Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1993-04-30
1995-03-28
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341133, H03M 178
Patent
active
054021260
ABSTRACT:
A method and apparatus is provided for accurate digital to analog conversion in which bipolar voltage switches are used in a GaAs I.sup.2 L integrated circuit. An architecture is provided that includes an R-2R resistor ladder network formed in a GaAs I.sup.2 L integrated circuit. A compound transistor pair (Q1, Q2) is connected to each leg (2R) of the ladder network in a digital to analog converter (110). Each transistor pair (Q1, Q2) is configured as a single-pole-double-throw voltage bit switch (100). The transistor pair switches the shunt (2R) resistors between two, alternative voltage levels (Vb, circuit "ground"), based on the state of the binary input logic signal (Ai). Each switch and respective leg in the ladder network relates to a corresponding bit position (Ai) in the input signal. A matched pair of diodes (D2, D3) are used to clamp the voltages to be selected by the bit switch (100) to a predetermined voltage level, thus regulating the voltages switched out to the ladder network and increasing the switching speed of the converter.
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Donaldson Richard L.
Hoel Carlton H.
Hoff Marc S.
Stoltz Richard A.
Texas Instruments Incorporated
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