Teledyne Scientific and Imaging, LLC

Munkyo Seo

Myung-Jun Choe

Kang-Jin Lee

A 'multiple return-to-zero' (MRZ) current switching DAC. In operation, the outputs of respective current sources are selectively directed to respective intermediate nodes in response to respective control signals which vary with a digital input word, and in synchronization with a clock CK1. A plurality of MRZ current switches are connected between respective intermediate nodes and the DAC's analog output. The MRZ switches are driven with a clock CK2 which toggles in synchronization with CK1 at a frequency f=N*f. The MRZ switches are operated such that switching noise that arises when CK1 is asserted is prevented from appearing on the analog output. When properly arranged, the DAC can generate a direct digital waveform at RF frequencies, with N chosen to produce an output spectrum such that the DAC's output power is relatively high within the desired frequency range.

Multiple return-to-zero current switching digital-to-analog converter for RF signal generation

The present invention relates generally to a digital-to-analog converter (DAC) calibration. The present invention may be implemented by a DAC calibration system including a first current source, a first switch coupled to the first current source, a second current source, a second switch coupled to the second current source, an output node coupled to the first switch and the second switch, a first calibration module coupled to the output node, an average current measurement module coupled to the first calibration module, and a second calibration module coupled to the average current measurement module.

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Thousand Oaks, CA, United States of America

Munkyo Seo