Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1993-06-30
1995-09-05
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341135, 341154, H03M 166
Patent
active
054482380
ABSTRACT:
A digital to analog converter and method for conversion is provided that includes an R-2R resistor ladder network formed with a plurality of current bit switches in a GaAs HI.sup.2 L integrated circuit. Each bit switch and R-2R node in the ladder network is associated with a corresponding bit position in the binary signal input to the converter. An arrangement of bipolar transistors (Q1, Q4) and diodes (D2-D3) is included in each bit switch (100) that steers current through one of two alternate paths, based on the logic state of the binary input signal (i e., "high" or "low" state). For one logic state of the binary input signal, current flows through the switch from the output of the digital to analog converter (110). For the alternate signal state, current flow from the output of the digital to analog converter is blocked. Therefore, each bit switch (100) operates as a single-pole-double-throw current mode switch under the control of the binary input signal (Ai). An arrangement of bipolar transistors (Q2, Q4) and a diode (D1 ) is also included to limit voltage swings and compensate for switching transients, which speeds up the recovery time of the switch and increases the overall switching speed of the digital to analog converter.
REFERENCES:
patent: 4176344 (1979-11-01), Saari et al.
patent: 4758820 (1988-07-01), Tateno
Frederick G. Weiss, "A 1 Gs/s 8-Bit GaAs DAC With On-Chip Current Sources," IEEE GaAs IC Symposium, 1986, pp. 217-220.
Van Andrews, et al., "A Monolithic Digital Chirp Synthesizer Chip with I and Q Channels," IEEE Journal of Solid-State Circuits, vol. 27, No. 10, Oct., 1992, pp. 1321-1326.
Robert W. Meyer, et al., "A Monolithic GaAs DDS for a Digital Radio Application," Government Microcircuit Applications Conference 1992 Digest of Papers, vol. XVIII, Nov., 1992, pp. 431-434.
Donaldson Richard L.
Kesterson James C.
Skrehot Michael K.
Texas Instruments Incorporated
Williams Howard L.
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