THD Analyzer IC Suits RFID Reader Sub-Systems

Designed as a building-block component for the reader sub-system in multi-standard RFID systems based on frequency-division multiple access, the MSTHDA is a one-chip, 1.6-octave-wide, five-harmonic, THD analyzer. One master clock controls the center frequencies, which are set at the fundamental and the second through fifth harmonics. When clocked at 42.5 MHz, the fifth harmonic output is 3.4 MHz. The chip incorporates five six-pole bandbass filters, an uncommitted op amp, a digitally controlled gain stage, an analog-controlled gain stage, and three selectable power modes: power down, low power, and high power. It operates from a single power supply in a range of 3.3 to 5.5 Vdc. Other application areas for the device include real-time distortion analysis, audio and ultrasonic analysis, and vibration analysis. The MSTHDA comes in a 16-pin plastic SOIC package. It’s available now for $9.90 each/1,000. MIXED SIGNAL INTEGRATION, San Jose, CA. (408) 434-6305.