Title :
Heterojunction acoustic-charge-transport fixed-tap transversal filter
Author :
Merritt, Sears W. ; Tanski, William J. ; Cullen, Donald E. ; Sacks, Robert N. ; Branciforte, Emilio J. ; Carroll, Roger D. ; Peterson, Gerald A.
Author_Institution :
United Technol. Res. Center, East Hartford, CT, USA
fDate :
3/1/1990 12:00:00 AM
Abstract :
A heterojunction acoustic-charge-transport (HACT) transversal filter with a 3.35- mu s-long array of output electrodes is discussed. The device operated at an acoustic clock frequency of 143.6 MHz with a charge transfer efficiency in excess of 0.9999. The impulse response and swept frequency response of the device were nearly ideal. On the basis of measurements of the 1-dB compression point, the third-order intercept, and the noise floor of the device, a thermal dynamic range of 80 dB and a spurious free dynamic range of 62 dB were demonstrated over a 300-kHz bandwidth. The device exhibited 12 dB of gain when embedded in a 50- Omega system.<>
Keywords :
active filters; ohmic contacts; piezoelectric semiconductors; surface acoustic wave devices; 1-dB compression point; acoustic clock frequency; charge transfer efficiency; fixed-tap transversal filter; heterojunction acoustic-charge-transport; impulse response; noise floor; output electrodes; spurious free dynamic range; swept frequency response; thermal dynamic range; third-order intercept; Acoustic devices; Acoustic measurements; Charge transfer; Clocks; Dynamic range; Electrodes; Frequency response; Heterojunctions; Noise measurement; Transversal filters;
Journal_Title :
Electron Device Letters, IEEE
