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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7116955 | Dual loop automatic gain control An AGC circuit includes both wide-band and narrow-band VGAs. Two power monitors monitor the power level of the two VGAs. Based upon the signals provided by the power monitors, the AGC circuit derives two error terms. The AGC circuit filters and combines the error te... | 10/03/2006 |
| 7050774 | AGC circuit of an FM receiver that reduces interference while maintaining high reception sensitivity A first AGC voltage and a second AGC voltage are taken from the final stage of a radio-frequency circuit and the output side of a bandpass filter, respectively, and the gain of the radio-frequency circuit is controlled on the basis of the two AGC voltages. The pass-... | 05/23/2006 |
| 6725030 | CMOS radio frequency amplifier with inverter driver A MOSFET amplifier includes a pre-amplifier stage and a power amplifier stage. The pre-amplifier is a CMOS inverter having a signal output that is DC connected to the gate of a MOS control transistor of the power amplifier stage. The CMOS inverter includes an NMOS t... | 04/20/2004 |
| 6658243 | High frequency power amplifying apparatus having amplifying stages with gain control signals of lower amplitudes applied to earlier preceding stages A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the out... | 12/02/2003 |
| 6333675 | Variable gain amplifier with gain control voltage branch circuit A variable gain amplifier includes multiple unit variable gain amplifiers connected in series which amplify an input signal in accordance with their respective gains and generate a multi-stage amplified signal. A gain control circuit generates voltage con... | 12/25/2001 |
| 6108567 | Radio communication apparatus having a hands-free communication mode A communication apparatus of the present invention has a hands-free communication capability and is applicable to, but not limited to, a motor vehicle. Only if the apparatus is connected to, e.g., an on-board cigar-lighter, hands-free communication can be... | 08/22/2000 |
| 6037999 | Tuner for receiving television signal A television signal receiving tuner comprises a variable attenuating circuit for attenuating an inputted television signal and outputting the attenuated signal, a preamplifying circuit for amplifying the attenuated signal outputted from the variable atten... | 03/14/2000 |
| 6032031 | Receiver for suppressing intermodulation In a receiver used in radio communication, when two or more interfering waves having different frequencies exist (other than a received signal frequency), a deterioration of a receiving sensitivity by a cross modulation signal produced by a non-linearity ... | 02/29/2000 |
