Title :
A CMOS pulse-width modulator/pulse-amplitude modulator for four-quadrant analog multipliers
Author :
De Cock, Bart A. ; Maurissens, Danny ; Cornelis, Jan
Author_Institution :
Vrije Univ., Brussels, Belgium
fDate :
9/1/1992 12:00:00 AM
Abstract :
A CMOS pulse-width modulator/pulse-amplitude modulator (PWM/PAM) has been designed using the Tomota-Sugiyama-Yamaguchi principle. The PWM/PAM has been used to build a four-quadrant analog multiplier (4-QAM) with a DC transfer function that depends only on resistor matching and on the value of a reference voltage. The PWM/PAM circuit was fabricated in a 3-μm CMOS process; measurements show a small total error (maximum 2% of full scale) without trimming, a high temperature stability (±6 ppm/°C), and a low supply voltage sensitivity (±25 ppm/%). The total harmonic distortion of the PWM is less than 0.05% (measured for a clock frequency of 200 kHz). Analytic design equations include a DC error model, a stability criterion, and the relation between the maximum bandwidth and the clock frequency
Keywords :
CMOS integrated circuits; analogue computer circuits; linear integrated circuits; modulators; multiplying circuits; pulse amplitude modulation; pulse width modulation; 200 kHz; 3 micron; CMOS process; DC error model; DC transfer function; Tomota-Sugiyama-Yamaguchi principle; clock frequency; design equations; four-quadrant analog multipliers; maximum bandwidth; pulse-amplitude modulator; pulse-width modulator; reference voltage; resistor matching; stability criterion; supply voltage sensitivity; temperature stability; total harmonic distortion; Clocks; Distortion measurement; Frequency; Pulse modulation; Pulse width modulation; Quadrature phase shift keying; Resistors; Space vector pulse width modulation; Transfer functions; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
