Compensation of skew passband of a SAW filter using predistortion
Abstract
A predistortion design by using a variable-track transducer with the interval of the same number of cycles is presented to compensate for the skew passband of a SAW filter. Three types of filters designed and manufactured with two types of substrates are introduced. Experimental results before and after compensation demonstrate that this is a simple and effective method of compensation design. Data on three types of filters made of the substrate materials, a transducer side lobe, and characteristics before and after compensation are tabulated. The expected and actual rectangular frequency responses; simulation of the distortion response and mathematical description of the compensation design; and the design structure of devices used in experiments are illustrated. Photos show: the passband characteristics and passband response of two filters before and after compensation, overall frequency response of another filter, and forked transducer.
- Publication:
-
China Rept Sci Technol JPRS CST
- Pub Date:
- March 1985
- Bibcode:
- 1985ChRST.......91H
- Keywords:
-
- Bandpass Filters;
- Instrument Compensation;
- Skewness;
- Surface Acoustic Wave Devices;
- Transducers;
- Dynamic Response;
- Frequencies;
- Mathematical Models;
- Substrates;
- Electronics and Electrical Engineering