of the digital-to-analog converter is compared with the applied input signal. A signal resulting from the comparison of these signals is applied through the master latch circuit to the activated slave latch circuit and this comparison signal determines whether a positive or negative logic signal is latched at the output terminal of the slave latch circuit. The multivibrator circuits then activate the next slave latch circuit in sequence until the last slave latch circuit is activated. The analog-to-digital converter is implemented in current mode (steering mode) logic and compatible components to permit the circuit to be fabricated on a single chip.

REFERENCES:
patent: 4454500 (1984-06-01), Kato et al.

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