| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9fc0a00eab3a757e8324b1e887d7ba97 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D2200-0096
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D2200-0009
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D2200-0039
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D2200-0082 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D3-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03D3-02 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03D3-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03D3-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03D3-20 |
| filingDate |
1985-09-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1991-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4967cecb179dd034809f410f3baa971e
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7da815214d0630b2027754f478da94d7 |
| publicationDate |
1991-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-1282843-C |
| titleOfInvention |
Inductorless active filter phase shift demodulator |
| abstract |
ABSTRACT An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quadrature signal in an EXCLUSIVE OR gate (24) and then low pass filtered (36) to obtain recovered audio. The active filter (26) includes a transconductance amplifier (60) whose center frequency can be adjusted by appropriate adjustment of the amplifier's bias current. The bias current is temperature compensated to allow operation of the demodulator over a wide temperature range. |
| priorityDate |
1984-10-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |