| Presentation | 1997/1/24 A 1.9-GHz Si-Bipolar Variable Attenuator for PHS Transmitter Shoji Otaka, Hiroshi Tanimoto, Shuji Watanabe, Tadahiko Maeda, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A 4-dB step 28-dB variable attenuator for a 1.9-GHz PHS transmitter was fabricated using Si-bipolar technology. A conventional IF variable amplifier for a receiver was improved to produce an RF band attenuator as follows. The buffer circuits for the impedance converter were removed in each attenuation switchable stage because load resistors of a few hundred ohms were sufficient for the attenuator. This indicates that the attenuator operates in low power consumption. Moreover, a novel attenuation switchable stage configuration to reduce parasitic capacitance limiting the maximum attenuation level was introduced. A maximum attenuation of over 28dB, an attenuation accuracy within 1.2dB, and a vector modulation error of less than 4% were obtained by measurement. The attenuator consumes 21mA with 2.7V supply voltage and occupies an area measuring 1.1mm×0.5mm. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Variable attenuator / Vector modulation error / Bipolar transistor / Transmitter / PHS |
| Paper # | ED96-198,MW96-161,IDC96-186 |
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| Conference Information | |
| Committee | ED |
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| Conference Date | 1997/1/24(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Assistant | |
| Paper Information | |
| Registration To | Electron Devices (ED) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A 1.9-GHz Si-Bipolar Variable Attenuator for PHS Transmitter |
| Sub Title (in English) | |
| Keyword(1) | Variable attenuator |
| Keyword(2) | Vector modulation error |
| Keyword(3) | Bipolar transistor |
| Keyword(4) | Transmitter |
| Keyword(5) | PHS |
| 1st Author's Name | Shoji Otaka |
| 1st Author's Affiliation | R&D Center, Toshiba Corp.() |
| 2nd Author's Name | Hiroshi Tanimoto |
| 2nd Author's Affiliation | R&D Center, Toshiba Corp. |
| 3rd Author's Name | Shuji Watanabe |
| 3rd Author's Affiliation | LSI Division, I, Semiconductor Group, Toshiba Corp. |
| 4th Author's Name | Tadahiko Maeda |
| 4th Author's Affiliation | R&D Center, Toshiba Corp. |
| Date | 1997/1/24 |
| Paper # | ED96-198,MW96-161,IDC96-186 |
| Volume (vol) | vol.96 |
| Number (no) | 462 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |