A charge-transfer multiplying digital-to-analog converter

A new charge-transfer multiplying digital-to-analog converter employs an array of binary-weighted MOS capacitors and MOS transistors as its only elements. It can be fabricated on the same chip and by the same process as most charge-coupled devices and bucket-brigade devices, and provides two- or four-quadrant multiplication. An experimental n-channel metal-gate MOS realization demonstrated accuracy to 7 bits plus sign, total harmonic distortion 60 dB below fundamental, 70 dB dynamic range, and 200 kHz bandwidth.