http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3588708-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b312503d5fb78f9d7d78c88940a1558c |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03K5-1565 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03K5-156 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-24 |
| filingDate | 1968-02-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1971-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2f26f5c8dd0c9070673ae102e433a72c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_470a9daad01c56f3f8ae4582258d7608 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_04212a96058ed12c87f5951c03b91182 |
| publicationDate | 1971-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-3588708-A |
| titleOfInvention | Square wave symmetry control circuit for use in magnetometer readout circuits |
| abstract | THE READOUT CIRCUIT COMPRISES IN SEQUENCE A LIMITER, A SQUARE WAVE SYMMETRY CONTROL CIRCUIT, A FREQUENCY DISCRIMINATOR AND A TRANSIENT SUPPRESSOR. THE FREQUENCY AND AMPLITUDE MODULATED SINUSOIDAL MAGNETOMETER SIGNAL IS TRANSLATED INTO SQUARE WAVES BY THE LIMITER. SINCE THE AMPLITADE MODULATION WOULD CAUSE THE SQUARE WAVES TO BE ASYMMETRICAL AND DEGRADE THE PERFORMANCE OF THE CIRCUIT, THE SQUARE WAVE SYMMETRY CONTROL CIRCUIT GENERATES AN ERROR SIGNAL WHICH IS USED TO ELIMINATE THE EFFECTS OF AMPLITUDE MODULATION. THE FREQUENCY DISCRIMINATOR PRODUCES AN OUTPUT SIGNAL WHICH VARIES IN ACCORDANCE WITH THE INPUT FREQUENCY FROM THE MAGNETOMETER. THIS OUTPUT SIGNAL WHEN PLOTTED AGAINST INPUT FREQUENCY COMPRISES A RAMP OR SAWTOOTH, WITH A PERIOD OF 1000 HZ., SUCH THAT THE SAWTOOTH REPEATS FOR EACH 1000 HZ INCREMENT OF INPUT FREQUENCY. A SECOND PHASE DETECTOR PRODUCES AN IDENTICAL SAWTOOTH OUTPUT SHIFTED IN FREQUENCY BY 500 HZ. WITH RESPECT TO THE FIRST. A LOGIC SWITCH SENSITIVE TO THE AMPLITUDE OF EACH OF THE SAWTOOTH WAVES SWITCHES THE FOLLOWING CIRCUITS BETWEEN THE FREQUENCY DISCRIMINATOR OUTPUTS TO AVOID SIGNAL DISTORTIONS WHICH DEVELOP AT THE TRANSITION POINTS OF THE SAWTOOTH WAVES. A TRANSIENT SUPPRESSOR PREVENTS TRANSIENTS FROM SATURATING THE FOLLOWING FILTER CIRCUITS WHEN DIFFERENT DC LEVELS EXIST ON THE DISCRIMINATOR OUTPUTS AT THE TIME OF SWITCHING. BY FEEDING BACK THE SIGNAL BEING MONITORED TO THE OUTPUT OF THE UNUSED CHANNEL OF THE FREQUENCY DISTRIMINATOR, THE SAME SIGNAL IS FORCED TO BE PRESENT ON BOTH CHANNELS WHEN SWITCHING TAKES PLACE. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4461962-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3721835-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3748599-A |
| priorityDate | 1968-02-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID419532576 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID15629 |
Total number of triples: 23.