FIELD: communications engineering.
SUBSTANCE: proposed device has sections 1 identical in structure and built around operational amplifier 3 with negative feedback circuits 4, 5 and with piezoelectric resonator 6. Outputs of sections are connected to respective inputs of adder 2 built around operational amplifier 8 and resonators 9 - 12. Each operational amplifier 3 has output-stage current control lead connected to outputs of control unit 14. Operational amplifiers 3 whereto control current is not supplied from output stage are at high-impedance state in which they do not influence operation of other sections thereby affording high degree of channel-to-channel isolation.
EFFECT: simplified design of digital central frequency tunable filter.
1 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ACTIVE BAND-PASS PIEZOELECTRIC FILTER | 1999 |
|
RU2168852C2 |
| MULTI-CHANNEL ACTIVE PIEZOELECTRIC FILTER | 2009 |
|
RU2397609C1 |
| ACTIVE PIEZOELECTRIC REJECTION FILTER | 0 |
|
SU1801247A3 |
| ACTIVE BROAD-BAND PIEZOELECTRIC FILTER | 1998 |
|
RU2137291C1 |
| ACTIVE PIEZOELECTRIC REJECTION FILTER | 2002 |
|
RU2236082C2 |
| BROADBAND MULTICHANNEL PIEZOELECTRIC FILTERING DEVICE | 2005 |
|
RU2296418C1 |
| ACTIVE BROADBAND PIEZOELECTRIC FILTER | 2001 |
|
RU2190923C1 |
| PIEZOELECTRIC ACTIVE BAND FILTER | 2001 |
|
RU2190294C1 |
| ACTIVE POLAR PIEZO-ELECTRIC FILTER | 2005 |
|
RU2307461C2 |
| ACTIVE BAND-PASS PIEZOELECTRIC FILTER | 2000 |
|
RU2168850C1 |
