Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1992-09-28
1994-02-01
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341153, 341154, H03M 168
Patent
active
052835804
ABSTRACT:
A digital-to-analog converter (10) uses series-connected resistors (55-59) to implement conversion of most significant bits of a digital input signal to an equivalent analog output signal. Current sources (22-26) are used to implement conversion of least significant bits of the digital input signal to the analog output signal. After making a binary-to-thermometer code conversion of the least significant bits, first logic circuitry (70) provides control signals (SI) for controlling the switching of each of the current sources to either a first (42) or a second (44) node. After making a binary to `one of` code conversion of the most significant bits, second logic circuitry (86) provides control signals (SR) for respectively switching the first and second nodes to any two resistor nodes of the resistors. The resistors are connected between a reference voltage terminal and a third node where the analog output signal is developed.
REFERENCES:
patent: 4491825 (1985-01-01), Tuthill
patent: 4581600 (1986-04-01), Ito et al.
patent: 4873525 (1989-10-01), Iida
Brooks Todd L.
Jackson H. Spence
Rybicki Mathew A.
King Robert L.
Motorola Inc.
Williams Howard L.
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