A Fast Settling HBT Reference Amplifier for High Speed Digital-to-Analog Converters

Authors:
Yihong Dai;Donald T. Comer;David J. Comer
Affiliations:
Department of Electrical and Computer Engineering, Brigham Young University, Provo, USA UT 84602;Department of Electrical and Computer Engineering, Brigham Young University, Provo, USA UT 84602;Department of Electrical and Computer Engineering, Brigham Young University, Provo, USA UT 84602
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2005

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Abstract

This paper proposes a fast settling reference amplifier for use with a current-steering Digital-to-Analog Converter (DAC). The reference amplifier utilizes an open loop architecture, resulting in a bandwidth of 2.5 GHz, small chip area and low power. The wide bandwidth of the reference amplifier is shown to be important for fast settling of DAC current output. The reference amplifier is also able to generate a reference current that tracks fast changes of reference voltage, thus is useful in applications such as multiplying DACs and transversal filters. The proposed design was fabricated using a 1 驴m GaAs HBT process. The prototype reference amplifier achieves a temperature coefficient of 92 ppm/°C over a temperature range of 0--100°C and the reference current changes only 卤2.14% when the power supply varies 卤0.2 V.