http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-100259442-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0a6a69da5879eb83f56f6876dba3e3cf |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03F3-2175 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03F3-245 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03F3-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04B1-04 |
| filingDate | 1995-12-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2000-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_df2b58792be12db5d69d17f4afbd8cc3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_eace7448b76c421090c2579d1001cc61 |
| publicationDate | 2000-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-100259442-B1 |
| titleOfInvention | Power Amplifiers for Wireless Telephone Transmitters |
| abstract | BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile wireless communication system including a cellular telephone operable by both analog modulation and digital modulation, wherein a single power amplifier circuit is used as both analog modulation and digital modulation. It is an object of the present invention to provide a power amplifier for a radiotelephone transmitter that can simultaneously realize high added efficiency in the case of a log modulation scheme and low adjacent channel leakage power in a digital modulation scheme. In the dual mode wireless telephone transmitter adopting the FDMA method and the CDMA method as the digital modulation access method, two types of DC power supply voltage Vdd applied to the power amplifier circuit 5 are provided according to each modulation method. By step-down conversion to voltage, the input / output characteristics of the power amplifier circuit 5 are controlled. For this reason, the microprocessor 3 is applied so that 4.6 V is applied to the power amplifier circuit 5 as Vdd in the case of the FDMA system, and 5.0 V is applied to the power amplifier circuit 5 as Vdd in the case of the CDMA system. The operation of the regulator 2 connected to the electrostatic source 1 is controlled. The DC bias voltage Vgg of the power amplifier circuit 5 is fixed at -3.5V. |
| priorityDate | 1995-07-13-04:00^^<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/SID410553718 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID13652349 |
Total number of triples: 17.